Merge branch 'develop'

version bump
fix optimization issues in release build
2026-01-13 15:13:28 +01:00 · 2019-08-27 14:38:16 +09:00 · 2019-08-27 14:38:05 +09:00 · 2019-08-27 14:21:33 +09:00 · 2019-08-20 12:42:34 +09:00 · 2019-07-09 14:50:23 +09:00
612 changed files with 473580 additions and 5693 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ CoreStore.xcworkspace/xcuserdata
 .DS_Store
 DerivedData
 *.orig
+build
+Playground_macOS.playground/playground.xcworkspace/xcuserdata
--- a/.jazzy.yaml
+++ b/.jazzy.yaml
@@ -0,0 +1,15 @@
+author: John Estropia
+author_url: https://github.com/JohnEstropia
+github_url: https://github.com/JohnEstropia/CoreStore
+module: CoreStore
+readme: README.md
+include: Sources/*
+output: docs
+theme: fullwidth
+clean: true
+skip_undocumented: true
+xcodebuild_arguments:
+- -sdk
+- iphonesimulator
+- -scheme
+- CoreStore iOS
--- a/.swift-version
+++ b/.swift-version
@@ -1 +0,0 @@
-4.0
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode9
+osx_image: xcode10.2
 sudo: false
 git:
  submodules: false
@@ -10,31 +10,22 @@ env:
  - LC_CTYPE=en_US.UTF-8
  - LANG=en_US.UTF-8
  matrix:
-    - DESTINATION="OS=11.0,name=iPhone 8"          SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=10.3,name=iPhone 7"          SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=10.1,name=iPhone 7"          SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=9.0,name=iPhone 6 Plus"      SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.4,name=iPhone 6"           SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.3,name=iPhone 5S"          SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.3,name=iPhone 5"           SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.3,name=iPhone 4S"          SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="arch=x86_64"                    SCHEME="CoreStore OSX"     SDK=macosx10.13          RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=4.0,name=Apple Watch - 42mm" SCHEME="CoreStore watchOS" SDK=watchsimulator4.0    RUN_TESTS="NO"  POD_LINT="NO"
-    - DESTINATION="OS=3.2,name=Apple Watch - 42mm" SCHEME="CoreStore watchOS" SDK=watchsimulator4.0    RUN_TESTS="NO"  POD_LINT="NO"
-    - DESTINATION="OS=2.2,name=Apple Watch - 42mm" SCHEME="CoreStore watchOS" SDK=watchsimulator4.0    RUN_TESTS="NO"  POD_LINT="NO"
-    - DESTINATION="OS=11.0,name=Apple TV 1080p"    SCHEME="CoreStore tvOS"    SDK=appletvsimulator11.0 RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=10.2,name=Apple TV 1080p"    SCHEME="CoreStore tvOS"    SDK=appletvsimulator11.0 RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=9.2,name=Apple TV 1080p"     SCHEME="CoreStore tvOS"    SDK=appletvsimulator11.0 RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="arch=x86_64"                         SCHEME="CoreStore OSX"     SDK=macosx10.14          RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=12.0,name=iPhone XS"              SCHEME="CoreStore iOS"     SDK=iphonesimulator12.0  RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=11.0.1,name=iPhone 8"             SCHEME="CoreStore iOS"     SDK=iphonesimulator12.0  RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=10.3.1,name=iPhone 7"             SCHEME="CoreStore iOS"     SDK=iphonesimulator12.0  RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=10.1,name=iPhone 7"               SCHEME="CoreStore iOS"     SDK=iphonesimulator12.0  RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=4.0,name=Apple Watch - 42mm"      SCHEME="CoreStore watchOS" SDK=watchsimulator5.0    RUN_TESTS="NO"  POD_LINT="NO"
+    - DESTINATION="OS=3.2,name=Apple Watch - 42mm"      SCHEME="CoreStore watchOS" SDK=watchsimulator5.0    RUN_TESTS="NO"  POD_LINT="NO"
+    - DESTINATION="OS=2.2,name=Apple Watch - 42mm"      SCHEME="CoreStore watchOS" SDK=watchsimulator5.0    RUN_TESTS="NO"  POD_LINT="NO"
+    - DESTINATION="OS=12.0,name=Apple TV 4K"            SCHEME="CoreStore tvOS"    SDK=appletvsimulator12.0 RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=11.0,name=Apple TV 4K (at 1080p)" SCHEME="CoreStore tvOS"    SDK=appletvsimulator12.0 RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=10.2,name=Apple TV 1080p"         SCHEME="CoreStore tvOS"    SDK=appletvsimulator12.0 RUN_TESTS="YES" POD_LINT="NO"
 before_install:
-  - gem install cocoapods --no-rdoc --no-ri --no-document --quiet
-  - gem install xcpretty --no-rdoc --no-ri --no-document --quiet
-  - curl -OlL "https://github.com/Carthage/Carthage/releases/download/0.26.0/Carthage.pkg"
-  - sudo installer -pkg "Carthage.pkg" -target /
-  - rm "Carthage.pkg"
+  - gem install cocoapods --no-rdoc --no-ri --no-document
+  - gem install xcpretty --no-rdoc --no-ri --no-document
  - npm install ios-sim -g
  - ios-sim start --devicetypeid "com.apple.CoreSimulator.SimDeviceType.iPhone-8, 11.0"
-before_script:
-  - carthage update --use-submodules
 script:
  - set -o pipefail
  - xcodebuild -version
@@ -43,8 +34,8 @@ script:
      xcodebuild -workspace CoreStore.xcworkspace -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Debug ONLY_ACTIVE_ARCH=NO clean test | xcpretty -c;
      xcodebuild -workspace CoreStore.xcworkspace -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Release ONLY_ACTIVE_ARCH=NO clean test | xcpretty -c;
    fi
-  - xcodebuild -workspace "CoreStore.xcworkspace" -scheme "CoreStoreDemo" -sdk "iphonesimulator11.0" -destination "OS=11.0,name=iPhone 8" -configuration Debug ONLY_ACTIVE_ARCH=NO build | xcpretty -c;
-  - xcodebuild -workspace "CoreStore.xcworkspace" -scheme "CoreStoreDemo" -sdk "iphonesimulator11.0" -destination "OS=11.0,name=iPhone 8" -configuration Release ONLY_ACTIVE_ARCH=NO build | xcpretty -c;
+  - xcodebuild -workspace "CoreStore.xcworkspace" -scheme "CoreStoreDemo" -sdk "iphonesimulator12.0" -destination "OS=11.0.1,name=iPhone 8" -configuration Debug ONLY_ACTIVE_ARCH=NO build | xcpretty -c;
+  - xcodebuild -workspace "CoreStore.xcworkspace" -scheme "CoreStoreDemo" -sdk "iphonesimulator12.0" -destination "OS=11.0.1,name=iPhone 8" -configuration Release ONLY_ACTIVE_ARCH=NO build | xcpretty -c;
  - if [ $POD_LINT == "YES" ]; then
      pod lib lint --quick;
    fi
--- a/0
+++ b/0
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
--- a/CoreStore.podspec
+++ b/CoreStore.podspec
@@ -1,16 +1,18 @@
 Pod::Spec.new do |s|
    s.name = "CoreStore"
-    s.version = "5.0.0"
+    s.version = "6.3.2"
+    s.swift_version = "5.0"
    s.license = "MIT"
-    s.summary = "Unleashing the real power of Core Data with the elegance and safety of Swift"
    s.homepage = "https://github.com/JohnEstropia/CoreStore"
+    s.documentation_url = "https://JohnEstropia.github.io/CoreStore"
+    s.summary = "Unleashing the real power of Core Data with the elegance and safety of Swift"
    s.author = { "John Rommel Estropia" => "rommel.estropia@gmail.com" }
    s.source = { :git => "https://github.com/JohnEstropia/CoreStore.git", :tag => s.version.to_s }

-    s.ios.deployment_target = "8.0"
-    s.osx.deployment_target = "10.10"
-    s.watchos.deployment_target = "2.0"
-    s.tvos.deployment_target = "9.0"
+    s.ios.deployment_target = "10.0"
+    s.osx.deployment_target = "10.12"
+    s.watchos.deployment_target = "3.0"
+    s.tvos.deployment_target = "10.0"

    s.source_files = "Sources", "Sources/**/*.{swift,h,m}"
    s.public_header_files = "Sources/**/*.h"
--- a/CoreStore.sketch
+++ b/CoreStore.sketch
--- a/CoreStore.xcodeproj/project.pbxproj
+++ b/CoreStore.xcodeproj/project.pbxproj
@@ -27,7 +27,6 @@
 		82BA18AE1C4BBD3100A0916E /* DataStack+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */; };
 		82BA18AF1C4BBD3100A0916E /* CoreStore+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */; };
 		82BA18B01C4BBD3100A0916E /* NSManagedObject+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B50392F81C478FF3009900CA /* NSManagedObject+Transaction.swift */; };
-		82BA18B11C4BBD3100A0916E /* SaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EF21AFF846E0064E85B /* SaveResult.swift */; };
 		82BA18B21C4BBD3900A0916E /* ImportableObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8C1B9AA97D007C5CBB /* ImportableObject.swift */; };
 		82BA18B31C4BBD3900A0916E /* ImportableUniqueObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8F1B9AA991007C5CBB /* ImportableUniqueObject.swift */; };
 		82BA18B41C4BBD3900A0916E /* BaseDataTransaction+Importing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E834B81B76311F001D3D50 /* BaseDataTransaction+Importing.swift */; };
@@ -95,6 +94,8 @@
 		B51260941E9B28F100402229 /* EntityIdentifier.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51260921E9B28F100402229 /* EntityIdentifier.swift */; };
 		B51260951E9B28F100402229 /* EntityIdentifier.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51260921E9B28F100402229 /* EntityIdentifier.swift */; };
 		B51260961E9B28F100402229 /* EntityIdentifier.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51260921E9B28F100402229 /* EntityIdentifier.swift */; };
+		B51B5C2B22D43931009FA3BA /* String+KeyPaths.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51B5C2A22D43931009FA3BA /* String+KeyPaths.swift */; };
+		B51B5C2D22D43E38009FA3BA /* KeyPath+KeyPaths.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51B5C2C22D43E38009FA3BA /* KeyPath+KeyPaths.swift */; };
 		B51FE5AB1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51FE5AA1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift */; };
 		B51FE5AD1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51FE5AA1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift */; };
 		B51FE5AE1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift in Sources */ = {isa = PBXBuildFile; fileRef = B51FE5AA1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift */; };
@@ -165,14 +166,6 @@
 		B52557881D02DE8100E51965 /* FetchTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557871D02DE8100E51965 /* FetchTests.swift */; };
 		B52557891D02DE8100E51965 /* FetchTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557871D02DE8100E51965 /* FetchTests.swift */; };
 		B525578A1D02DE8100E51965 /* FetchTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557871D02DE8100E51965 /* FetchTests.swift */; };
-		B52661401CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */; };
-		B52661421CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */; };
-		B52661431CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */; };
-		B52661441CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */; };
-		B529C2041CA4A2DB007E7EBD /* CSSaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */; };
-		B529C2061CA4A2DB007E7EBD /* CSSaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */; };
-		B529C2071CA4A2DC007E7EBD /* CSSaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */; };
-		B529C2081CA4A2DC007E7EBD /* CSSaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */; };
 		B52DD17E1BE1F8CD00949AFE /* CoreStore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B52DD1741BE1F8CC00949AFE /* CoreStore.framework */; };
 		B52DD1931BE1F8FD00949AFE /* CoreStore.h in Headers */ = {isa = PBXBuildFile; fileRef = 2F03A53519C5C6DA005002A5 /* CoreStore.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		B52DD1941BE1F92500949AFE /* CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2F291E2619C6D3CF007AF63F /* CoreStore.swift */; };
@@ -189,7 +182,6 @@
 		B52DD1A01BE1F92C00949AFE /* UnsafeDataTransaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EED1AFF846E0064E85B /* UnsafeDataTransaction.swift */; };
 		B52DD1A11BE1F92C00949AFE /* DataStack+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */; };
 		B52DD1A21BE1F92C00949AFE /* CoreStore+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */; };
-		B52DD1A31BE1F92C00949AFE /* SaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EF21AFF846E0064E85B /* SaveResult.swift */; };
 		B52DD1A41BE1F92F00949AFE /* ImportableObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8C1B9AA97D007C5CBB /* ImportableObject.swift */; };
 		B52DD1A51BE1F92F00949AFE /* ImportableUniqueObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8F1B9AA991007C5CBB /* ImportableUniqueObject.swift */; };
 		B52DD1A61BE1F92F00949AFE /* BaseDataTransaction+Importing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E834B81B76311F001D3D50 /* BaseDataTransaction+Importing.swift */; };
@@ -297,6 +289,10 @@
 		B546F9741C9C553300D5AC55 /* SetupResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B546F9721C9C553300D5AC55 /* SetupResult.swift */; };
 		B546F9751C9C553300D5AC55 /* SetupResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B546F9721C9C553300D5AC55 /* SetupResult.swift */; };
 		B546F9761C9C553300D5AC55 /* SetupResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B546F9721C9C553300D5AC55 /* SetupResult.swift */; };
+		B5474D152227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */; };
+		B5474D162227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */; };
+		B5474D172227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */; };
+		B5474D182227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */; };
 		B5489F3F1CF5EEBC008B4978 /* TestEntity1.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F3D1CF5EEBC008B4978 /* TestEntity1.swift */; };
 		B5489F401CF5EEBC008B4978 /* TestEntity1.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F3D1CF5EEBC008B4978 /* TestEntity1.swift */; };
 		B5489F411CF5EEBC008B4978 /* TestEntity1.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F3D1CF5EEBC008B4978 /* TestEntity1.swift */; };
@@ -371,7 +367,6 @@
 		B563218B1BD65216006C9394 /* UnsafeDataTransaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EED1AFF846E0064E85B /* UnsafeDataTransaction.swift */; };
 		B563218C1BD65216006C9394 /* DataStack+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */; };
 		B563218D1BD65216006C9394 /* CoreStore+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */; };
-		B563218E1BD65216006C9394 /* SaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EF21AFF846E0064E85B /* SaveResult.swift */; };
 		B563218F1BD65216006C9394 /* ImportableObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8C1B9AA97D007C5CBB /* ImportableObject.swift */; };
 		B56321901BD65216006C9394 /* ImportableUniqueObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8F1B9AA991007C5CBB /* ImportableUniqueObject.swift */; };
 		B56321911BD65216006C9394 /* BaseDataTransaction+Importing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E834B81B76311F001D3D50 /* BaseDataTransaction+Importing.swift */; };
@@ -414,10 +409,6 @@
 		B565079A1D3930D1000596DA /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B56507991D3930D1000596DA /* Foundation.framework */; };
 		B565079E1D3930ED000596DA /* CoreData.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B565079D1D3930ED000596DA /* CoreData.framework */; };
 		B56507A01D3930F5000596DA /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B565079F1D3930F5000596DA /* Foundation.framework */; };
-		B5677D3D1CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */; };
-		B5677D3F1CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */; };
-		B5677D401CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */; };
-		B5677D411CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */; };
 		B56923C41EB823B4007C4DC9 /* NSEntityDescription+Migration.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56923C31EB823B4007C4DC9 /* NSEntityDescription+Migration.swift */; };
 		B56923C51EB823B4007C4DC9 /* NSEntityDescription+Migration.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56923C31EB823B4007C4DC9 /* NSEntityDescription+Migration.swift */; };
 		B56923C61EB823B4007C4DC9 /* NSEntityDescription+Migration.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56923C31EB823B4007C4DC9 /* NSEntityDescription+Migration.swift */; };
@@ -477,6 +468,12 @@
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 		B5831B7D1F34ACBA00A9F647 /* Transformable.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5831B791F34ACBA00A9F647 /* Transformable.swift */; };
+		B5831F4022126FEC00D8604C /* KeyPathGenericBindings.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */; };
+		B5831F4122126FEC00D8604C /* KeyPathGenericBindings.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */; };
+		B5831F4222126FED00D8604C /* KeyPathGenericBindings.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */; };
+		B5831F432212700400D8604C /* Where.Expression.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */; };
+		B5831F442212700500D8604C /* Where.Expression.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */; };
+		B5831F452212700500D8604C /* Where.Expression.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */; };
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 		B5A991EB1E9DC2CE0091A2E3 /* VersionLock.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = VersionLock.swift; sourceTree = "<group>"; };
 		B5A9921E1EA898710091A2E3 /* UserInfo.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UserInfo.swift; sourceTree = "<group>"; };
 		B5AD60CD1C90141E00F2B2E8 /* Package.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Package.swift; sourceTree = SOURCE_ROOT; };
@@ -881,7 +881,7 @@
 		B5C976E21C6C9F6A00B1AF90 /* UnsafeDataTransaction+Observing.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UnsafeDataTransaction+Observing.swift"; sourceTree = "<group>"; };
 		B5C976E61C6E3A5900B1AF90 /* CoreStoreFetchedResultsController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CoreStoreFetchedResultsController.swift; sourceTree = "<group>"; };
 		B5CA2B071F7E5ACA004B1936 /* WhereClauseType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WhereClauseType.swift; sourceTree = "<group>"; };
-		B5CA2B111F81DBFE004B1936 /* DynamicKeyPath.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DynamicKeyPath.swift; sourceTree = "<group>"; };
+		B5CA2B111F81DBFE004B1936 /* KeyPathStringConvertible.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeyPathStringConvertible.swift; sourceTree = "<group>"; };
 		B5D1E22B19FA9FBC003B2874 /* CoreStoreError.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CoreStoreError.swift; sourceTree = "<group>"; };
 		B5D2D5A91F7558CB00A4DE67 /* .cocoapods.yml */ = {isa = PBXFileReference; lastKnownFileType = text; path = .cocoapods.yml; sourceTree = SOURCE_ROOT; };
 		B5D339B31E925C2B00C880DE /* DynamicModelTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DynamicModelTests.swift; sourceTree = "<group>"; };
@@ -894,9 +894,10 @@
 		B5D33A001E96012400C880DE /* Relationship.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Relationship.swift; sourceTree = "<group>"; };
 		B5D372831A39CD6900F583D9 /* Model.xcdatamodel */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcdatamodel; path = Model.xcdatamodel; sourceTree = "<group>"; };
 		B5D39A0119FD00C9000E91BB /* Foundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Foundation.framework; path = System/Library/Frameworks/Foundation.framework; sourceTree = SDKROOT; };
-		B5D3F6441C887C0A00C7492A /* LegacySQLiteStore.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LegacySQLiteStore.swift; sourceTree = "<group>"; };
 		B5D7A5B51CA3BF8F005C752B /* CSInto.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSInto.swift; sourceTree = "<group>"; };
 		B5D9C8F61B160ED200E64F0E /* CoreStore.podspec */ = {isa = PBXFileReference; explicitFileType = text.script.ruby; path = CoreStore.podspec; sourceTree = SOURCE_ROOT; };
+		B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Where.Expression.swift; sourceTree = "<group>"; };
+		B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeyPathGenericBindings.swift; sourceTree = "<group>"; };
 		B5DBE2CC1C9914A900B5CEFA /* CSCoreStore.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSCoreStore.swift; sourceTree = "<group>"; };
 		B5DBE2D11C991B3E00B5CEFA /* CSDataStack.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSDataStack.swift; sourceTree = "<group>"; };
 		B5DBE2DA1C9939E100B5CEFA /* CoreStoreTests-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "CoreStoreTests-Bridging-Header.h"; sourceTree = "<group>"; };
@@ -925,7 +926,6 @@
 		B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "DataStack+Transaction.swift"; sourceTree = "<group>"; };
 		B5E84EED1AFF846E0064E85B /* UnsafeDataTransaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UnsafeDataTransaction.swift; sourceTree = "<group>"; };
 		B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "CoreStore+Transaction.swift"; sourceTree = "<group>"; };
-		B5E84EF21AFF846E0064E85B /* SaveResult.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SaveResult.swift; sourceTree = "<group>"; };
 		B5E84EF31AFF846E0064E85B /* SynchronousDataTransaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SynchronousDataTransaction.swift; sourceTree = "<group>"; };
 		B5E84EFE1AFF847B0064E85B /* BaseDataTransaction+Querying.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "BaseDataTransaction+Querying.swift"; sourceTree = "<group>"; };
 		B5E84F001AFF847B0064E85B /* Tweak.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Tweak.swift; sourceTree = "<group>"; };
@@ -950,6 +950,7 @@
 		B5E84F331AFF85470064E85B /* NSManagedObjectContext+Transaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSManagedObjectContext+Transaction.swift"; sourceTree = "<group>"; };
 		B5E84F351AFF85470064E85B /* NSManagedObjectContext+Querying.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSManagedObjectContext+Querying.swift"; sourceTree = "<group>"; };
 		B5E84F401AFF8CCD0064E85B /* TypeErasedClauses.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TypeErasedClauses.swift; sourceTree = "<group>"; };
+		B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "CoreStoreObject+Observing.swift"; sourceTree = "<group>"; };
 		B5ECDBDE1CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "CSBaseDataTransaction+Querying.swift"; sourceTree = "<group>"; };
 		B5ECDBE41CA6BEA300C7F112 /* CSClauseTypes.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSClauseTypes.swift; sourceTree = "<group>"; };
 		B5ECDBEB1CA6BF2000C7F112 /* CSFrom.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSFrom.swift; sourceTree = "<group>"; };
@@ -1040,6 +1041,8 @@
 		2F03A52619C5C6DA005002A5 = {
 			isa = PBXGroup;
 			children = (
+				B5A80DF52212C1BC006096AA /* Playground_iOS.playground */,
+				B5A80DF42212C1AB006096AA /* Playground_macOS.playground */,
 				2F291E3119C6D4D3007AF63F /* Frameworks */,
 				2F03A53219C5C6DA005002A5 /* Sources */,
 				2F03A53C19C5C6DA005002A5 /* CoreStoreTests */,
@@ -1082,6 +1085,7 @@
 				B5BDC91A1C202269008147CD /* Cartfile */,
 				B5D2D5A91F7558CB00A4DE67 /* .cocoapods.yml */,
 				B5BDC9271C2024F2008147CD /* .travis.yml */,
+				B524E78721CA20AC00BEB794 /* .jazzy.yaml */,
 				B5AD60CD1C90141E00F2B2E8 /* Package.swift */,
 			);
 			name = "Supporting Files";
@@ -1114,6 +1118,7 @@
 				B5489F3C1CF5EEBC008B4978 /* TestEntities */,
 				B5489F451CF5F017008B4978 /* TransactionTests.swift */,
 				B525577F1D029D2500E51965 /* TweakTests.swift */,
+				B59A51822256C85E00CEF3C5 /* VersionLockTests.swift */,
 				B52557731D02791400E51965 /* WhereTests.swift */,
 			);
 			path = CoreStoreTests;
@@ -1164,6 +1169,17 @@
 			name = Observing;
 			sourceTree = "<group>";
 		};
+		B51B5C2922D43854009FA3BA /* KeyPaths */ = {
+			isa = PBXGroup;
+			children = (
+				B5CA2B111F81DBFE004B1936 /* KeyPathStringConvertible.swift */,
+				B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */,
+				B51B5C2C22D43E38009FA3BA /* KeyPath+KeyPaths.swift */,
+				B51B5C2A22D43931009FA3BA /* String+KeyPaths.swift */,
+			);
+			name = KeyPaths;
+			sourceTree = "<group>";
+		};
 		B5215CA21FA47BF300139E3A /* Chained Clauses */ = {
 			isa = PBXGroup;
 			children = (
@@ -1245,7 +1261,6 @@
 				B5E222291CA51B6E00BA2E95 /* CSUnsafeDataTransaction.swift */,
 				B5ECDC281CA81CC700C7F112 /* CSDataStack+Transaction.swift */,
 				B5ECDC2E1CA81CDC00C7F112 /* CSCoreStore+Transaction.swift */,
-				B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */,
 			);
 			name = Transactions;
 			sourceTree = "<group>";
@@ -1323,7 +1338,6 @@
 			children = (
 				B5A1DAC71F111BFA003CF369 /* KeyPath+Querying.swift */,
 				B5D339EB1E9495E500C880DE /* CoreStoreObject+Querying.swift */,
-				B5CA2B111F81DBFE004B1936 /* DynamicKeyPath.swift */,
 			);
 			name = "KeyPath Utilities";
 			sourceTree = "<group>";
@@ -1336,6 +1350,7 @@
 				B549F6721E56A92800FBAB2D /* CoreDataNativeType.swift */,
 				B5D339F01E94AF5800C880DE /* CoreStoreStrings.swift */,
 				B5E84EDA1AFF84500064E85B /* Setup */,
+				B51B5C2922D43854009FA3BA /* KeyPaths */,
 				B5E84EE21AFF84610064E85B /* Logging */,
 				B5E84EE91AFF846E0064E85B /* Transactions */,
 				B5E834B61B7630BD001D3D50 /* Importing */,
@@ -1443,7 +1458,6 @@
 				B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */,
 				B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */,
 				B50392F81C478FF3009900CA /* NSManagedObject+Transaction.swift */,
-				B5E84EF21AFF846E0064E85B /* SaveResult.swift */,
 			);
 			name = Transactions;
 			sourceTree = "<group>";
@@ -1471,6 +1485,7 @@
 				B5E84F011AFF847B0064E85B /* From.swift */,
 				B5E84F031AFF847B0064E85B /* Select.swift */,
 				B5E84F051AFF847B0064E85B /* Where.swift */,
+				B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */,
 				B5E84F041AFF847B0064E85B /* OrderBy.swift */,
 				B5E84F021AFF847B0064E85B /* GroupBy.swift */,
 				B5E84F001AFF847B0064E85B /* Tweak.swift */,
@@ -1493,6 +1508,7 @@
 				B56007131B3F6C2800A9A8F9 /* SectionBy.swift */,
 				B5E84F1A1AFF84860064E85B /* DataStack+Observing.swift */,
 				B5E84F1B1AFF84860064E85B /* CoreStore+Observing.swift */,
+				B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */,
 				B5C976E21C6C9F6A00B1AF90 /* UnsafeDataTransaction+Observing.swift */,
 				B5E84F1C1AFF84860064E85B /* ObjectMonitor.swift */,
 				B5E84F1F1AFF84860064E85B /* ObjectObserver.swift */,
@@ -1520,8 +1536,8 @@
 			children = (
 				B5831B6F1F34AC3400A9F647 /* AttributeProtocol.swift */,
 				B5831B741F34AC7A00A9F647 /* RelationshipProtocol.swift */,
+				B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */,
 				B5C976E61C6E3A5900B1AF90 /* CoreStoreFetchedResultsController.swift */,
-				B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */,
 				B53B275E1EE3B92E00E9B352 /* CoreStoreManagedObject.swift */,
 				B533C4DA1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift */,
 				B51260921E9B28F100402229 /* EntityIdentifier.swift */,
@@ -1572,9 +1588,6 @@
 				B5FE4DA11C8481E100FA6A91 /* StorageInterface.swift */,
 				B5FE4DA61C84FB4400FA6A91 /* InMemoryStore.swift */,
 				B5FE4DAB1C85D44E00FA6A91 /* SQLiteStore.swift */,
-				B5D3F6441C887C0A00C7492A /* LegacySQLiteStore.swift */,
-				B59FA0AD1CCBAC95007C9BCA /* ICloudStore.swift */,
-				B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */,
 			);
 			name = StorageInterfaces;
 			sourceTree = "<group>";
@@ -1754,7 +1767,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = "John Rommel Estropia";
 				TargetAttributes = {
 					2F03A52F19C5C6DA005002A5 = {
@@ -1791,6 +1804,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 				Base,
 			);
@@ -1875,17 +1889,16 @@
 				B5F1DA901B9AA991007C5CBB /* ImportableUniqueObject.swift in Sources */,
 				B51260891E9B252B00402229 /* NSEntityDescription+DynamicModel.swift in Sources */,
 				B504D0D61B02362500B2BBB1 /* CoreStore+Setup.swift in Sources */,
-				B529C2041CA4A2DB007E7EBD /* CSSaveResult.swift in Sources */,
 				B5D1E22C19FA9FBC003B2874 /* CoreStoreError.swift in Sources */,
 				B5E84F131AFF847B0064E85B /* Where.swift in Sources */,
 				B5D339D81E9489AB00C880DE /* CoreStoreObject.swift in Sources */,
-				B5D3F6451C887C0A00C7492A /* LegacySQLiteStore.swift in Sources */,
 				B56923FA1EB82956007C4DC9 /* CSXcodeDataModelSchema.swift in Sources */,
 				B55514EA1EED8BF900BAB888 /* From+Querying.swift in Sources */,
 				B596BBBB1DD5C39F001DCDD9 /* QueryableSource.swift in Sources */,
 				B5ECDBFF1CA80CBA00C7F112 /* CSWhere.swift in Sources */,
 				B5ECDC051CA8138100C7F112 /* CSOrderBy.swift in Sources */,
 				B5E1B5981CAA0C23007FD580 /* CSObjectObserver.swift in Sources */,
+				B5DAFB4A2203E01D003FCCD0 /* KeyPathGenericBindings.swift in Sources */,
 				B5519A5F1CA21954002BEF78 /* CSAsynchronousDataTransaction.swift in Sources */,
 				B52FD3AA1E3B3EF10001D919 /* NSManagedObject+Logging.swift in Sources */,
 				B52F74411E9B8724005F3DAC /* UnsafeDataModelSchema.swift in Sources */,
@@ -1903,6 +1916,7 @@
 				B5C976E31C6C9F6A00B1AF90 /* UnsafeDataTransaction+Observing.swift in Sources */,
 				B53FBA121CAB63CB00F0D40A /* Progress+ObjectiveC.swift in Sources */,
 				B5831B751F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
+				B51B5C2D22D43E38009FA3BA /* KeyPath+KeyPaths.swift in Sources */,
 				B5E1B5A81CAA49E2007FD580 /* CSDataStack+Migrating.swift in Sources */,
 				B5D339F11E94AF5800C880DE /* CoreStoreStrings.swift in Sources */,
 				B56007161B4018AB00A9A8F9 /* MigrationChain.swift in Sources */,
@@ -1916,7 +1930,6 @@
 				B56923F01EB827F6007C4DC9 /* XcodeSchemaMappingProvider.swift in Sources */,
 				B5E84F121AFF847B0064E85B /* OrderBy.swift in Sources */,
 				B546F9581C99B17400D5AC55 /* CSCoreStore+Setup.swift in Sources */,
-				B5677D3D1CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */,
 				B5E84F361AFF85470064E85B /* NSManagedObjectContext+Setup.swift in Sources */,
 				B5FAD6AE1B518DCB00714891 /* CoreStore+Migration.swift in Sources */,
 				B5E84EE71AFF84610064E85B /* CoreStore+Logging.swift in Sources */,
@@ -1925,11 +1938,11 @@
 				B56007111B3F6BD500A9A8F9 /* Into.swift in Sources */,
 				B5E84F111AFF847B0064E85B /* Select.swift in Sources */,
 				B51260931E9B28F100402229 /* EntityIdentifier.swift in Sources */,
+				B5DAFB482203D9F8003FCCD0 /* Where.Expression.swift in Sources */,
 				B5FE4DA21C8481E100FA6A91 /* StorageInterface.swift in Sources */,
 				B53FB9FE1CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
 				B5DBE2D21C991B3E00B5CEFA /* CSDataStack.swift in Sources */,
 				B50392F91C478FF3009900CA /* NSManagedObject+Transaction.swift in Sources */,
-				B52661401CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */,
 				B53FBA181CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				B5202CFA1C04688100DED140 /* NSFetchedResultsController+Convenience.swift in Sources */,
 				B5519A591CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
@@ -1966,7 +1979,6 @@
 				B5519A4A1CA1F4FB002BEF78 /* CSError.swift in Sources */,
 				B52F742F1E9B50D0005F3DAC /* SchemaHistory.swift in Sources */,
 				B5E84EF51AFF846E0064E85B /* BaseDataTransaction.swift in Sources */,
-				B5E84EFB1AFF846E0064E85B /* SaveResult.swift in Sources */,
 				B5D339EC1E9495E500C880DE /* CoreStoreObject+Querying.swift in Sources */,
 				B5E84F0F1AFF847B0064E85B /* From.swift in Sources */,
 				B5FAD6A91B50A4B400714891 /* Progress+Convenience.swift in Sources */,
@@ -1994,8 +2006,8 @@
 				B5E84F201AFF84860064E85B /* DataStack+Observing.swift in Sources */,
 				B501FDDD1CA8D05000BE22EF /* CSSectionBy.swift in Sources */,
 				B538BA771D15B3E30003A766 /* CoreStoreBridge.m in Sources */,
+				B51B5C2B22D43931009FA3BA /* String+KeyPaths.swift in Sources */,
 				B512607F1E97A18000402229 /* CoreStoreObject+Convenience.swift in Sources */,
-				B59FA0AE1CCBAC95007C9BCA /* ICloudStore.swift in Sources */,
 				B5E84EF81AFF846E0064E85B /* CoreStore+Transaction.swift in Sources */,
 				B5E84F301AFF849C0064E85B /* NSManagedObjectContext+CoreStore.swift in Sources */,
 				B5831B7A1F34ACBA00A9F647 /* Transformable.swift in Sources */,
@@ -2004,10 +2016,12 @@
 				B549F65E1E569C7400FBAB2D /* QueryableAttributeType.swift in Sources */,
 				B5E84F211AFF84860064E85B /* CoreStore+Observing.swift in Sources */,
 				B559CD431CAA8B6300E4D58B /* CSSetupResult.swift in Sources */,
-				B5CA2B121F81DBFE004B1936 /* DynamicKeyPath.swift in Sources */,
+				B5CA2B121F81DBFE004B1936 /* KeyPathStringConvertible.swift in Sources */,
 				B5A991EC1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
 				B5FE4DA71C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
 				B52F743D1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
+				B5E8A72021C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B5474D152227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */,
 				B56923FF1EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CAE1FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				B5ECDBEC1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
@@ -2050,6 +2064,7 @@
 				B5489F461CF5F017008B4978 /* TransactionTests.swift in Sources */,
 				B52557801D029D2500E51965 /* TweakTests.swift in Sources */,
 				B580857A1CDF808C004C2EEB /* SetupTests.swift in Sources */,
+				B59A51832256C85E00CEF3C5 /* VersionLockTests.swift in Sources */,
 				B5489F4C1CF5F743008B4978 /* BaseTestCase.swift in Sources */,
 				B5DBE2DF1C9939E100B5CEFA /* BridgingTests.m in Sources */,
 				B57D27BE1D0BBE8200539C58 /* BaseTestDataTestCase.swift in Sources */,
@@ -2071,7 +2086,6 @@
 				82BA18A21C4BBD1D00A0916E /* CoreStoreError.swift in Sources */,
 				B512608A1E9B252B00402229 /* NSEntityDescription+DynamicModel.swift in Sources */,
 				82BA18B21C4BBD3900A0916E /* ImportableObject.swift in Sources */,
-				B529C2061CA4A2DB007E7EBD /* CSSaveResult.swift in Sources */,
 				82BA18AE1C4BBD3100A0916E /* DataStack+Transaction.swift in Sources */,
 				82BA18AB1C4BBD3100A0916E /* AsynchronousDataTransaction.swift in Sources */,
 				B5D339D91E9489AB00C880DE /* CoreStoreObject.swift in Sources */,
@@ -2101,7 +2115,6 @@
 				B5831B761F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
 				B5E1B5AA1CAA49E2007FD580 /* CSDataStack+Migrating.swift in Sources */,
 				B5D339F21E94AF5800C880DE /* CoreStoreStrings.swift in Sources */,
-				B5D3F6461C887C0A00C7492A /* LegacySQLiteStore.swift in Sources */,
 				B5E1B59F1CAA2568007FD580 /* CSDataStack+Observing.swift in Sources */,
 				B5ECDC251CA81A3900C7F112 /* CSCoreStore+Querying.swift in Sources */,
 				B549F6741E56A92800FBAB2D /* CoreDataNativeType.swift in Sources */,
@@ -2112,14 +2125,14 @@
 				B56923F11EB827F6007C4DC9 /* XcodeSchemaMappingProvider.swift in Sources */,
 				82BA18A11C4BBD1D00A0916E /* CoreStore.swift in Sources */,
 				B546F9591C99B17400D5AC55 /* CSCoreStore+Setup.swift in Sources */,
-				B5677D3F1CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */,
 				82BA18CF1C4BBD7100A0916E /* Functions.swift in Sources */,
 				82BA18A31C4BBD2200A0916E /* DataStack.swift in Sources */,
 				82BA18C81C4BBD5900A0916E /* MigrationChain.swift in Sources */,
 				B546F9741C9C553300D5AC55 /* SetupResult.swift in Sources */,
+				B5831F4022126FEC00D8604C /* KeyPathGenericBindings.swift in Sources */,
 				B53CA9A31EF1EF1600E0F440 /* PartialObject.swift in Sources */,
-				82BA18B11C4BBD3100A0916E /* SaveResult.swift in Sources */,
 				82BA18DD1C4BBE1400A0916E /* NSFetchedResultsController+Convenience.swift in Sources */,
+				B5831F432212700400D8604C /* Where.Expression.swift in Sources */,
 				B51260941E9B28F100402229 /* EntityIdentifier.swift in Sources */,
 				B5FE4DA81C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
 				B53FBA001CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
@@ -2127,7 +2140,6 @@
 				82BA18B41C4BBD3900A0916E /* BaseDataTransaction+Importing.swift in Sources */,
 				B53FBA1A1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				82BA18CA1C4BBD5900A0916E /* MigrationResult.swift in Sources */,
-				B52661421CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */,
 				B5519A5A1CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
 				B5ECDBE11CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
 				82BA18C11C4BBD5300A0916E /* CoreStore+Observing.swift in Sources */,
@@ -2188,7 +2200,6 @@
 				82BA18CB1C4BBD6400A0916E /* NSManagedObject+Convenience.swift in Sources */,
 				82BA18B51C4BBD3F00A0916E /* BaseDataTransaction+Querying.swift in Sources */,
 				B501FDDF1CA8D05000BE22EF /* CSSectionBy.swift in Sources */,
-				B59FA0B01CCBACA7007C9BCA /* ICloudStore.swift in Sources */,
 				B538BA781D15B3E30003A766 /* CoreStoreBridge.m in Sources */,
 				B51260801E97A18000402229 /* CoreStoreObject+Convenience.swift in Sources */,
 				82BA18D31C4BBD7100A0916E /* NSManagedObjectContext+CoreStore.swift in Sources */,
@@ -2200,10 +2211,12 @@
 				B549F65F1E569C7400FBAB2D /* QueryableAttributeType.swift in Sources */,
 				B559CD451CAA8B6300E4D58B /* CSSetupResult.swift in Sources */,
 				82BA18B81C4BBD4200A0916E /* TypeErasedClauses.swift in Sources */,
-				B5CA2B131F81DBFE004B1936 /* DynamicKeyPath.swift in Sources */,
+				B5CA2B131F81DBFE004B1936 /* KeyPathStringConvertible.swift in Sources */,
 				B5A991ED1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
 				B5ECDBEE1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
 				B52F743E1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
+				B5E8A72121C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B5474D162227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */,
 				B56924001EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CAF1FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				82BA18D61C4BBD7100A0916E /* NSManagedObjectContext+Transaction.swift in Sources */,
@@ -2246,6 +2259,7 @@
 				B52557711D02561A00E51965 /* SelectTests.swift in Sources */,
 				B5489F471CF5F017008B4978 /* TransactionTests.swift in Sources */,
 				B52557811D029D2500E51965 /* TweakTests.swift in Sources */,
+				B59A51842256C85E00CEF3C5 /* VersionLockTests.swift in Sources */,
 				B5489F4D1CF5F743008B4978 /* BaseTestCase.swift in Sources */,
 				82BA18DC1C4BBD9C00A0916E /* Model.xcdatamodeld in Sources */,
 				B57D27BF1D0BBE8200539C58 /* BaseTestDataTestCase.swift in Sources */,
@@ -2262,7 +2276,6 @@
 				B5220E1E1D13080D009BC71E /* CSListMonitor.swift in Sources */,
 				B5DBE2D01C9914A900B5CEFA /* CSCoreStore.swift in Sources */,
 				B5CA2B0B1F7E5ACA004B1936 /* WhereClauseType.swift in Sources */,
-				B5677D411CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */,
 				B56923F81EB828BF007C4DC9 /* CSDynamicSchema.swift in Sources */,
 				B52DD1BE1BE1F94300949AFE /* Progress+Convenience.swift in Sources */,
 				B512608C1E9B252B00402229 /* NSEntityDescription+DynamicModel.swift in Sources */,
@@ -2291,7 +2304,6 @@
 				B52DD1AB1BE1F93900949AFE /* From.swift in Sources */,
 				B546F95B1C99B17400D5AC55 /* CSCoreStore+Setup.swift in Sources */,
 				B52DD1A11BE1F92C00949AFE /* DataStack+Transaction.swift in Sources */,
-				B5D3F6481C887C0A00C7492A /* LegacySQLiteStore.swift in Sources */,
 				B5220E1C1D130801009BC71E /* FetchedResultsControllerDelegate.swift in Sources */,
 				B52DD19E1BE1F92C00949AFE /* AsynchronousDataTransaction.swift in Sources */,
 				B5831B781F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
@@ -2313,9 +2325,11 @@
 				B52DD1961BE1F92500949AFE /* DataStack.swift in Sources */,
 				B5ECDBFD1CA804FD00C7F112 /* NSManagedObjectContext+ObjectiveC.swift in Sources */,
 				B52DD1BD1BE1F94300949AFE /* NSManagedObject+Convenience.swift in Sources */,
+				B5831F4222126FED00D8604C /* KeyPathGenericBindings.swift in Sources */,
 				B53CA9A51EF1EF1600E0F440 /* PartialObject.swift in Sources */,
 				B52DD1AD1BE1F93900949AFE /* Where.swift in Sources */,
 				B53FBA1C1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
+				B5831F452212700500D8604C /* Where.Expression.swift in Sources */,
 				B51260961E9B28F100402229 /* EntityIdentifier.swift in Sources */,
 				B5ECDBE31CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
 				B5ECDC031CA80CBA00C7F112 /* CSWhere.swift in Sources */,
@@ -2324,7 +2338,6 @@
 				B52DD1C71BE1F94600949AFE /* NSManagedObjectContext+Querying.swift in Sources */,
 				B52DD1C81BE1F94600949AFE /* NSManagedObjectContext+Setup.swift in Sources */,
 				B52DD1C31BE1F94600949AFE /* NotificationObserver.swift in Sources */,
-				B52661441CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */,
 				B52DD1A81BE1F93200949AFE /* DataStack+Querying.swift in Sources */,
 				B5220E221D130818009BC71E /* CSSectionBy.swift in Sources */,
 				B52DD1BC1BE1F94000949AFE /* MigrationResult.swift in Sources */,
@@ -2345,7 +2358,6 @@
 				B52DD19C1BE1F92C00949AFE /* Into.swift in Sources */,
 				B5FE4DA51C8481E100FA6A91 /* StorageInterface.swift in Sources */,
 				B596BBB91DD5BC67001DCDD9 /* FetchableSource.swift in Sources */,
-				B529C2081CA4A2DC007E7EBD /* CSSaveResult.swift in Sources */,
 				B5FE4DAA1C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
 				B52DD1AF1BE1F93900949AFE /* GroupBy.swift in Sources */,
 				B52DD1B01BE1F93900949AFE /* Tweak.swift in Sources */,
@@ -2356,7 +2368,6 @@
 				B52DD1BA1BE1F94000949AFE /* MigrationChain.swift in Sources */,
 				B50392FB1C479640009900CA /* NSManagedObject+Transaction.swift in Sources */,
 				B52F74321E9B50D0005F3DAC /* SchemaHistory.swift in Sources */,
-				B52DD1A31BE1F92C00949AFE /* SaveResult.swift in Sources */,
 				B5220E211D130816009BC71E /* CSObjectObserver.swift in Sources */,
 				B5D339EF1E9495E500C880DE /* CoreStoreObject+Querying.swift in Sources */,
 				B52DD19F1BE1F92C00949AFE /* SynchronousDataTransaction.swift in Sources */,
@@ -2366,7 +2377,6 @@
 				B5215CAC1FA4810300139E3A /* QueryChainBuilder.swift in Sources */,
 				B53FBA0F1CAB5E6500F0D40A /* CSCoreStore+Migrating.swift in Sources */,
 				B52F744D1E9B8740005F3DAC /* CoreStoreSchema.swift in Sources */,
-				B59FA0B21CCBACA8007C9BCA /* ICloudStore.swift in Sources */,
 				B52DD19A1BE1F92800949AFE /* CoreStore+Logging.swift in Sources */,
 				B52DD1A71BE1F93200949AFE /* BaseDataTransaction+Querying.swift in Sources */,
 				B546F96C1C9AF26D00D5AC55 /* CSInMemoryStore.swift in Sources */,
@@ -2396,10 +2406,12 @@
 				B549F6611E569C7400FBAB2D /* QueryableAttributeType.swift in Sources */,
 				B52DD19B1BE1F92800949AFE /* CoreStoreLogger.swift in Sources */,
 				B52DD1991BE1F92800949AFE /* DefaultLogger.swift in Sources */,
-				B5CA2B151F81DBFF004B1936 /* DynamicKeyPath.swift in Sources */,
+				B5CA2B151F81DBFF004B1936 /* KeyPathStringConvertible.swift in Sources */,
 				B5A991EF1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
 				B5220E201D130813009BC71E /* CSObjectMonitor.swift in Sources */,
 				B52F74401E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
+				B5E8A72321C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B5474D182227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */,
 				B56924021EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CB11FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				B5220E171D1306DF009BC71E /* UnsafeDataTransaction+Observing.swift in Sources */,
@@ -2442,6 +2454,7 @@
 				B5489F481CF5F017008B4978 /* TransactionTests.swift in Sources */,
 				B52557821D029D2500E51965 /* TweakTests.swift in Sources */,
 				B5489F4E1CF5F743008B4978 /* BaseTestCase.swift in Sources */,
+				B59A51852256C85E00CEF3C5 /* VersionLockTests.swift in Sources */,
 				B5598BCC1BE2093D0092EFCE /* Model.xcdatamodeld in Sources */,
 				B5220E261D1308C2009BC71E /* ListObserverTests.swift in Sources */,
 				B57D27C01D0BBE8200539C58 /* BaseTestDataTestCase.swift in Sources */,
@@ -2463,7 +2476,6 @@
 				B56321801BD65216006C9394 /* CoreStoreError.swift in Sources */,
 				B512608B1E9B252B00402229 /* NSEntityDescription+DynamicModel.swift in Sources */,
 				B56321AD1BD6521C006C9394 /* MigrationManager.swift in Sources */,
-				B529C2071CA4A2DC007E7EBD /* CSSaveResult.swift in Sources */,
 				B563219D1BD65216006C9394 /* DataStack+Observing.swift in Sources */,
 				B56321961BD65216006C9394 /* From.swift in Sources */,
 				B5D339DA1E9489AB00C880DE /* CoreStoreObject.swift in Sources */,
@@ -2491,7 +2503,6 @@
 				B53FBA151CAB63CB00F0D40A /* Progress+ObjectiveC.swift in Sources */,
 				B5E1B5AB1CAA49E2007FD580 /* CSDataStack+Migrating.swift in Sources */,
 				B5831B771F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
-				B5D3F6471C887C0A00C7492A /* LegacySQLiteStore.swift in Sources */,
 				B5D339F31E94AF5800C880DE /* CoreStoreStrings.swift in Sources */,
 				B5E1B5A01CAA2568007FD580 /* CSDataStack+Observing.swift in Sources */,
 				B5ECDC261CA81A3900C7F112 /* CSCoreStore+Querying.swift in Sources */,
@@ -2503,20 +2514,20 @@
 				B56321911BD65216006C9394 /* BaseDataTransaction+Importing.swift in Sources */,
 				B56923F21EB827F6007C4DC9 /* XcodeSchemaMappingProvider.swift in Sources */,
 				B546F95A1C99B17400D5AC55 /* CSCoreStore+Setup.swift in Sources */,
-				B5677D401CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */,
 				B56321941BD65216006C9394 /* CoreStore+Querying.swift in Sources */,
 				B56321811BD65216006C9394 /* DataStack.swift in Sources */,
 				B56321A81BD65219006C9394 /* NSManagedObject+Convenience.swift in Sources */,
 				B546F9751C9C553300D5AC55 /* SetupResult.swift in Sources */,
 				B56321981BD65216006C9394 /* Where.swift in Sources */,
+				B5831F4122126FEC00D8604C /* KeyPathGenericBindings.swift in Sources */,
 				B53CA9A41EF1EF1600E0F440 /* PartialObject.swift in Sources */,
 				B5202CFD1C046E8400DED140 /* NSFetchedResultsController+Convenience.swift in Sources */,
 				B5FE4DA91C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
+				B5831F442212700500D8604C /* Where.Expression.swift in Sources */,
 				B51260951E9B28F100402229 /* EntityIdentifier.swift in Sources */,
 				B53FBA011CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
 				B5DBE2D41C991B3E00B5CEFA /* CSDataStack.swift in Sources */,
 				B50392FA1C47963F009900CA /* NSManagedObject+Transaction.swift in Sources */,
-				B52661431CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */,
 				B53FBA1B1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				B5519A5B1CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
 				B5ECDBE21CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
@@ -2556,7 +2567,6 @@
 				B56321991BD65216006C9394 /* OrderBy.swift in Sources */,
 				B5D339EE1E9495E500C880DE /* CoreStoreObject+Querying.swift in Sources */,
 				B56321A51BD65216006C9394 /* MigrationChain.swift in Sources */,
-				B563218E1BD65216006C9394 /* SaveResult.swift in Sources */,
 				B5E222261CA4E12600BA2E95 /* CSSynchronousDataTransaction.swift in Sources */,
 				B56321A21BD65216006C9394 /* ListObserver.swift in Sources */,
 				B5215CAB1FA4810300139E3A /* QueryChainBuilder.swift in Sources */,
@@ -2580,7 +2590,6 @@
 				B56321851BD65216006C9394 /* CoreStore+Logging.swift in Sources */,
 				B56321921BD65216006C9394 /* BaseDataTransaction+Querying.swift in Sources */,
 				B501FDE01CA8D05000BE22EF /* CSSectionBy.swift in Sources */,
-				B59FA0B11CCBACA7007C9BCA /* ICloudStore.swift in Sources */,
 				B538BA791D15B3E30003A766 /* CoreStoreBridge.m in Sources */,
 				B51260811E97A18000402229 /* CoreStoreObject+Convenience.swift in Sources */,
 				B56321B11BD6521C006C9394 /* NSManagedObjectContext+CoreStore.swift in Sources */,
@@ -2592,10 +2601,12 @@
 				B549F6601E569C7400FBAB2D /* QueryableAttributeType.swift in Sources */,
 				B559CD461CAA8B6300E4D58B /* CSSetupResult.swift in Sources */,
 				B56321A61BD65216006C9394 /* MigrationType.swift in Sources */,
-				B5CA2B141F81DBFE004B1936 /* DynamicKeyPath.swift in Sources */,
+				B5CA2B141F81DBFE004B1936 /* KeyPathStringConvertible.swift in Sources */,
 				B5A991EE1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
 				B5ECDBEF1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
 				B52F743F1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
+				B5E8A72221C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B5474D172227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */,
 				B56924011EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CB01FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				B56321B41BD6521C006C9394 /* NSManagedObjectContext+Transaction.swift in Sources */,
@@ -2640,6 +2651,7 @@
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				APPLICATION_EXTENSION_API_ONLY = YES;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -2648,6 +2660,7 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -2655,6 +2668,7 @@
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -2683,8 +2697,8 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				INFOPLIST_FILE = Sources/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.10;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				OTHER_SWIFT_FLAGS = "-D DEBUG";
@@ -2693,12 +2707,12 @@
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TVOS_DEPLOYMENT_TARGET = 9.0;
+				TVOS_DEPLOYMENT_TARGET = 10.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
-				WATCHOS_DEPLOYMENT_TARGET = 2.0;
+				WATCHOS_DEPLOYMENT_TARGET = 3.0;
 			};
 			name = Debug;
 		};
@@ -2707,6 +2721,7 @@
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				APPLICATION_EXTENSION_API_ONLY = YES;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -2715,6 +2730,7 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -2722,6 +2738,7 @@
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -2745,21 +2762,21 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				INFOPLIST_FILE = Sources/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.10;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.CoreStore;
 				PRODUCT_NAME = CoreStore;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TVOS_DEPLOYMENT_TARGET = 9.0;
+				TVOS_DEPLOYMENT_TARGET = 10.0;
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
-				WATCHOS_DEPLOYMENT_TARGET = 2.0;
+				WATCHOS_DEPLOYMENT_TARGET = 3.0;
 			};
 			name = Release;
 		};
@@ -2778,7 +2795,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -2797,7 +2813,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -2818,7 +2833,6 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -2834,7 +2848,6 @@
 				SDKROOT = iphoneos;
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -2855,7 +2868,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 			};
 			name = Debug;
@@ -2877,7 +2889,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 			};
 			name = Release;
@@ -2896,7 +2907,6 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 			};
 			name = Debug;
@@ -2915,7 +2925,6 @@
 				SDKROOT = appletvos;
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 			};
 			name = Release;
@@ -2940,7 +2949,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -2965,7 +2973,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -2986,7 +2993,6 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -3007,7 +3013,6 @@
 				SDKROOT = macosx;
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -3029,7 +3034,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 4;
 			};
 			name = Debug;
@@ -3053,7 +3057,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 4;
 			};
 			name = Release;
--- a/CoreStore.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/CoreStore.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
--- a/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
+++ b/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
@@ -26,7 +26,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
         <TestableReference
@@ -56,7 +55,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
--- a/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
+++ b/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
@@ -40,7 +40,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
         <TestableReference
@@ -75,7 +74,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
@@ -91,6 +89,12 @@
            ReferencedContainer = "container:CoreStore.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
+      <CommandLineArguments>
+         <CommandLineArgument
+            argument = "-com.apple.CoreData.SQLDebug 2"
+            isEnabled = "NO">
+         </CommandLineArgument>
+      </CommandLineArguments>
      <AdditionalOptions>
      </AdditionalOptions>
   </LaunchAction>
--- a/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
+++ b/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
@@ -26,7 +26,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
         <TestableReference
@@ -56,7 +55,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
--- a/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
+++ b/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
@@ -26,7 +26,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
      </Testables>
@@ -37,7 +36,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
--- a/CoreStore.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/CoreStore.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
--- a/CoreStore.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
+++ b/CoreStore.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict/>
+</plist>
--- a/CoreStoreDemo/CoreStoreDemo.xcodeproj/project.pbxproj
+++ b/CoreStoreDemo/CoreStoreDemo.xcodeproj/project.pbxproj
@@ -265,7 +265,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0700;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 0930;
 				ORGANIZATIONNAME = "John Rommel Estropia";
 				TargetAttributes = {
 					B54AAD481AF4D26E00848AE0 = {
@@ -276,7 +276,7 @@
 			};
 			buildConfigurationList = B54AAD441AF4D26E00848AE0 /* Build configuration list for PBXProject "CoreStoreDemo" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
@@ -375,12 +375,14 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -408,13 +410,13 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -430,12 +432,14 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -456,11 +460,11 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
@@ -470,12 +474,10 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				INFOPLIST_FILE = CoreStoreDemo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.corestore.demo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -484,13 +486,11 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				INFOPLIST_FILE = CoreStoreDemo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.corestore.demo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
--- a/CoreStoreDemo/CoreStoreDemo.xcodeproj/xcshareddata/xcschemes/CoreStoreDemo.xcscheme
+++ b/CoreStoreDemo/CoreStoreDemo.xcodeproj/xcshareddata/xcschemes/CoreStoreDemo.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
@@ -26,7 +26,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
      </Testables>
@@ -46,7 +45,6 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
--- a/CoreStoreDemo/CoreStoreDemo/AppDelegate.swift
+++ b/CoreStoreDemo/CoreStoreDemo/AppDelegate.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/02.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -18,9 +18,8 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
    
    var window: UIWindow?

-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]? = nil) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
        
-        application.statusBarStyle = .lightContent
        return true
    }
 }
--- a/CoreStoreDemo/CoreStoreDemo/Base.lproj/LaunchScreen.xib
+++ b/CoreStoreDemo/CoreStoreDemo/Base.lproj/LaunchScreen.xib
@@ -1,9 +1,11 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="10112" systemVersion="15D21" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14313.18" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
    <dependencies>
-        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10083"/>
-        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14283.14"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <objects>
        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
@@ -12,10 +14,10 @@
            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
            <subviews>
-                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="  Copyright © 2015 John Rommel Estropia. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
-                    <rect key="frame" x="20" y="439" width="441" height="21"/>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="  Copyright © 2018 John Rommel Estropia. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
+                    <rect key="frame" x="20" y="439" width="440" height="21"/>
                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                    <color key="textColor" red="0.92549019607843142" green="0.94117647058823528" blue="0.94509803921568625" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                    <color key="textColor" red="0.90744441747665405" green="0.9265514612197876" blue="0.93116652965545654" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                    <nil key="highlightedColor"/>
                </label>
                <imageView userInteractionEnabled="NO" contentMode="center" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="CoreStoreIcon" translatesAutoresizingMaskIntoConstraints="NO" id="q8C-V6-gXH">
@@ -24,11 +26,11 @@
                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="CoreStore" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
                    <rect key="frame" x="20" y="273" width="440" height="57.5"/>
                    <fontDescription key="fontDescription" name="HelveticaNeue-UltraLight" family="Helvetica Neue" pointSize="50"/>
-                    <color key="textColor" red="0.92549019607843142" green="0.94117647058823528" blue="0.94509803921568625" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                    <color key="textColor" red="0.90744441747665405" green="0.9265514612197876" blue="0.93116652965545654" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                    <nil key="highlightedColor"/>
                </label>
            </subviews>
-            <color key="backgroundColor" red="0.20392156862745098" green="0.28627450980392155" blue="0.36862745098039218" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <color key="backgroundColor" red="0.15542715787887573" green="0.2203737199306488" blue="0.2959403395652771" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
            <constraints>
                <constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
                <constraint firstAttribute="bottom" secondItem="8ie-xW-0ye" secondAttribute="bottom" constant="20" id="Kzo-t9-V3l"/>
--- a/CoreStoreDemo/CoreStoreDemo/Base.lproj/Main.storyboard
+++ b/CoreStoreDemo/CoreStoreDemo/Base.lproj/Main.storyboard
@@ -1,14 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="Ni8-QF-XHB">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="Ni8-QF-XHB">
    <device id="retina4_7" orientation="portrait">
        <adaptation id="fullscreen"/>
    </device>
    <dependencies>
        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
-        <capability name="Aspect ratio constraints" minToolsVersion="5.1"/>
-        <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
-        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <customFonts key="customFonts">
@@ -78,14 +75,14 @@
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Title" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="8b8-lM-Krq">
-                                            <rect key="frame" x="15" y="13" width="28.5" height="19"/>
+                                            <rect key="frame" x="16" y="13" width="28.5" height="19"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="16"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
                                        </label>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Subtitle" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="hR1-Zb-BOk">
-                                            <rect key="frame" x="308" y="13" width="52" height="19"/>
+                                            <rect key="frame" x="307" y="13" width="52" height="19"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="16"/>
                                            <color key="textColor" red="0.55686274509803924" green="0.55686274509803924" blue="0.57647058823529407" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -136,7 +133,7 @@
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <button opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="OQf-Bd-Zze">
-                                                    <rect key="frame" x="295" y="8" width="72" height="27.5"/>
+                                                    <rect key="frame" x="288" y="11" width="72" height="22"/>
                                                    <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
                                                    <inset key="contentEdgeInsets" minX="7" minY="0.0" maxX="7" maxY="0.0"/>
                                                    <state key="normal" title="mutate!"/>
@@ -145,7 +142,7 @@
                                                    </connections>
                                                </button>
                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="VZk-6K-4ut">
-                                                    <rect key="frame" x="15" y="8" width="270" height="27.5"/>
+                                                    <rect key="frame" x="22" y="11" width="256" height="22"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Thin" family="Helvetica Neue" pointSize="17"/>
                                                    <color key="textColor" red="0.15542715787887573" green="0.2203737199306488" blue="0.2959403395652771" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
@@ -275,18 +272,18 @@
                                        <rect key="frame" x="0.0" y="35" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="AXm-KE-45G" id="9te-Wx-hkf">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Accounts" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="Q3n-Df-v1t">
-                                                    <rect key="frame" x="15" y="6" width="82" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="82" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Setting up multiple persistent store configurations" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="Hbn-cf-Y7m">
-                                                    <rect key="frame" x="15" y="30" width="263.5" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="263.5" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -302,18 +299,18 @@
                                        <rect key="frame" x="0.0" y="85" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="fsb-zw-8Ii" id="Upm-AO-Fw3">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Colors" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="vpt-cT-gMo">
-                                                    <rect key="frame" x="15" y="6" width="56" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="56" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Observing list changes and single object changes" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="ou9-TZ-8bf">
-                                                    <rect key="frame" x="15" y="30" width="260.5" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="260.5" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -329,18 +326,18 @@
                                        <rect key="frame" x="0.0" y="135" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="ekW-PJ-mbo" id="CYq-mg-PVS">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Placemarks" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="UbU-Kd-yrY">
-                                                    <rect key="frame" x="15" y="6" width="100.5" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="100.5" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Making changes with transactions" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="uP1-Jc-o9v">
-                                                    <rect key="frame" x="15" y="30" width="179" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="179" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -356,18 +353,18 @@
                                        <rect key="frame" x="0.0" y="185" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="ph1-8z-C1m" id="nNz-rd-ksg">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Time Zones" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="C8Y-0y-lEG">
-                                                    <rect key="frame" x="15" y="6" width="101.5" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="101.5" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Fetching objects and raw values" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="jZw-qE-0ws">
-                                                    <rect key="frame" x="15" y="30" width="168.5" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="168.5" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -383,18 +380,18 @@
                                        <rect key="frame" x="0.0" y="235" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="wyK-rk-3tI" id="fLd-KK-QcW">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Logger" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="ZfY-Aq-Ykq">
-                                                    <rect key="frame" x="15" y="6" width="61" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="61" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Implementing a custom logger" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="QzD-9b-k1j">
-                                                    <rect key="frame" x="15" y="30" width="159" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="159" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -410,18 +407,18 @@
                                        <rect key="frame" x="0.0" y="285" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="xTM-Cf-0if" id="DfO-BW-krd">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Evolution" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="hSG-mG-YBw">
-                                                    <rect key="frame" x="15" y="6" width="78.5" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="78.5" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Migrating and de-migrating stores" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="X9P-TQ-LYh">
-                                                    <rect key="frame" x="15" y="30" width="179.5" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="179.5" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -460,7 +457,7 @@
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <view contentMode="scaleToFill" verticalCompressionResistancePriority="250" translatesAutoresizingMaskIntoConstraints="NO" id="NhC-oM-bkd">
-                                <rect key="frame" x="16" y="89.5" width="343" height="50"/>
+                                <rect key="frame" x="16" y="69.5" width="343" height="70"/>
                                <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                <constraints>
                                    <constraint firstAttribute="height" relation="greaterThanOrEqual" id="TIX-qi-B34"/>
@@ -512,7 +509,7 @@
                                </connections>
                            </slider>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="p4O-tf-dgt">
-                                <rect key="frame" x="16" y="69" width="343" height="20.5"/>
+                                <rect key="frame" x="16" y="49" width="343" height="20.5"/>
                                <fontDescription key="fontDescription" type="boldSystem" pointSize="17"/>
                                <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                <nil key="highlightedColor"/>
@@ -623,7 +620,7 @@
                    <tabBarItem key="tabBarItem" title="Demo" image="second" id="3iQ-I2-4LW"/>
                    <toolbarItems/>
                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="00L-5k-Eno">
-                        <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
+                        <rect key="frame" x="0.0" y="20" width="375" height="44"/>
                        <autoresizingMask key="autoresizingMask"/>
                        <color key="tintColor" red="0.90744441747665405" green="0.9265514612197876" blue="0.93116652965545654" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <color key="barTintColor" red="0.15542715787887573" green="0.2203737199306488" blue="0.2959403395652771" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -653,18 +650,18 @@
                                <rect key="frame" x="0.0" y="22" width="375" height="44"/>
                                <autoresizingMask key="autoresizingMask"/>
                                <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="G3X-70-BCD" id="aT8-nz-i5l">
-                                    <rect key="frame" x="0.0" y="0.0" width="342" height="43.5"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="341" height="43.5"/>
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="uQX-PI-UWF">
-                                            <rect key="frame" x="8" y="8" width="27" height="27"/>
+                                            <rect key="frame" x="16" y="11" width="22" height="22"/>
                                            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <constraints>
                                                <constraint firstAttribute="width" secondItem="uQX-PI-UWF" secondAttribute="height" multiplier="1:1" id="9qA-iN-Neb"/>
                                            </constraints>
                                        </view>
                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="HJC-5w-lIN">
-                                            <rect key="frame" x="45" y="8" width="34.5" height="27"/>
+                                            <rect key="frame" x="48" y="11" width="34.5" height="22"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue" family="Helvetica Neue" pointSize="14"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
@@ -713,18 +710,18 @@
                                <rect key="frame" x="0.0" y="22" width="375" height="44"/>
                                <autoresizingMask key="autoresizingMask"/>
                                <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="zSO-3e-OVq" id="cHA-by-n4b">
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+                                    <rect key="frame" x="0.0" y="0.0" width="341" height="43.5"/>
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                                    <subviews>
                                        <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="5uq-Yi-XwH">
-                                            <rect key="frame" x="8" y="8" width="27" height="27"/>
+                                            <rect key="frame" x="16" y="11" width="22" height="22"/>
                                            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <constraints>
                                                <constraint firstAttribute="width" secondItem="5uq-Yi-XwH" secondAttribute="height" multiplier="1:1" id="oOe-HC-VyN"/>
                                            </constraints>
                                        </view>
                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Zyu-PC-WmO">
-                                            <rect key="frame" x="45" y="8" width="34.5" height="27"/>
+                                            <rect key="frame" x="48" y="11" width="34.5" height="22"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue" family="Helvetica Neue" pointSize="14"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
@@ -767,7 +764,7 @@
                    <extendedEdge key="edgesForExtendedLayout" bottom="YES"/>
                    <toolbarItems/>
                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="6XA-6M-yvZ">
-                        <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
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                        <color key="tintColor" red="0.68773996829986572" green="0.71417498588562012" blue="0.73246318101882935" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <color key="barTintColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -794,11 +791,11 @@
                        <viewControllerLayoutGuide type="bottom" id="RZg-hi-T8O"/>
                    </layoutGuides>
                    <view key="view" contentMode="scaleToFill" id="k4s-iL-Krh">
-                        <rect key="frame" x="0.0" y="64" width="375" height="603"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="603"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
-                            <mapView verifyAmbiguity="ignoreSizes" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" ambiguous="YES" mapType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="V2U-0R-Ts0">
-                                <rect key="frame" x="0.0" y="0.0" width="375" height="558"/>
+                            <mapView verifyAmbiguity="ignoreSizes" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" mapType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="V2U-0R-Ts0">
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="603"/>
                                <connections>
                                    <outlet property="delegate" destination="jPl-fH-NlD" id="Sjn-YC-haS"/>
                                </connections>
@@ -888,7 +885,7 @@
                    <extendedEdge key="edgesForExtendedLayout" bottom="YES"/>
                    <toolbarItems/>
                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="wJo-mp-1pS">
-                        <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
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                        <color key="tintColor" red="0.68773996829986572" green="0.71417498588562012" blue="0.73246318101882935" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
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@@ -1008,14 +1005,14 @@
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="name" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="RgX-yK-1L2">
-                                            <rect key="frame" x="15" y="11" width="48.5" height="24"/>
+                                            <rect key="frame" x="16" y="11" width="48.5" height="24"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
                                        </label>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="offset" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="QZ4-A2-x4h">
-                                            <rect key="frame" x="15" y="35" width="31" height="13.5"/>
+                                            <rect key="frame" x="16" y="35" width="31" height="13.5"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -1054,14 +1051,14 @@
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="name" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="Syt-QJ-KXg">
-                                            <rect key="frame" x="15" y="11" width="48.5" height="24"/>
+                                            <rect key="frame" x="16" y="11" width="48.5" height="24"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
                                        </label>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="offset" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="yHS-dP-IKS">
-                                            <rect key="frame" x="15" y="35" width="31" height="13.5"/>
+                                            <rect key="frame" x="16" y="35" width="31" height="13.5"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
--- a/Demo/FetchingAndQueryingDemoViewController.swift
+++ b/Demo/FetchingAndQueryingDemoViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/12.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -25,7 +25,7 @@ private struct Static {
        _ = try? dataStack.perform(
            synchronous: { (transaction) in
                
-                transaction.deleteAll(From<TimeZone>())
+                try transaction.deleteAll(From<TimeZone>())
                
                for name in NSTimeZone.knownTimeZoneNames {
                    
@@ -164,17 +164,17 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
            title: "All Time Zones",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .orderBy(.ascending(\.name))
-                )!
+                )
            }
        ),
        (
            title: "Time Zones in Asia",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .where(
                            format: "%K BEGINSWITH[c] %@",
@@ -182,14 +182,14 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            "Asia"
                        )
                        .orderBy(.ascending(\.secondsFromGMT))
-                )!
+                )
            }
        ),
        (
            title: "Time Zones in America and Europe",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .where(
                            format: "%K BEGINSWITH[c] %@ OR %K BEGINSWITH[c] %@",
@@ -199,14 +199,14 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            "Europe"
                        )
                        .orderBy(.ascending(\.secondsFromGMT))
-                )!
+                )
            }
        ),
        (
            title: "All Time Zones Except America",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .where(
                            format: "%K BEGINSWITH[c] %@",
@@ -214,18 +214,18 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            "America"
                        )
                        .orderBy(.ascending(\.secondsFromGMT))
-                    )!
+                    )
            }
        ),
        (
            title: "Time Zones with Summer Time",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .where(\.hasDaylightSavingTime == true)
                        .orderBy(.ascending(\.name))
-                )!
+                )
            }
        )
    ]
@@ -235,28 +235,28 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
            title: "Number of Time Zones",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryValue(
+                return try! Static.timeZonesStack.queryValue(
                    From<TimeZone>()
                        .select(NSNumber.self, .count(\.name))
-                )! as Any
+                )!
            }
        ),
        (
            title: "Abbreviation For Tokyo's Time Zone",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryValue(
+                return try! Static.timeZonesStack.queryValue(
                    From<TimeZone>()
                        .select(String.self, .attribute(\.abbreviation))
                        .where(format: "%K ENDSWITH[c] %@", #keyPath(TimeZone.name), "Tokyo")
-                )! as Any
+                )!
            }
        ),
        (
            title: "All Abbreviations",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryAttributes(
+                return try! Static.timeZonesStack.queryAttributes(
                    From<TimeZone>()
                        .select(
                            NSDictionary.self,
@@ -264,14 +264,14 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            .attribute(\.abbreviation)
                        )
                        .orderBy(.ascending(\.name))
-                )!
+                )
            }
        ),
        (
            title: "Number of Countries per Time Zone",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryAttributes(
+                return try! Static.timeZonesStack.queryAttributes(
                    From<TimeZone>()
                        .select(
                            NSDictionary.self,
@@ -283,14 +283,14 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            .ascending(\.secondsFromGMT),
                            .ascending(\.name)
                        )
-                )!
+                )
            }
        ),
        (
            title: "Number of Countries with Summer Time",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryAttributes(
+                return try! Static.timeZonesStack.queryAttributes(
                    From<TimeZone>()
                        .select(
                            NSDictionary.self,
@@ -302,7 +302,7 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            .descending(\.hasDaylightSavingTime),
                            .ascending(\.name)
                        )
-                )!
+                )
            }
        )
    ]
--- a/Demo/FetchingResultsViewController.swift
+++ b/Demo/FetchingResultsViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/17.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -30,7 +30,7 @@ class FetchingResultsViewController: UITableViewController {
        super.viewDidLoad()
        
        self.tableView.estimatedRowHeight = 60
-        self.tableView.rowHeight = UITableViewAutomaticDimension
+        self.tableView.rowHeight = UITableView.automaticDimension
    }
    
    
--- a/Demo/QueryingResultsViewController.swift
+++ b/Demo/QueryingResultsViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/17.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -49,7 +49,7 @@ class QueryingResultsViewController: UITableViewController {
        super.viewDidLoad()
        
        self.tableView.estimatedRowHeight = 60
-        self.tableView.rowHeight = UITableViewAutomaticDimension
+        self.tableView.rowHeight = UITableView.automaticDimension
    }
    
    
--- a/CoreStoreDemo/CoreStoreDemo/Fetching
+++ b/CoreStoreDemo/CoreStoreDemo/Fetching
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/15.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
--- a/CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Contents.json
+++ b/CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Contents.json
@@ -1,5 +1,15 @@
 {
  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
    {
      "idiom" : "iphone",
      "size" : "29x29",
@@ -32,6 +42,36 @@
      "filename" : "Icon-60@3x-1.png",
      "scale" : "3x"
    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
    {
      "size" : "76x76",
      "idiom" : "ipad",
@@ -44,6 +84,22 @@
      "filename" : "Icon-76@2x.png",
      "scale" : "2x"
    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Mask + Oval 1 + Oval 1 + Oval 1.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "car",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
    {
      "size" : "60x60",
      "idiom" : "car",
--- a/CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Mask
+++ b/CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Mask
--- a/CoreStoreDemo/CoreStoreDemo/Info.plist
+++ b/CoreStoreDemo/CoreStoreDemo/Info.plist
@@ -17,7 +17,7 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>4.0.3</string>
+	<string>6.3.2</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
--- a/Demo/ListObserverDemoViewController.swift
+++ b/Demo/ListObserverDemoViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/02.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -122,6 +122,11 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
                target: self,
                action: #selector(self.addBarButtonItemTouched(_:))
            ),
+            UIBarButtonItem(
+                barButtonSystemItem: .refresh,
+                target: self,
+                action: #selector(self.shuffleBarButtonItemTouched(_:))
+            ),
            filterBarButton
        ]
        self.filterBarButton = filterBarButton
@@ -155,7 +160,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        
-        return ColorsDemo.palettes.numberOfObjectsInSection(section)
+        return ColorsDemo.palettes.numberOfObjects(in: section)
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
@@ -182,7 +187,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
        )
    }
    
-    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
+    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        
        switch editingStyle {
            
@@ -203,7 +208,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
    
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        
-        return ColorsDemo.palettes.sectionInfoAtIndex(section).name
+        return ColorsDemo.palettes.sectionInfo(at: section).name
    }
    
    
@@ -255,9 +260,8 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
    }
    
    func listMonitor(_ monitor: ListMonitor<Palette>, didMoveObject object: Palette, fromIndexPath: IndexPath, toIndexPath: IndexPath) {
-        
-        self.tableView.deleteRows(at: [fromIndexPath], with: .automatic)
-        self.tableView.insertRows(at: [toIndexPath], with: .automatic)
+
+        self.tableView.moveRow(at: fromIndexPath, to: toIndexPath)
    }
    
    
@@ -268,7 +272,6 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
        self.tableView.insertSections(IndexSet(integer: sectionIndex), with: .automatic)
    }
    
-    
    func listMonitor(_ monitor: ListMonitor<Palette>, didDeleteSection sectionInfo: NSFetchedResultsSectionInfo, fromSectionIndex sectionIndex: Int) {
        
        self.tableView.deleteSections(IndexSet(integer: sectionIndex), with: .automatic)
@@ -284,7 +287,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
        ColorsDemo.stack.perform(
            asynchronous: { (transaction) in
                
-                transaction.deleteAll(From<Palette>())
+                try transaction.deleteAll(From<Palette>())
            },
            completion: { _ in }
        )
@@ -306,9 +309,29 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
            completion: { _ in }
        )
    }
+
+    @IBAction private dynamic func shuffleBarButtonItemTouched(_ sender: AnyObject?) {
+
+        self.setTable(enabled: false)
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+
+                for palette in try transaction.fetchAll(From<Palette>()) {
+
+                    palette.hue .= Palette.randomHue()
+                    palette.colorName .= nil
+                }
+            },
+            completion: { _ in
+
+                self.setTable(enabled: true)
+            }
+        )
+    }
    
    private func setTable(enabled: Bool) {
-        
+
+        tableView.isUserInteractionEnabled = enabled
        UIView.animate(
            withDuration: 0.2,
            delay: 0,
@@ -318,7 +341,6 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
                if let tableView = self.tableView {
                    
                    tableView.alpha = enabled ? 1.0 : 0.5
-                    tableView.isUserInteractionEnabled = enabled
                }
            },
            completion: nil
--- a/Demo/ObjectObserverDemoViewController.swift
+++ b/Demo/ObjectObserverDemoViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/06.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -50,7 +50,7 @@ class ObjectObserverDemoViewController: UIViewController, ObjectObserver {
    
    required init?(coder aDecoder: NSCoder) {
        
-        if let palette = ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.hue))) {
+        if let palette = try! ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.hue))) {
            
            self.monitor = ColorsDemo.stack.monitorObject(palette)
        }
@@ -64,7 +64,7 @@ class ObjectObserverDemoViewController: UIViewController, ObjectObserver {
                }
            )
            
-            let palette = ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.hue)))!
+            let palette = try! ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.hue)))!
            self.monitor = ColorsDemo.stack.monitorObject(palette)
        }
        
@@ -184,15 +184,15 @@ class ObjectObserverDemoViewController: UIViewController, ObjectObserver {
        
        self.hsbLabel?.text = palette.colorText
        
-        if changedKeys == nil || changedKeys?.contains(Palette.keyPath{ $0.hue }) == true {
+        if changedKeys == nil || changedKeys?.contains(String(keyPath: \Palette.hue)) == true {
            
            self.hueSlider?.value = Float(palette.hue.value)
        }
-        if changedKeys == nil || changedKeys?.contains(Palette.keyPath{ $0.saturation }) == true {
+        if changedKeys == nil || changedKeys?.contains(String(keyPath: \Palette.saturation)) == true {
            
            self.saturationSlider?.value = palette.saturation.value
        }
-        if changedKeys == nil || changedKeys?.contains(Palette.keyPath{ $0.brightness }) == true {
+        if changedKeys == nil || changedKeys?.contains(String(keyPath: \Palette.brightness)) == true {
            
            self.brightnessSlider?.value = palette.brightness.value
        }
--- a/Demo/ObserversViewController.swift
+++ b/Demo/ObserversViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/24.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
--- a/CoreStoreDemo/CoreStoreDemo/List
+++ b/CoreStoreDemo/CoreStoreDemo/List
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/05.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
@@ -25,6 +25,11 @@ final class Palette: CoreStoreObject {
        isTransient: true,
        customGetter: Palette.getColorName
    )
+
+    static func randomHue() -> Int {
+
+        return Int(arc4random_uniform(360))
+    }
    
    private static func getColorName(_ partialObject: PartialObject<Palette>) -> String? {
        
@@ -71,7 +76,7 @@ extension Palette {
    
    func setInitialValues(in transaction: BaseDataTransaction) {
        
-        self.hue .= Int(arc4random_uniform(360))
+        self.hue .= Palette.randomHue()
        self.saturation .= Float(1.0)
        self.brightness .= Float(arc4random_uniform(70) + 30) / 100.0
    }
--- a/CoreStoreDemo/CoreStoreDemo/List
+++ b/CoreStoreDemo/CoreStoreDemo/List
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/05.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
--- a/Demo/CustomLoggerViewController.swift
+++ b/Demo/CustomLoggerViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/05.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -16,11 +16,6 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
    
    // MARK: NSObject
    
-    deinit {
-        
-        CoreStore.logger = DefaultLogger()
-    }
-    
    let dataStack = DataStack()
    
    // MARK: UIViewController
@@ -30,13 +25,14 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
        super.viewDidLoad()
        
        try! self.dataStack.addStorageAndWait(SQLiteStore(fileName: "emptyStore.sqlite"))
-        CoreStore.logger = self
    }
    
    override func viewDidAppear(_ animated: Bool) {
        
        super.viewDidAppear(animated)
-        
+
+        CoreStore.logger = self
+
        let alert = UIAlertController(
            title: "Logger Demo",
            message: "This demo shows how to plug-in any logging framework to CoreStore.\n\nThe view controller implements CoreStoreLogger and appends all logs to the text view.",
@@ -46,6 +42,13 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
        self.present(alert, animated: true, completion: nil)
    }

+    override func viewDidDisappear(_ animated: Bool) {
+
+        super.viewDidDisappear(animated)
+
+        CoreStore.logger = DefaultLogger()
+    }
+
    
    // MARK: CoreStoreLogger
    
@@ -113,7 +116,7 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
        case 2?:
            DispatchQueue.global(qos: .background).async {
                
-                _ = self.dataStack.fetchOne(From<Place>())
+                _ = try! self.dataStack.fetchOne(From<Place>())
            }
            
        default:
--- a/Demo/MigrationsDemoViewController.swift
+++ b/Demo/MigrationsDemoViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/21.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -79,7 +79,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
    func listMonitorDidChange(_ monitor: ListMonitor<NSManagedObject>) {
        
        if self.lastSelectedIndexPath == nil,
-            let numberOfObjectsInSection = self.listMonitor?.numberOfObjectsInSection(0),
+            let numberOfObjectsInSection = self.listMonitor?.numberOfObjects(in: 0),
            numberOfObjectsInSection > 0 {
            
            self.tableView?.reloadData()
@@ -100,7 +100,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
    
    @objc dynamic func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        
-        return self.listMonitor?.numberOfObjectsInSection(0) ?? 0
+        return self.listMonitor?.numberOfObjects(in: 0) ?? 0
    }
    
    @objc dynamic func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
@@ -286,7 +286,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
                
                self.set(dataStack: dataStack, model: model, scrollToSelection: true)
                
-                let count = dataStack.queryValue(
+                let count = try! dataStack.queryValue(
                    From<NSManagedObject>(model.entityType)
                        .select(Int.self, .count(#keyPath(OrganismV1.dna))))!
                if count > 0 {
@@ -360,7 +360,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
        if let dataStack = dataStack, let model = model {
            
            self.segmentedControl?.selectedSegmentIndex = self.models
-                .index(
+                .firstIndex(
                    where: { (arg) -> Bool in
                        
                        let (_, _, schemaHistory) = arg
@@ -378,7 +378,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
            
            if self.lastSelectedIndexPath == nil  {
                
-                if listMonitor.numberOfObjectsInSection(0) > 0 {
+                if listMonitor.numberOfObjects(in: 0) > 0 {
                    
                    self.setSelectedIndexPath(IndexPath(row: 0, section: 0), scrollToSelection: true)
                }
@@ -386,7 +386,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
        }
        else {
           
-            self.segmentedControl?.selectedSegmentIndex = UISegmentedControlNoSegment
+            self.segmentedControl?.selectedSegmentIndex = UISegmentedControl.noSegment
            self._listMonitor = nil
            self._dataStack = nil
        }
--- a/CoreStoreDemo/CoreStoreDemo/MIgrations
+++ b/CoreStoreDemo/CoreStoreDemo/MIgrations
@@ -3,12 +3,12 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/27.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation

-protocol OrganismProtocol: class {
+protocol OrganismProtocol: AnyObject {
    
    var dna: Int64 { get set }
    
--- a/CoreStoreDemo/CoreStoreDemo/MIgrations
+++ b/CoreStoreDemo/CoreStoreDemo/MIgrations
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/07/12.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
--- a/CoreStoreDemo/CoreStoreDemo/MIgrations
+++ b/CoreStoreDemo/CoreStoreDemo/MIgrations
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/21.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
--- a/CoreStoreDemo/CoreStoreDemo/MIgrations
+++ b/CoreStoreDemo/CoreStoreDemo/MIgrations
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/21.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
--- a/Demo/OrganismV2ToV3MigrationPolicy.swift
+++ b/Demo/OrganismV2ToV3MigrationPolicy.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/27.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import CoreData
--- a/CoreStoreDemo/CoreStoreDemo/MIgrations
+++ b/CoreStoreDemo/CoreStoreDemo/MIgrations
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/27.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
--- a/CoreStoreDemo/CoreStoreDemo/Stack
+++ b/CoreStoreDemo/CoreStoreDemo/Stack
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/06.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
--- a/CoreStoreDemo/CoreStoreDemo/Stack
+++ b/CoreStoreDemo/CoreStoreDemo/Stack
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/06/06.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
--- a/Demo/StackSetupDemoViewController.swift
+++ b/Demo/StackSetupDemoViewController.swift
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/24.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
@@ -36,7 +36,7 @@ private struct Static {
        _ = try? dataStack.perform(
            synchronous: { (transaction) in
                
-                transaction.deleteAll(From<UserAccount>())
+                try transaction.deleteAll(From<UserAccount>())
                
                let account1 = transaction.create(Into<MaleAccount>(maleConfiguration))
                account1.accountType = "Facebook"
@@ -74,7 +74,7 @@ private struct Static {
        _ = try? dataStack.perform(
            synchronous: { (transaction) in
                
-                transaction.deleteAll(From<UserAccount>())
+                try transaction.deleteAll(From<UserAccount>())
                
                let account1 = transaction.create(Into<MaleAccount>(maleConfiguration))
                account1.accountType = "Twitter"
@@ -99,8 +99,8 @@ private struct Static {
 class StackSetupDemoViewController: UITableViewController {
    
    let accounts = [
-        Static.facebookStack.fetchAll(From(UserAccount.self)) ?? [],
-        Static.twitterStack.fetchAll(From(UserAccount.self)) ?? []
+        try! Static.facebookStack.fetchAll(From<UserAccount>()),
+        try! Static.twitterStack.fetchAll(From<UserAccount>())
    ]
    
    
--- a/CoreStoreDemo/CoreStoreDemo/Stack
+++ b/CoreStoreDemo/CoreStoreDemo/Stack
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/24.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
--- a/CoreStoreDemo/CoreStoreDemo/Transactions
+++ b/CoreStoreDemo/CoreStoreDemo/Transactions
@@ -3,7 +3,7 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/24.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import Foundation
--- a/Demo/TransactionsDemoViewController.swift
+++ b/Demo/TransactionsDemoViewController.swift
@@ -3,10 +3,11 @@
 //  CoreStoreDemo
 //
 //  Created by John Rommel Estropia on 2015/05/24.
-//  Copyright © 2015 John Rommel Estropia. All rights reserved.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
 //

 import UIKit
+import Contacts
 import CoreLocation
 import MapKit
 import AddressBookUI
@@ -25,7 +26,7 @@ private struct Static {
            )
        )
        
-        var place = CoreStore.fetchOne(From<Place>())
+        var place = try! CoreStore.fetchOne(From<Place>())
        if place == nil {
            
            _ = try? CoreStore.perform(
@@ -35,7 +36,7 @@ private struct Static {
                    place.setInitialValues()
                }
            )
-            place = CoreStore.fetchOne(From<Place>())
+            place = try! CoreStore.fetchOne(From<Place>())
        }
        
        return CoreStore.monitorObject(place!)
@@ -203,11 +204,23 @@ class TransactionsDemoViewController: UIViewController, MKMapViewDelegate, Objec
            CLLocation(latitude: place.latitude, longitude: place.longitude),
            completionHandler: { [weak self] (placemarks, error) -> Void in
                
-                if let placemark = placemarks?.first, let addressDictionary = placemark.addressDictionary {
+                if let placemark = placemarks?.first, let dictionary = placemark.addressDictionary {
                    
                    let place = transaction.edit(Static.placeController.object)
                    place?.title = placemark.name
-                    place?.subtitle = ABCreateStringWithAddressDictionary(addressDictionary, true)
+                    place?.subtitle = CNPostalAddressFormatter.string(
+                        from: autoreleasepool {
+                            
+                            let address = CNMutablePostalAddress()
+                            (dictionary["Street"] as? String).flatMap({ address.street = $0 })
+                            (dictionary["State"] as? String).flatMap({ address.state = $0 })
+                            (dictionary["City"] as? String).flatMap({ address.city = $0 })
+                            (dictionary["Country"] as? String).flatMap({ address.country = $0 })
+                            (dictionary["ZIP"] as? String).flatMap({ address.postalCode = $0 })
+                            return address
+                        },
+                        style: .mailingAddress
+                    )
                    transaction.commit { (_) -> Void in }
                }
                
--- a/CoreStoreTests/BaseTests/BaseTestCase.swift
+++ b/CoreStoreTests/BaseTests/BaseTestCase.swift
@@ -2,7 +2,7 @@
 //  BaseTestCase.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -36,8 +36,7 @@ class BaseTestCase: XCTestCase {
    // MARK: Internal
    
    @nonobjc
-    @discardableResult
-    func prepareStack<T>(configurations: [ModelConfiguration] = [nil], _ closure: (_ dataStack: DataStack) -> T) -> T {
+    func prepareStack(configurations: [ModelConfiguration] = [nil], _ closure: (_ dataStack: DataStack) throws -> Void) {
        
        let stack = DataStack(
            xcodeModelName: "Model",
@@ -57,16 +56,16 @@ class BaseTestCase: XCTestCase {
                    )
                )
            }
+            try closure(stack)
        }
        catch let error as NSError {
            
            XCTFail(error.coreStoreDumpString)
        }
-        return closure(stack)
    }
    
    @nonobjc
-    func expectLogger<T>(_ expectations: [TestLogger.Expectation], closure: () -> T) -> T {
+    func expectLogger<T>(_ expectations: [TestLogger.Expectation], closure: () throws -> T) rethrows -> T {
        
        CoreStore.logger = TestLogger(self.prepareLoggerExpectations(expectations))
        defer {
@@ -74,7 +73,7 @@ class BaseTestCase: XCTestCase {
            self.checkExpectationsImmediately()
            CoreStore.logger = TestLogger([:])
        }
-        return closure()
+        return try closure()
    }
    
    @nonobjc
@@ -82,6 +81,33 @@ class BaseTestCase: XCTestCase {
        
        CoreStore.logger = TestLogger(expectations)
    }
+
+    @nonobjc
+    func expectError<T>(code: CoreStoreErrorCode, closure: () throws -> T) {
+
+        CoreStore.logger = TestLogger(self.prepareLoggerExpectations([.logError]))
+        defer {
+
+            self.checkExpectationsImmediately()
+            CoreStore.logger = TestLogger([:])
+        }
+        do {
+
+            _ = try closure()
+        }
+        catch let error as CoreStoreError {
+
+            if error.errorCode == code.rawValue {
+
+                return
+            }
+            XCTFail("Expected error code \(code) different from actual error: \((error as NSError).coreStoreDumpString)")
+        }
+        catch {
+
+            XCTFail("Error not wrapped as \(cs_typeName(CoreStoreError.self)): \((error as NSError).coreStoreDumpString)")
+        }
+    }
    
    @nonobjc
    func prepareLoggerExpectations(_ expectations: [TestLogger.Expectation]) -> [TestLogger.Expectation: XCTestExpectation] {
--- a/CoreStoreTests/BaseTests/BaseTestDataTestCase.swift
+++ b/CoreStoreTests/BaseTests/BaseTestDataTestCase.swift
@@ -2,7 +2,7 @@
 //  BaseTestDataTestCase.swift
 //  CoreStore
 //
-//  Copyright © 2017 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
--- a/CoreStoreTests/BridgingTests.h
+++ b/CoreStoreTests/BridgingTests.h
@@ -2,7 +2,7 @@
 //  BridgingTests.h
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
--- a/CoreStoreTests/BridgingTests.m
+++ b/CoreStoreTests/BridgingTests.m
@@ -2,7 +2,7 @@
 //  BridgingTests.m
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -193,7 +193,17 @@
    XCTAssertEqualObjects([[sqliteStorage class] storeType], [CSSQLiteStore storeType]);
    XCTAssertEqualObjects([[sqliteStorage class] storeType], NSSQLiteStoreType);
    XCTAssertNil(sqliteStorage.configuration);
-    XCTAssertEqualObjects(sqliteStorage.storeOptions, @{ NSSQLitePragmasOption: @{ @"journal_mode": @"WAL" } });
+    NSDictionary *storeOptions;
+    if (@available(iOS 11.0, macOS 10.13, tvOS 11.0, *)) {
+        
+        storeOptions = @{ NSSQLitePragmasOption: @{ @"journal_mode": @"WAL" },
+                          NSBinaryStoreInsecureDecodingCompatibilityOption: @YES };
+    }
+    else {
+        
+        storeOptions = @{ NSSQLitePragmasOption: @{ @"journal_mode": @"WAL" }};
+    }
+    XCTAssertEqualObjects(sqliteStorage.storeOptions, storeOptions);
    XCTAssertNil(sqliteError);
 }

--- a/CoreStoreTests/ConvenienceTests.swift
+++ b/CoreStoreTests/ConvenienceTests.swift
@@ -2,7 +2,7 @@
 //  ConvenienceTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -29,7 +29,7 @@ import CoreStore

 // MARK: - ConvenienceTests

-@available(OSX 10.12, *)
+@available(macOS 10.12, *)
 class ConvenienceTests: BaseTestCase {
    
    @objc
--- a/CoreStoreTests/DynamicModelTests.swift
+++ b/CoreStoreTests/DynamicModelTests.swift
@@ -2,7 +2,7 @@
 //  DynamicModelTests.swift
 //  CoreStore
 //
-//  Copyright © 2017 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -28,11 +28,12 @@ import XCTest
@testable
 import CoreStore

-#if os(OSX)
+#if os(macOS)
    typealias Color = NSColor
+
 #else
-    
    typealias Color = UIColor
+
 #endif

 class Animal: CoreStoreObject {
@@ -70,8 +71,13 @@ class Person: CoreStoreObject {
        customGetter: Person.getDisplayName(_:),
        affectedByKeyPaths: Person.keyPathsAffectingDisplayName()
    )
+
+    let spouse = Relationship.ToOne<Person>("spouse")
    
    let pets = Relationship.ToManyUnordered<Animal>("pets", inverse: { $0.master })
+
+    private let _spouse = Relationship.ToOne<Person>("_spouseInverse", inverse: { $0.spouse })
+
    
    private static func setTitle(_ partialObject: PartialObject<Person>, _ newValue: String) {
        
@@ -126,7 +132,7 @@ class DynamicModelTests: BaseTestDataTestCase {
                versionLock: [
                    "Animal": [0x1b59d511019695cf, 0xdeb97e86c5eff179, 0x1cfd80745646cb3, 0x4ff99416175b5b9a],
                    "Dog": [0xe3f0afeb109b283a, 0x29998d292938eb61, 0x6aab788333cfc2a3, 0x492ff1d295910ea7],
-                    "Person": [0x66d8bbfd8b21561f, 0xcecec69ecae3570f, 0xc4b73d71256214ef, 0x89b99bfe3e013e8b]
+                    "Person": [0x2831cf046084d96d, 0xbe19b13ace54641, 0x635a082728b0f6f0, 0x3d4ef2dd4b74a87c]
                ]
            )
        )
@@ -134,7 +140,7 @@ class DynamicModelTests: BaseTestDataTestCase {
            
            let k1 = String(keyPath: \Animal.species)
            XCTAssertEqual(k1, "species")
-            
+
            let k2 = String(keyPath: \Dog.species)
            XCTAssertEqual(k2, "species")
            
@@ -143,6 +149,9 @@ class DynamicModelTests: BaseTestDataTestCase {
            
            let updateDone = self.expectation(description: "update-done")
            let fetchDone = self.expectation(description: "fetch-done")
+            let willSetPriorObserverDone = self.expectation(description: "willSet-observe-prior-done")
+            let willSetNotPriorObserverDone = self.expectation(description: "willSet-observe-notPrior-done")
+            let didSetObserverDone = self.expectation(description: "didSet-observe-done")
            stack.perform(
                asynchronous: { (transaction) in
                    
@@ -160,9 +169,42 @@ class DynamicModelTests: BaseTestDataTestCase {
                    XCTAssertEqual(dog.species.value, "Swift")
                    XCTAssertEqual(dog.nickname.value, nil)
                    XCTAssertEqual(dog.age.value, 1)
+
+                    let didSetObserver = dog.species.observe(options: [.new, .old]) { (object, change) in
+
+                        XCTAssertEqual(object, dog)
+                        XCTAssertEqual(change.kind, .setting)
+                        XCTAssertEqual(change.newValue, "Dog")
+                        XCTAssertEqual(change.oldValue, "Swift")
+                        XCTAssertFalse(change.isPrior)
+                        XCTAssertEqual(object.species.value, "Dog")
+                        didSetObserverDone.fulfill()
+                    }
+                    let willSetObserver = dog.species.observe(options: [.new, .old, .prior]) { (object, change) in
+
+                        XCTAssertEqual(object, dog)
+                        XCTAssertEqual(change.kind, .setting)
+                        XCTAssertEqual(change.oldValue, "Swift")
+
+                        if change.isPrior {
+
+                            XCTAssertNil(change.newValue)
+                            XCTAssertEqual(object.species.value, "Swift")
+                            willSetPriorObserverDone.fulfill()
+                        }
+                        else {
+
+                            XCTAssertEqual(change.newValue, "Dog")
+                            XCTAssertEqual(object.species.value, "Dog")
+                            willSetNotPriorObserverDone.fulfill()
+                        }
+                    }
                    
                    dog.species .= "Dog"
                    XCTAssertEqual(dog.species.value, "Dog")
+
+                    didSetObserver.invalidate()
+                    willSetObserver.invalidate()
                    
                    dog.nickname .= "Spot"
                    XCTAssertEqual(dog.nickname.value, "Spot")
@@ -171,7 +213,7 @@ class DynamicModelTests: BaseTestDataTestCase {
                    XCTAssertTrue(person.pets.value.isEmpty)
                    
                    XCTAssertEqual(
-                        type(of: person.rawObject!).keyPathsForValuesAffectingValue(forKey: "displayName"),
+                        cs_dynamicType(of: person.rawObject!).keyPathsForValuesAffectingValue(forKey: "displayName"),
                        ["title", "name"]
                    )
                    
@@ -212,51 +254,54 @@ class DynamicModelTests: BaseTestDataTestCase {
                    let p1 = Where<Animal>({ $0.species == "Sparrow" })
                    XCTAssertEqual(p1.predicate, NSPredicate(format: "%K == %@", "species", "Sparrow"))
                    
-                    let bird = transaction.fetchOne(From<Animal>(), p1)
+                    let bird = try transaction.fetchOne(From<Animal>(), p1)
                    XCTAssertNotNil(bird)
                    XCTAssertEqual(bird!.species.value, "Sparrow")
                    
                    let p2 = Where<Dog>({ $0.nickname == "Spot" })
                    XCTAssertEqual(p2.predicate, NSPredicate(format: "%K == %@", "nickname", "Spot"))
                    
-                    let dog = transaction.fetchOne(From<Dog>().where(\.nickname == "Spot"))
+                    let dog = try transaction.fetchOne(From<Dog>().where(\.nickname == "Spot"))
                    XCTAssertNotNil(dog)
                    XCTAssertEqual(dog!.nickname.value, "Spot")
                    XCTAssertEqual(dog!.species.value, "Dog")
                    
-                    let person = transaction.fetchOne(From<Person>())
+                    let person = try transaction.fetchOne(From<Person>())
                    XCTAssertNotNil(person)
                    XCTAssertEqual(person!.pets.value.first, dog)
                    
                    let p3 = Where<Dog>({ $0.age == 10 })
                    XCTAssertEqual(p3.predicate, NSPredicate(format: "%K == %d", "age", 10))
+
+                    let totalAge = try transaction.queryValue(From<Dog>().select(Int.self, .sum(\Dog.age)))
+                    XCTAssertEqual(totalAge, 1)
                    
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>()
-                            .where(\Animal.species == "Dog" && \.age == 10)
+                            .where(\Animal.species == "Dog" && \Dog.age == 10)
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>()
-                            .where(\.age == 10 && \Animal.species == "Dog")
+                            .where(\Dog.age == 10 && \Animal.species == "Dog")
                            .orderBy(.ascending({ $0.species }))
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        Where<Dog>({ $0.age > 10 && $0.age <= 15 })
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        Where<Dog>({ $0.species == "Dog" && $0.age == 10 })
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        Where<Dog>({ $0.age == 10 && $0.species == "Dog" })
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        Where<Dog>({ $0.age > 10 && $0.age <= 15 })
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        (\Dog.age > 10 && \Dog.age <= 15)
                    )
--- a/CoreStoreTests/ErrorTests.swift
+++ b/CoreStoreTests/ErrorTests.swift
@@ -2,7 +2,7 @@
 //  ErrorTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
--- a/CoreStoreTests/FetchTests.swift
+++ b/CoreStoreTests/FetchTests.swift
--- a/CoreStoreTests/FromTests.swift
+++ b/CoreStoreTests/FromTests.swift
@@ -2,7 +2,7 @@
 //  FromTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -74,33 +74,31 @@ final class FromTests: BaseTestCase {
                
                let from = From<TestEntity1>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                try from.applyToFetchRequest(request, context: dataStack.mainContext)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["PF_DEFAULT_CONFIGURATION_NAME"])
            }
            do {
                
                let from = From<TestEntity1>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
        }
@@ -115,102 +113,98 @@ final class FromTests: BaseTestCase {
                
                let from = From<TestEntity1>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
-                
+
                let from = From<TestEntity1>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
                
                let from = From<TestEntity1>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
        }
@@ -225,99 +219,96 @@ final class FromTests: BaseTestCase {
                
                let from = From<TestEntity1>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(Set(affectedConfigurations), ["PF_DEFAULT_CONFIGURATION_NAME", "Config1"] as Set)
            }
            do {
                
                let from = From<TestEntity1>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
                
                let from = From<TestEntity1>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["PF_DEFAULT_CONFIGURATION_NAME"])
            }
            do {
                
                let from = From<TestEntity2>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
        }
@@ -332,96 +323,94 @@ final class FromTests: BaseTestCase {
                
                let from = From<TestEntity1>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
                
                let from = From<TestEntity1>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
                
                let from = From<TestEntity1>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config2"])
            }
            do {
                
                let from = From<TestEntity2>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config2"])
            }
        }
--- a/CoreStoreTests/GroupByTests.swift
+++ b/CoreStoreTests/GroupByTests.swift
@@ -2,7 +2,7 @@
 //  GroupByTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -68,8 +68,8 @@ final class GroupByTests: BaseTestCase {
            
            let groupBy = GroupBy<NSManagedObject>(#keyPath(TestEntity1.testString))
            
-            let request = CoreStoreFetchRequest()
-            _ = From<TestEntity1>().applyToFetchRequest(request, context: dataStack.mainContext)
+            let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+            try From<TestEntity1>().applyToFetchRequest(request, context: dataStack.mainContext)
            groupBy.applyToFetchRequest(request)
            
            XCTAssertNotNil(request.propertiesToGroupBy)
--- a/CoreStoreTests/ImportTests.swift
+++ b/CoreStoreTests/ImportTests.swift
@@ -2,7 +2,7 @@
 //  ImportTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -95,7 +95,7 @@ class ImportTests: BaseTestDataTestCase {
                            ]
                        )
                        XCTAssertNil(object)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 0)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 0)
                    }
                )
            }
@@ -103,7 +103,7 @@ class ImportTests: BaseTestDataTestCase {
                
                XCTFail()
            }
-            XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
+            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
        }
    }
    
@@ -137,9 +137,9 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestInsertError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                            
-                            let object = transaction.fetchOne(From<TestEntity1>())
+                            let object = try transaction.fetchOne(From<TestEntity1>())
                            XCTAssertNotNil(object)
                            XCTAssertNil(object?.testEntityID)
                            XCTAssertNil(object?.testBoolean)
@@ -182,7 +182,7 @@ class ImportTests: BaseTestDataTestCase {
                            ]
                        )
                        XCTAssertNotNil(object)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                        XCTAssertNil(object?.testEntityID)
                        XCTAssertEqual(object?.testBoolean, NSNumber(value: true))
                        XCTAssertEqual(object?.testNumber, NSNumber(value: 1))
@@ -202,7 +202,7 @@ class ImportTests: BaseTestDataTestCase {
                                #keyPath(TestEntity1.testDate): self.dateFormatter.date(from: "2000-01-02T00:00:00Z")!
                            ]
                        )
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                        XCTAssertNil(object?.testEntityID)
                        XCTAssertEqual(object?.testBoolean, NSNumber(value: false))
                        XCTAssertEqual(object?.testNumber, NSNumber(value: 2))
@@ -254,7 +254,7 @@ class ImportTests: BaseTestDataTestCase {
                            sourceArray: sourceArray
                        )
                        XCTAssertEqual(objects.count, 1)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                        
                        let object = objects[0]
                        let dictionary = sourceArray[1]
@@ -316,9 +316,9 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestInsertError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                            
-                            let object = transaction.fetchOne(From<TestEntity1>())
+                            let object = try transaction.fetchOne(From<TestEntity1>())
                            XCTAssertNotNil(object)
                            XCTAssertNil(object?.testEntityID)
                            XCTAssertNil(object?.testBoolean)
@@ -372,7 +372,7 @@ class ImportTests: BaseTestDataTestCase {
                            sourceArray: sourceArray
                        )
                        XCTAssertEqual(objects.count, sourceArray.count)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 2)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 2)
                        
                        for i in 0 ..< sourceArray.count {
                            
@@ -424,7 +424,7 @@ class ImportTests: BaseTestDataTestCase {
                                ]
                            )
                            XCTAssertNil(object)
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 5)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 5)
                        }
                        do {
                            
@@ -442,20 +442,19 @@ class ImportTests: BaseTestDataTestCase {
                                ]
                            )
                            XCTAssertNil(object)
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 5)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 5)
                            
-                            let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
-                            XCTAssertNotNil(existingObjects)
-                            XCTAssertEqual(existingObjects?.count, 1)
+                            let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                            XCTAssertEqual(existingObjects.count, 1)
                            
-                            let existingObject = existingObjects?[0]
-                            XCTAssertEqual(existingObject?.testEntityID, NSNumber(value: 105))
-                            XCTAssertEqual(existingObject?.testBoolean, NSNumber(value: true))
-                            XCTAssertEqual(existingObject?.testNumber, NSNumber(value: 5))
-                            XCTAssertEqual(existingObject?.testDecimal, NSDecimalNumber(string: "5"))
-                            XCTAssertEqual(existingObject?.testString, "nil:TestEntity1:5")
-                            XCTAssertEqual(existingObject?.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
-                            XCTAssertEqual(existingObject?.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
+                            let existingObject = existingObjects[0]
+                            XCTAssertEqual(existingObject.testEntityID, NSNumber(value: 105))
+                            XCTAssertEqual(existingObject.testBoolean, NSNumber(value: true))
+                            XCTAssertEqual(existingObject.testNumber, NSNumber(value: 5))
+                            XCTAssertEqual(existingObject.testDecimal, NSDecimalNumber(string: "5"))
+                            XCTAssertEqual(existingObject.testString, "nil:TestEntity1:5")
+                            XCTAssertEqual(existingObject.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
+                            XCTAssertEqual(existingObject.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
                        }
                    }
                )
@@ -504,7 +503,7 @@ class ImportTests: BaseTestDataTestCase {
                        )
                        
                        XCTAssertEqual(objects.count, 1)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                        
                        let object = objects[0]
                        let dictionary = sourceArray[1]
@@ -618,9 +617,9 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestInsertError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                            
-                            let object = transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
+                            let object = try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
                            XCTAssertNotNil(object)
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 106))
                            XCTAssertNil(object?.testBoolean)
@@ -657,21 +656,19 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestUpdateError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                            
-                            let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
-                            XCTAssertNotNil(existingObjects)
-                            XCTAssertEqual(existingObjects?.count, 1)
+                            let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                            XCTAssertEqual(existingObjects.count, 1)
                            
-                            let existingObject = existingObjects?[0]
-                            XCTAssertNotNil(existingObject)
-                            XCTAssertEqual(existingObject?.testEntityID, NSNumber(value: 105))
-                            XCTAssertEqual(existingObject?.testBoolean, NSNumber(value: true))
-                            XCTAssertEqual(existingObject?.testNumber, NSNumber(value: 5))
-                            XCTAssertEqual(existingObject?.testDecimal, NSDecimalNumber(string: "5"))
-                            XCTAssertEqual(existingObject?.testString, "nil:TestEntity1:5")
-                            XCTAssertEqual(existingObject?.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
-                            XCTAssertEqual(existingObject?.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
+                            let existingObject = existingObjects[0]
+                            XCTAssertEqual(existingObject.testEntityID, NSNumber(value: 105))
+                            XCTAssertEqual(existingObject.testBoolean, NSNumber(value: true))
+                            XCTAssertEqual(existingObject.testNumber, NSNumber(value: 5))
+                            XCTAssertEqual(existingObject.testDecimal, NSDecimalNumber(string: "5"))
+                            XCTAssertEqual(existingObject.testString, "nil:TestEntity1:5")
+                            XCTAssertEqual(existingObject.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
+                            XCTAssertEqual(existingObject.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
                        }
                        self.checkExpectationsImmediately()
                    }
@@ -710,7 +707,7 @@ class ImportTests: BaseTestDataTestCase {
                                ]
                            )
                            XCTAssertNotNil(object)
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                            
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 106))
                            XCTAssertEqual(object?.testBoolean, NSNumber(value: true))
@@ -735,7 +732,7 @@ class ImportTests: BaseTestDataTestCase {
                                    ]
                            )
                            XCTAssertNotNil(object)
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                            
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 106))
                            XCTAssertEqual(object?.testBoolean, NSNumber(value: false))
@@ -745,11 +742,10 @@ class ImportTests: BaseTestDataTestCase {
                            XCTAssertEqual(object?.testData, ("nil:TestEntity1:7" as NSString).data(using: String.Encoding.utf8.rawValue)!)
                            XCTAssertEqual(object?.testDate, self.dateFormatter.date(from: "2000-01-07T00:00:00Z")!)
                            
-                            let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
-                            XCTAssertNotNil(existingObjects)
-                            XCTAssertEqual(existingObjects?.count, 1)
+                            let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
+                            XCTAssertEqual(existingObjects.count, 1)
                            
-                            let existingObject = existingObjects?[0]
+                            let existingObject = existingObjects[0]
                            XCTAssertEqual(existingObject, object)
                        }
                    }
@@ -799,7 +795,7 @@ class ImportTests: BaseTestDataTestCase {
                            sourceArray: sourceArray
                        )
                        XCTAssertEqual(objects.count, 1)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                        
                        let object = objects[0]
                        let dictionary = sourceArray[1]
@@ -864,10 +860,10 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestIDError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 5)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 5)
                            
-                            XCTAssertNil(transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106)))
-                            XCTAssertNil(transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 107)))
+                            XCTAssertNil(try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106)))
+                            XCTAssertNil(try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 107)))
                        }
                        transaction.unsafeContext().reset()
                        self.checkExpectationsImmediately()
@@ -910,7 +906,7 @@ class ImportTests: BaseTestDataTestCase {
                            
                            errorExpectation.fulfill()
                            
-                            let object = transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
+                            let object = try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
                            XCTAssertNotNil(object)
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 106))
                            XCTAssertNil(object?.testBoolean)
@@ -951,9 +947,9 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestUpdateError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 5)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 5)
                            
-                            let object = transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                            let object = try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
                            XCTAssertNotNil(object)
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 105))
                            XCTAssertEqual(object?.testBoolean, NSNumber(value: true))
@@ -963,11 +959,10 @@ class ImportTests: BaseTestDataTestCase {
                            XCTAssertEqual(object?.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
                            XCTAssertEqual(object?.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
                            
-                            let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
-                            XCTAssertNotNil(existingObjects)
-                            XCTAssertEqual(existingObjects?.count, 1)
+                            let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                            XCTAssertEqual(existingObjects.count, 1)
                            
-                            let existingObject = existingObjects?[0]
+                            let existingObject = existingObjects[0]
                            XCTAssertEqual(existingObject, object)
                        }
                        transaction.context.reset()
@@ -1018,7 +1013,7 @@ class ImportTests: BaseTestDataTestCase {
                            sourceArray: sourceArray
                        )
                        XCTAssertEqual(objects.count, sourceArray.count)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                        for i in 0 ..< sourceArray.count {
                            
                            let object = objects[i]
@@ -1032,11 +1027,10 @@ class ImportTests: BaseTestDataTestCase {
                            XCTAssertEqual(object.testData, dictionary[(#keyPath(TestEntity1.testData))] as? Data)
                            XCTAssertEqual(object.testDate, dictionary[(#keyPath(TestEntity1.testDate))] as? Date)
                        }
-                        let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
-                        XCTAssertNotNil(existingObjects)
-                        XCTAssertEqual(existingObjects?.count, 1)
+                        let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                        XCTAssertEqual(existingObjects.count, 1)
                        
-                        let existingObject = existingObjects?[0]
+                        let existingObject = existingObjects[0]
                        XCTAssertEqual(existingObject, objects[0])
                    }
                )
--- a/CoreStoreTests/Info.plist
+++ b/CoreStoreTests/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>BNDL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
+	<string>6.2.1</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
--- a/CoreStoreTests/IntoTests.swift
+++ b/CoreStoreTests/IntoTests.swift
@@ -2,7 +2,7 @@
 //  IntoTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
--- a/CoreStoreTests/ListObserverTests.swift
+++ b/CoreStoreTests/ListObserverTests.swift
@@ -2,7 +2,7 @@
 //  ListObserverTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -31,7 +31,7 @@ import CoreStore

 // MARK: - ListObserverTests

-@available(OSX 10.12, *)
+@available(macOS 10.12, *)
 class ListObserverTests: BaseTestDataTestCase {
    
    @objc
@@ -76,7 +76,7 @@ class ListObserverTests: BaseTestDataTestCase {
                    XCTAssertEqual(
                        ((note.userInfo as NSDictionary?) ?? [:]),
                        [
-                            "sectionInfo": monitor.sectionInfoAtIndex(0),
+                            "sectionInfo": monitor.sectionInfo(at: 0),
                            "sectionIndex": 0
                        ] as NSDictionary
                    )
@@ -178,9 +178,9 @@ class ListObserverTests: BaseTestDataTestCase {
            XCTAssertTrue(monitor.hasSections())
            XCTAssertEqual(monitor.numberOfSections(), 2)
            XCTAssertTrue(monitor.hasObjects())
-            XCTAssertTrue(monitor.hasObjectsInSection(0))
-            XCTAssertEqual(monitor.numberOfObjectsInSection(0), 2)
-            XCTAssertEqual(monitor.numberOfObjectsInSection(1), 3)
+            XCTAssertTrue(monitor.hasObjects(in: 0))
+            XCTAssertEqual(monitor.numberOfObjects(in: 0), 2)
+            XCTAssertEqual(monitor.numberOfObjects(in: 1), 3)
            
            var events = 0
            
@@ -268,7 +268,7 @@ class ListObserverTests: BaseTestDataTestCase {
            stack.perform(
                asynchronous: { (transaction) -> Bool in
                    
-                    if let object = transaction.fetchOne(
+                    if let object = try transaction.fetchOne(
                        From<TestEntity1>(),
                        Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 101)) {
                        
@@ -282,7 +282,7 @@ class ListObserverTests: BaseTestDataTestCase {
                        
                        XCTFail()
                    }
-                    if let object = transaction.fetchOne(
+                    if let object = try transaction.fetchOne(
                        From<TestEntity1>(),
                        Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 102)) {
                        
@@ -394,7 +394,7 @@ class ListObserverTests: BaseTestDataTestCase {
            stack.perform(
                asynchronous: { (transaction) -> Bool in
                    
-                    if let object = transaction.fetchOne(
+                    if let object = try transaction.fetchOne(
                        From<TestEntity1>(),
                        Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 102)) {
                        
@@ -526,7 +526,7 @@ class ListObserverTests: BaseTestDataTestCase {
            stack.perform(
                asynchronous: { (transaction) -> Bool in
                    
-                    let count = transaction.deleteAll(
+                    let count = try transaction.deleteAll(
                        From<TestEntity1>(),
                        Where<TestEntity1>(#keyPath(TestEntity1.testBoolean), isEqualTo: false)
                    )
@@ -551,7 +551,7 @@ class ListObserverTests: BaseTestDataTestCase {

 // MARK: TestListObserver

-@available(OSX 10.12, *)
+@available(macOS 10.12, *)
 class TestListObserver: ListSectionObserver {
    
    // MARK: ListObserver
--- a/CoreStoreTests/MigrationChainTests.swift
+++ b/CoreStoreTests/MigrationChainTests.swift
@@ -2,7 +2,7 @@
 //  MigrationChainTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
--- a/CoreStoreTests/Model.xcdatamodeld/Model.xcdatamodel/contents
+++ b/CoreStoreTests/Model.xcdatamodeld/Model.xcdatamodel/contents
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="11759" systemVersion="16C67" minimumToolsVersion="Xcode 4.3" sourceLanguage="Objective-C" userDefinedModelVersionIdentifier="">
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="14460.32" systemVersion="17G2307" minimumToolsVersion="Xcode 4.3" sourceLanguage="Objective-C" userDefinedModelVersionIdentifier="">
    <entity name="TestEntity1AAA" representedClassName="CoreStoreTests.TestEntity1" syncable="YES">
        <attribute name="testBoolean" optional="YES" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
        <attribute name="testData" optional="YES" attributeType="Binary" syncable="YES"/>
@@ -9,6 +9,8 @@
        <attribute name="testNil" optional="YES" attributeType="String" syncable="YES"/>
        <attribute name="testNumber" optional="YES" attributeType="Integer 32" usesScalarValueType="NO" syncable="YES"/>
        <attribute name="testString" optional="YES" attributeType="String" syncable="YES"/>
+        <relationship name="testToManyUnordered" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="TestEntity1AAA" inverseName="testToOne" inverseEntity="TestEntity1AAA" syncable="YES"/>
+        <relationship name="testToOne" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="TestEntity1AAA" inverseName="testToManyUnordered" inverseEntity="TestEntity1AAA" syncable="YES"/>
    </entity>
    <entity name="TestEntity2" representedClassName="CoreStoreTests.TestEntity2" syncable="YES">
        <attribute name="testBoolean" optional="YES" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
@@ -19,6 +21,8 @@
        <attribute name="testNil" optional="YES" attributeType="String" syncable="YES"/>
        <attribute name="testNumber" optional="YES" attributeType="Integer 32" usesScalarValueType="NO" syncable="YES"/>
        <attribute name="testString" optional="YES" attributeType="String" syncable="YES"/>
+        <relationship name="testToManyOrdered" optional="YES" toMany="YES" deletionRule="Nullify" ordered="YES" destinationEntity="TestEntity2" inverseName="testToOne" inverseEntity="TestEntity2" syncable="YES"/>
+        <relationship name="testToOne" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="TestEntity2" inverseName="testToManyOrdered" inverseEntity="TestEntity2" syncable="YES"/>
    </entity>
    <configuration name="Config1">
        <memberEntity name="TestEntity1AAA"/>
@@ -27,7 +31,7 @@
        <memberEntity name="TestEntity2"/>
    </configuration>
    <elements>
-        <element name="TestEntity1AAA" positionX="-63" positionY="-18" width="128" height="165"/>
-        <element name="TestEntity2" positionX="-63" positionY="9" width="128" height="165"/>
+        <element name="TestEntity1AAA" positionX="-63" positionY="-18" width="128" height="195"/>
+        <element name="TestEntity2" positionX="-63" positionY="9" width="128" height="195"/>
    </elements>
 </model>
--- a/CoreStoreTests/ObjectObserverTests.swift
+++ b/CoreStoreTests/ObjectObserverTests.swift
@@ -2,7 +2,7 @@
 //  ObjectObserverTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -31,7 +31,7 @@ import CoreStore

 // MARK: - ObjectObserverTests

-@available(OSX 10.12, *)
+@available(macOS 10.12, *)
 class ObjectObserverTests: BaseTestDataTestCase {
    
    @objc
@@ -41,7 +41,7 @@ class ObjectObserverTests: BaseTestDataTestCase {
            
            self.prepareTestDataForStack(stack)
            
-            guard let object = stack.fetchOne(
+            guard let object = try stack.fetchOne(
                From<TestEntity1>(),
                Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 101)) else {
                    
@@ -138,7 +138,7 @@ class ObjectObserverTests: BaseTestDataTestCase {
            
            self.prepareTestDataForStack(stack)
            
-            guard let object = stack.fetchOne(
+            guard let object = try stack.fetchOne(
                From<TestEntity1>(),
                Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 101)) else {
                    
@@ -203,7 +203,7 @@ class ObjectObserverTests: BaseTestDataTestCase {

 // MARK: TestObjectObserver

-@available(OSX 10.12, *)
+@available(macOS 10.12, *)
 class TestObjectObserver: ObjectObserver {
    
    typealias ObjectEntityType = TestEntity1
--- a/CoreStoreTests/OrderByTests.swift
+++ b/CoreStoreTests/OrderByTests.swift
@@ -2,7 +2,7 @@
 //  OrderByTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -179,7 +179,7 @@ final class OrderByTests: XCTestCase {
    dynamic func test_ThatOrderByClauses_ApplyToFetchRequestsCorrectly() {
        
        let orderBy = OrderBy<NSManagedObject>(.ascending("key"))
-        let request = CoreStoreFetchRequest()
+        let request = CoreStoreFetchRequest<NSFetchRequestResult>()
        orderBy.applyToFetchRequest(request)
        XCTAssertNotNil(request.sortDescriptors)
        XCTAssertEqual(request.sortDescriptors ?? [], orderBy.sortDescriptors)
--- a/CoreStoreTests/QueryTests.swift
+++ b/CoreStoreTests/QueryTests.swift
@@ -2,7 +2,7 @@
 //  QueryTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -47,7 +47,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(#keyPath(TestEntity1.testBoolean)),
                    queryClauses
@@ -57,7 +57,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -67,7 +67,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -77,7 +77,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -87,7 +87,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -97,7 +97,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -107,7 +107,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -117,7 +117,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -127,7 +127,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -137,7 +137,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(#keyPath(TestEntity1.testDecimal)),
                    queryClauses
@@ -147,7 +147,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(#keyPath(TestEntity1.testString)),
                    queryClauses
@@ -157,7 +157,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(#keyPath(TestEntity1.testString)),
                    queryClauses
@@ -167,7 +167,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(#keyPath(TestEntity1.testData)),
                    queryClauses
@@ -177,7 +177,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(#keyPath(TestEntity1.testData)),
                    queryClauses
@@ -187,7 +187,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(#keyPath(TestEntity1.testDate)),
                    queryClauses
@@ -197,7 +197,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(#keyPath(TestEntity1.testDate)),
                    queryClauses
@@ -207,7 +207,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(#keyPath(TestEntity1.testDate)),
                    queryClauses
@@ -232,7 +232,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.average(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -242,7 +242,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -252,7 +252,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -262,7 +262,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -272,7 +272,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -282,7 +282,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -292,7 +292,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -302,7 +302,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -312,7 +312,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -322,7 +322,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.average(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -332,7 +332,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.average(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -341,7 +341,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.average(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -350,7 +350,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.average(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -359,7 +359,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.average(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -368,7 +368,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.average(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -377,7 +377,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.average(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -386,7 +386,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(#keyPath(TestEntity1.testEntityID)),
                    queryClauses
@@ -410,7 +410,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.count(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -420,7 +420,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -430,7 +430,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -440,7 +440,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -450,7 +450,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -460,7 +460,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -470,7 +470,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -480,7 +480,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -490,7 +490,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -500,7 +500,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.count(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -509,7 +509,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.count(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -518,7 +518,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.count(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -527,7 +527,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.count(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -536,7 +536,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.count(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -545,7 +545,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.count(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -554,7 +554,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.count(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -563,7 +563,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.count(#keyPath(TestEntity1.testEntityID))),
                    queryClauses
@@ -587,7 +587,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.maximum(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -597,7 +597,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -607,7 +607,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -617,7 +617,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -627,7 +627,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -637,7 +637,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -647,7 +647,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -657,7 +657,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -667,7 +667,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -677,7 +677,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.maximum(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -687,7 +687,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.maximum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -697,7 +697,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.maximum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -707,7 +707,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.maximum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -717,7 +717,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.maximum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -727,7 +727,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.maximum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -737,7 +737,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.maximum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -747,7 +747,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.maximum(#keyPath(TestEntity1.testEntityID))),
                    queryClauses
@@ -771,7 +771,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.minimum(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -781,7 +781,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -791,7 +791,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -801,7 +801,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -811,7 +811,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -821,7 +821,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -831,7 +831,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -841,7 +841,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -851,7 +851,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -861,7 +861,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.minimum(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -871,7 +871,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.minimum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -881,7 +881,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.minimum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -891,7 +891,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.minimum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -901,7 +901,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.minimum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -911,7 +911,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.minimum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -921,7 +921,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.minimum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -931,7 +931,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.minimum(#keyPath(TestEntity1.testEntityID))),
                    queryClauses
@@ -955,7 +955,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.sum(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -965,7 +965,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -975,7 +975,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -985,7 +985,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -995,7 +995,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1005,7 +1005,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1015,7 +1015,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1025,7 +1025,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1035,7 +1035,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1045,7 +1045,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.sum(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -1055,7 +1055,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.sum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -1064,7 +1064,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.sum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -1073,7 +1073,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.sum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -1082,7 +1082,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.sum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -1091,7 +1091,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.sum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -1100,7 +1100,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.sum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -1109,7 +1109,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.sum(#keyPath(TestEntity1.testEntityID))),
                    queryClauses
@@ -1133,7 +1133,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.objectID()),
                    queryClauses
@@ -1142,7 +1142,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.objectID()),
                    queryClauses
@@ -1151,7 +1151,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.objectID()),
                    queryClauses
@@ -1160,7 +1160,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.objectID()),
                    queryClauses
@@ -1169,7 +1169,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.objectID()),
                    queryClauses
@@ -1178,7 +1178,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.objectID()),
                    queryClauses
@@ -1187,7 +1187,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.objectID()),
                    queryClauses
@@ -1196,7 +1196,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.objectID()),
                    queryClauses
@@ -1205,7 +1205,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.objectID()),
                    queryClauses
@@ -1214,7 +1214,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.objectID()),
                    queryClauses
@@ -1223,7 +1223,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.objectID()),
                    queryClauses
@@ -1232,7 +1232,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.objectID()),
                    queryClauses
@@ -1241,7 +1241,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.objectID()),
                    queryClauses
@@ -1250,7 +1250,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.objectID()),
                    queryClauses
@@ -1259,7 +1259,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.objectID()),
                    queryClauses
@@ -1268,7 +1268,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.objectID()),
                    queryClauses
@@ -1277,7 +1277,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.objectID()),
                    queryClauses
@@ -1302,7 +1302,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let values = stack.queryAttributes(
+                let values = try stack.queryAttributes(
                    from,
                    Select<TestEntity1, NSDictionary>(
                        #keyPath(TestEntity1.testBoolean),
@@ -1353,7 +1353,7 @@ class QueryTests: BaseTestDataTestCase {
            let queryClauses: [QueryClause] = []
            do {
                
-                let values = stack.queryAttributes(
+                let values = try stack.queryAttributes(
                    from,
                    Select<TestEntity1, NSDictionary>(
                        .sum(#keyPath(TestEntity1.testBoolean)),
@@ -1380,7 +1380,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let values = stack.queryAttributes(
+                let values = try stack.queryAttributes(
                    from,
                    Select(
                        .sum(#keyPath(TestEntity1.testBoolean), as: "testSum"),
--- a/CoreStoreTests/SectionByTests.swift
+++ b/CoreStoreTests/SectionByTests.swift
@@ -2,7 +2,7 @@
 //  SectionByTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -31,7 +31,7 @@ import CoreStore

 //MARK: - SectionByTests

-@available(OSX 10.12, *)
+@available(macOS 10.12, *)
 final class SectionByTests: XCTestCase {
    
    @objc
--- a/CoreStoreTests/SelectTests.swift
+++ b/CoreStoreTests/SelectTests.swift
@@ -2,7 +2,7 @@
 //  SelectTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
--- a/CoreStoreTests/SetupTests.swift
+++ b/CoreStoreTests/SetupTests.swift
@@ -2,7 +2,7 @@
 //  SetupTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -330,7 +330,14 @@ class SetupTests: BaseTestDataTestCase {
                    xcodeModelName: "Model",
                    bundle: Bundle(for: type(of: self))
                )
-                try! stack.addStorageAndWait(sqliteStore)
+                try! stack.addStorageAndWait(
+                    SQLiteStore.legacy(
+                        fileName: sqliteStore.fileURL.lastPathComponent,
+                        configuration: sqliteStore.configuration,
+                        migrationMappingProviders: sqliteStore.migrationMappingProviders,
+                        localStorageOptions: .recreateStoreOnModelMismatch
+                    )
+                )
                self.prepareTestDataForStack(stack)
            }
            XCTAssertTrue(fileManager.fileExists(atPath: sqliteStore.fileURL.path))
--- a/CoreStoreTests/StorageInterfaceTests.swift
+++ b/CoreStoreTests/StorageInterfaceTests.swift
@@ -2,7 +2,7 @@
 //  StorageInterfaceTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -83,7 +83,21 @@ final class StorageInterfaceTests: XCTestCase {
        let store = SQLiteStore()
        XCTAssertEqual(type(of: store).storeType, NSSQLiteStoreType)
        XCTAssertNil(store.configuration)
-        XCTAssertEqual(store.storeOptions as NSDictionary?, [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary)
+        if #available(iOS 11.0, macOS 10.13, tvOS 11.0, *) {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"],
+                 NSBinaryStoreInsecureDecodingCompatibilityOption: true] as NSDictionary
+            )
+        }
+        else {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary
+            )
+        }
        
        XCTAssertEqual(store.fileURL, SQLiteStore.defaultFileURL)
        XCTAssertTrue(store.migrationMappingProviders.isEmpty)
@@ -93,8 +107,8 @@ final class StorageInterfaceTests: XCTestCase {
    @objc
    dynamic func test_ThatFileURLSQLiteStores_ConfigureCorrectly() {
        
-        let fileURL = NSURL(fileURLWithPath: NSTemporaryDirectory())
-            .appendingPathComponent(NSUUID().uuidString, isDirectory: false)!
+        let fileURL = FileManager.default.temporaryDirectory
+            .appendingPathComponent(UUID().uuidString, isDirectory: false)
            .appendingPathExtension("db")
        let mappingProvider = XcodeSchemaMappingProvider(
            from: "V1", to: "V2",
@@ -109,7 +123,21 @@ final class StorageInterfaceTests: XCTestCase {
        )
        XCTAssertEqual(type(of: store).storeType, NSSQLiteStoreType)
        XCTAssertEqual(store.configuration, "config1")
-        XCTAssertEqual(store.storeOptions as NSDictionary?, [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary)
+        if #available(iOS 11.0, macOS 10.13, tvOS 11.0, *) {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"],
+                 NSBinaryStoreInsecureDecodingCompatibilityOption: true] as NSDictionary
+            )
+        }
+        else {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary
+            )
+        }
        
        XCTAssertEqual(store.fileURL, fileURL)
        XCTAssertEqual(store.migrationMappingProviders as! [XcodeSchemaMappingProvider], [mappingProvider])
@@ -132,7 +160,21 @@ final class StorageInterfaceTests: XCTestCase {
        )
        XCTAssertEqual(type(of: store).storeType, NSSQLiteStoreType)
        XCTAssertEqual(store.configuration, "config1")
-        XCTAssertEqual(store.storeOptions as NSDictionary?, [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary)
+        if #available(iOS 11.0, macOS 10.13, tvOS 11.0, *) {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"],
+                 NSBinaryStoreInsecureDecodingCompatibilityOption: true] as NSDictionary
+            )
+        }
+        else {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary
+            )
+        }
        
        XCTAssertEqual(store.fileURL.deletingLastPathComponent(), SQLiteStore.defaultRootDirectory)
        XCTAssertEqual(store.fileURL.lastPathComponent, fileName)
@@ -167,7 +209,21 @@ final class StorageInterfaceTests: XCTestCase {
        let store = SQLiteStore.legacy()
        XCTAssertEqual(type(of: store).storeType, NSSQLiteStoreType)
        XCTAssertNil(store.configuration)
-        XCTAssertEqual(store.storeOptions as NSDictionary?, [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary)
+        if #available(iOS 11.0, macOS 10.13, tvOS 11.0, *) {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"],
+                 NSBinaryStoreInsecureDecodingCompatibilityOption: true] as NSDictionary
+            )
+        }
+        else {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary
+            )
+        }
        
        XCTAssertEqual(store.fileURL, SQLiteStore.legacyDefaultFileURL)
        XCTAssertTrue(store.migrationMappingProviders.isEmpty)
@@ -190,7 +246,21 @@ final class StorageInterfaceTests: XCTestCase {
        )
        XCTAssertEqual(type(of: store).storeType, NSSQLiteStoreType)
        XCTAssertEqual(store.configuration, "config1")
-        XCTAssertEqual(store.storeOptions as NSDictionary?, [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary)
+        if #available(iOS 11.0, macOS 10.13, tvOS 11.0, *) {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"],
+                 NSBinaryStoreInsecureDecodingCompatibilityOption: true] as NSDictionary
+            )
+        }
+        else {
+            
+            XCTAssertEqual(
+                store.storeOptions as NSDictionary?,
+                [NSSQLitePragmasOption: ["journal_mode": "WAL"]] as NSDictionary
+            )
+        }
        
        XCTAssertEqual(store.fileURL.deletingLastPathComponent(), SQLiteStore.legacyDefaultRootDirectory)
        XCTAssertEqual(store.fileURL.lastPathComponent, fileName)
--- a/CoreStoreTests/TestEntities/TestEntity1.swift
+++ b/CoreStoreTests/TestEntities/TestEntity1.swift
@@ -2,7 +2,7 @@
 //  TestEntity1.swift
 //  CoreStore
 //
-//  Copyright © 2014 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -36,4 +36,6 @@ class TestEntity1: NSManagedObject {
    @NSManaged var testDecimal: NSDecimalNumber?
    @NSManaged var testData: Data?
    @NSManaged var testNil: String?
+    @NSManaged var testToOne: TestEntity1?
+    @NSManaged var testToManyUnordered: NSSet?
 }
--- a/CoreStoreTests/TestEntities/TestEntity2.swift
+++ b/CoreStoreTests/TestEntities/TestEntity2.swift
@@ -2,7 +2,7 @@
 //  TestEntity1.swift
 //  CoreStore
 //
-//  Copyright © 2014 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -36,4 +36,6 @@ class TestEntity2: NSManagedObject {
    @NSManaged var testDecimal: NSDecimalNumber?
    @NSManaged var testData: Data?
    @NSManaged var testNil: String?
+    @NSManaged var testToOne: TestEntity2?
+    @NSManaged var testToManyOrdered: NSOrderedSet?
 }
--- a/CoreStoreTests/TransactionTests.swift
+++ b/CoreStoreTests/TransactionTests.swift
@@ -2,7 +2,7 @@
 //  TransactionTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -69,9 +69,9 @@ final class TransactionTests: BaseTestCase {
                self.checkExpectationsImmediately()
                XCTAssertTrue(hasChanges)
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.fetchSource()?.unsafeContext(), stack.mainContext)
                XCTAssertEqual(object?.querySource()?.unsafeContext(), stack.mainContext)
@@ -84,14 +84,14 @@ final class TransactionTests: BaseTestCase {
            do {
                
                let updateExpectation = self.expectation(description: "update")
-                let hasChanges: Bool = try! stack.perform(
+                let hasChanges: Bool = try stack.perform(
                    synchronous: { (transaction) in
                        
                        defer {
                            
                            updateExpectation.fulfill()
                        }
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            // TODO: convert fetch methods to throwing methods
                            XCTFail() 
                            try transaction.cancel()
@@ -107,9 +107,9 @@ final class TransactionTests: BaseTestCase {
                self.checkExpectationsImmediately()
                XCTAssertTrue(hasChanges)
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1_edit")
@@ -128,7 +128,7 @@ final class TransactionTests: BaseTestCase {
                                
                                deleteExpectation.fulfill()
                            }
-                            let object = transaction.fetchOne(From<TestEntity1>())
+                            let object = try transaction.fetchOne(From<TestEntity1>())
                            transaction.delete(object)
                            return transaction.hasChanges
                        }
@@ -141,9 +141,9 @@ final class TransactionTests: BaseTestCase {
                }
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNil(object)
            }
        }
@@ -184,10 +184,10 @@ final class TransactionTests: BaseTestCase {
                }
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                
-                let object = stack.fetchOne(From<TestEntity1>("Config1"))
+                let object = try stack.fetchOne(From<TestEntity1>("Config1"))
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1")
@@ -206,7 +206,7 @@ final class TransactionTests: BaseTestCase {
                                
                                updateExpectation.fulfill()
                            }
-                            guard let object = transaction.fetchOne(From<TestEntity1>("Config1")) else {
+                            guard let object = try transaction.fetchOne(From<TestEntity1>("Config1")) else {
                                
                                XCTFail()
                                try transaction.cancel()
@@ -226,10 +226,10 @@ final class TransactionTests: BaseTestCase {
                }
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                
-                let object = stack.fetchOne(From<TestEntity1>("Config1"))
+                let object = try stack.fetchOne(From<TestEntity1>("Config1"))
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1_edit")
@@ -248,7 +248,7 @@ final class TransactionTests: BaseTestCase {
                                
                                deleteExpectation.fulfill()
                            }
-                            let object = transaction.fetchOne(From<TestEntity1>("Config1"))
+                            let object = try transaction.fetchOne(From<TestEntity1>("Config1"))
                            transaction.delete(object)
                            
                            return transaction.hasChanges
@@ -262,8 +262,8 @@ final class TransactionTests: BaseTestCase {
                }
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 0)
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
            }
        }
    }
@@ -294,17 +294,17 @@ final class TransactionTests: BaseTestCase {
                )
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNil(object)
            }
            let testDate = Date()
            do {
                
                let createExpectation = self.expectation(description: "create")
-                let dataPrepared: Void? = try? stack.perform(
-                    synchronous: { (transaction) in
+                try stack.perform(
+                    synchronous: { (transaction) -> Void in
                        
                        let object = transaction.create(Into<TestEntity1>())
                        object.testEntityID = NSNumber(value: 1)
@@ -313,10 +313,7 @@ final class TransactionTests: BaseTestCase {
                        object.testDate = testDate
                    }
                )
-                if dataPrepared != nil {
-                    
-                    createExpectation.fulfill()
-                }
+                createExpectation.fulfill()
                self.checkExpectationsImmediately()
            }
            do {
@@ -329,7 +326,7 @@ final class TransactionTests: BaseTestCase {
                            
                            updateDiscardExpectation.fulfill()
                        }
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -343,9 +340,9 @@ final class TransactionTests: BaseTestCase {
                )
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1")
@@ -362,7 +359,7 @@ final class TransactionTests: BaseTestCase {
                            
                            deleteDiscardExpectation.fulfill()
                        }
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -374,9 +371,9 @@ final class TransactionTests: BaseTestCase {
                )
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1")
@@ -387,7 +384,7 @@ final class TransactionTests: BaseTestCase {
    }
    
    
-    @available(OSX 10.12, *)
+    @available(macOS 10.12, *)
    @objc
    dynamic func test_ThatSynchronousTransactions_CanCommitWithoutWaitingForMerges() {
        
@@ -520,19 +517,26 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>())
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.fetchSource()?.unsafeContext(), stack.mainContext)
-                        XCTAssertEqual(object?.querySource()?.unsafeContext(), stack.mainContext)
-                        
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1")
-                        XCTAssertEqual(object?.testNumber, 100)
-                        XCTAssertEqual(object?.testDate, testDate)
-                        createExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+
+                            let object = try stack.fetchOne(From<TestEntity1>())
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.fetchSource()?.unsafeContext(), stack.mainContext)
+                            XCTAssertEqual(object?.querySource()?.unsafeContext(), stack.mainContext)
+
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1")
+                            XCTAssertEqual(object?.testNumber, 100)
+                            XCTAssertEqual(object?.testDate, testDate)
+                            createExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -546,7 +550,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -560,16 +564,23 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>())
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1_edit")
-                        XCTAssertEqual(object?.testNumber, 200)
-                        XCTAssertEqual(object?.testDate, Date.distantFuture)
-                        updateExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+
+                            let object = try stack.fetchOne(From<TestEntity1>())
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1_edit")
+                            XCTAssertEqual(object?.testNumber, 200)
+                            XCTAssertEqual(object?.testDate, Date.distantFuture)
+                            updateExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -583,7 +594,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        let object = transaction.fetchOne(From<TestEntity1>())
+                        let object = try transaction.fetchOne(From<TestEntity1>())
                        transaction.delete(object)
                        
                        return transaction.hasChanges
@@ -591,12 +602,19 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>())
-                        XCTAssertNil(object)
-                        deleteExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
+
+                            let object = try stack.fetchOne(From<TestEntity1>())
+                            XCTAssertNil(object)
+                            deleteExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -631,17 +649,24 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>("Config1"))
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1")
-                        XCTAssertEqual(object?.testNumber, 100)
-                        XCTAssertEqual(object?.testDate, testDate)
-                        createExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
+
+                            let object = try stack.fetchOne(From<TestEntity1>("Config1"))
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1")
+                            XCTAssertEqual(object?.testNumber, 100)
+                            XCTAssertEqual(object?.testDate, testDate)
+                            createExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -655,7 +680,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        guard let object = transaction.fetchOne(From<TestEntity1>("Config1")) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>("Config1")) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -669,17 +694,24 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>("Config1"))
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1_edit")
-                        XCTAssertEqual(object?.testNumber, 200)
-                        XCTAssertEqual(object?.testDate, Date.distantFuture)
-                        updateExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
+
+                            let object = try stack.fetchOne(From<TestEntity1>("Config1"))
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1_edit")
+                            XCTAssertEqual(object?.testNumber, 200)
+                            XCTAssertEqual(object?.testDate, Date.distantFuture)
+                            updateExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -693,7 +725,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        let object = transaction.fetchOne(From<TestEntity1>("Config1"))
+                        let object = try transaction.fetchOne(From<TestEntity1>("Config1"))
                        transaction.delete(object)
                        
                        return transaction.hasChanges
@@ -701,11 +733,21 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 0)
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
-                        
-                        deleteExpectation.fulfill()
+
+                        do {
+
+                            let configCount = try stack.fetchCount(From<TestEntity1>("Config1"))
+                            XCTAssertEqual(configCount, 0)
+
+                            let defaultCount = try stack.fetchCount(From<TestEntity1>(nil))
+                            XCTAssertEqual(defaultCount, 0)
+
+                            deleteExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -754,8 +796,8 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 0)
-                        XCTAssertNil(transaction.fetchOne(From<TestEntity1>()))
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 0)
+                        XCTAssertNil(try transaction.fetchOne(From<TestEntity1>()))
                        
                        let object = transaction.create(Into<TestEntity1>())
                        object.testEntityID = NSNumber(value: 1)
@@ -782,7 +824,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Void in
                        
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            return
@@ -811,9 +853,9 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Void in
                        
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                        
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -835,15 +877,22 @@ final class TransactionTests: BaseTestCase {
                    failure: { (error) in
                        
                        XCTAssertEqual(error, CoreStoreError.userCancelled)
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>())
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1")
-                        XCTAssertEqual(object?.testNumber, 100)
-                        XCTAssertEqual(object?.testDate, testDate)
-                        deleteDiscardExpectation.fulfill()
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+
+                            let object = try stack.fetchOne(From<TestEntity1>())
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1")
+                            XCTAssertEqual(object?.testNumber, 100)
+                            XCTAssertEqual(object?.testDate, testDate)
+                            deleteDiscardExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    }
                )
            }
@@ -878,9 +927,9 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                    
-                    let object = stack.fetchOne(From<TestEntity1>())
+                    let object = try stack.fetchOne(From<TestEntity1>())
                    XCTAssertNotNil(object)
                    XCTAssertEqual(object?.fetchSource()?.unsafeContext(), stack.mainContext)
                    XCTAssertEqual(object?.querySource()?.unsafeContext(), stack.mainContext)
@@ -897,7 +946,7 @@ final class TransactionTests: BaseTestCase {
            }
            do {
                
-                guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                    
                    XCTFail()
                    return
@@ -911,9 +960,9 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                    
-                    let object = stack.fetchOne(From<TestEntity1>())
+                    let object = try stack.fetchOne(From<TestEntity1>())
                    XCTAssertNotNil(object)
                    XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object?.testString, "string1_edit")
@@ -927,7 +976,7 @@ final class TransactionTests: BaseTestCase {
            }
            do {
                
-                let object = transaction.fetchOne(From<TestEntity1>())
+                let object = try transaction.fetchOne(From<TestEntity1>())
                transaction.delete(object)
                
                do {
@@ -935,8 +984,8 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
-                    XCTAssertNil(stack.fetchOne(From<TestEntity1>()))
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
+                    XCTAssertNil(try stack.fetchOne(From<TestEntity1>()))
                }
                catch {
                    
@@ -967,10 +1016,10 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                    
-                    let object = stack.fetchOne(From<TestEntity1>("Config1"))
+                    let object = try stack.fetchOne(From<TestEntity1>("Config1"))
                    XCTAssertNotNil(object)
                    XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object?.testString, "string1")
@@ -984,7 +1033,7 @@ final class TransactionTests: BaseTestCase {
            }
            do {
                
-                guard let object = transaction.fetchOne(From<TestEntity1>("Config1")) else {
+                guard let object = try transaction.fetchOne(From<TestEntity1>("Config1")) else {
                    
                    XCTFail()
                    return
@@ -998,10 +1047,10 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                    
-                    let object = stack.fetchOne(From<TestEntity1>("Config1"))
+                    let object = try stack.fetchOne(From<TestEntity1>("Config1"))
                    XCTAssertNotNil(object)
                    XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object?.testString, "string1_edit")
@@ -1015,7 +1064,7 @@ final class TransactionTests: BaseTestCase {
            }
            do {
                
-                let object = transaction.fetchOne(From<TestEntity1>("Config1"))
+                let object = try transaction.fetchOne(From<TestEntity1>("Config1"))
                transaction.delete(object)
                
                do {
@@ -1023,8 +1072,8 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 0)
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 0)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                }
                catch {
                    
@@ -1050,11 +1099,11 @@ final class TransactionTests: BaseTestCase {
                
                transaction.rollback()
                
-                XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 0)
-                XCTAssertNil(transaction.fetchOne(From<TestEntity1>()))
+                XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 0)
+                XCTAssertNil(try transaction.fetchOne(From<TestEntity1>()))
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
-                XCTAssertNil(stack.fetchOne(From<TestEntity1>()))
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
+                XCTAssertNil(try stack.fetchOne(From<TestEntity1>()))
            }
            
            let testDate = Date()
@@ -1079,7 +1128,7 @@ final class TransactionTests: BaseTestCase {
            
            do {
                
-                guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                    
                    XCTFail()
                    return
@@ -1090,8 +1139,8 @@ final class TransactionTests: BaseTestCase {
                
                transaction.rollback()
                
-                XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
-                if let object = transaction.fetchOne(From<TestEntity1>()) {
+                XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
+                if let object = try transaction.fetchOne(From<TestEntity1>()) {
                    
                    XCTAssertEqual(object.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object.testString, "string1")
@@ -1103,8 +1152,8 @@ final class TransactionTests: BaseTestCase {
                    XCTFail()
                }
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                if let object = stack.fetchOne(From<TestEntity1>()) {
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+                if let object = try stack.fetchOne(From<TestEntity1>()) {
                    
                    XCTAssertEqual(object.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object.testString, "string1")
@@ -1119,7 +1168,7 @@ final class TransactionTests: BaseTestCase {
            
            do {
                
-                guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                    
                    XCTFail()
                    return
@@ -1128,8 +1177,8 @@ final class TransactionTests: BaseTestCase {
                
                transaction.rollback()
                
-                XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
-                if let object = transaction.fetchOne(From<TestEntity1>()) {
+                XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
+                if let object = try transaction.fetchOne(From<TestEntity1>()) {
                    
                    XCTAssertEqual(object.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object.testString, "string1")
@@ -1141,8 +1190,8 @@ final class TransactionTests: BaseTestCase {
                    XCTFail()
                }
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                if let object = stack.fetchOne(From<TestEntity1>()) {
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+                if let object = try stack.fetchOne(From<TestEntity1>()) {
                    
                    XCTAssertEqual(object.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object.testString, "string1")
--- a/CoreStoreTests/TweakTests.swift
+++ b/CoreStoreTests/TweakTests.swift
@@ -2,7 +2,7 @@
 //  TweakTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -43,7 +43,7 @@ final class TweakTests: XCTestCase {
            $0.fetchLimit = 200
            $0.predicate = predicate
        }
-        let request = CoreStoreFetchRequest()
+        let request = CoreStoreFetchRequest<NSFetchRequestResult>()
        tweak.applyToFetchRequest(request)
        XCTAssertEqual(request.fetchOffset, 100)
        XCTAssertEqual(request.fetchLimit, 200)
--- a/CoreStoreTests/VersionLockTests.swift
+++ b/CoreStoreTests/VersionLockTests.swift
@@ -0,0 +1,55 @@
+//
+//  VersionLockTests.swift
+//  CoreStore
+//
+//  Copyright © 2018 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import XCTest
+
+@testable
+import CoreStore
+
+
+//MARK: - VersionLockTests
+
+final class VersionLockTests: XCTestCase {
+
+    @objc
+    dynamic func test_ThatVersionLocksProduceCorrectHashes() {
+        
+        let versionLock: VersionLock = [
+            "Animal": [0x1b59d511019695cf, 0xdeb97e86c5eff179, 0x1cfd80745646cb3, 0x4ff99416175b5b9a],
+            "Dog": [0xe3f0afeb109b283a, 0x29998d292938eb61, 0x6aab788333cfc2a3, 0x492ff1d295910ea7],
+            "Person": [0x2831cf046084d96d, 0xbe19b13ace54641, 0x635a082728b0f6f0, 0x3d4ef2dd4b74a87c]
+        ]
+        XCTAssertEqual(
+            versionLock.description,
+            """
+            [
+                "Animal": [0x1b59d511019695cf, 0xdeb97e86c5eff179, 0x1cfd80745646cb3, 0x4ff99416175b5b9a],
+                "Dog": [0xe3f0afeb109b283a, 0x29998d292938eb61, 0x6aab788333cfc2a3, 0x492ff1d295910ea7],
+                "Person": [0x2831cf046084d96d, 0xbe19b13ace54641, 0x635a082728b0f6f0, 0x3d4ef2dd4b74a87c]
+            ]
+            """
+        )
+    }
+}
--- a/CoreStoreTests/WhereTests.swift
+++ b/CoreStoreTests/WhereTests.swift
@@ -2,7 +2,7 @@
 //  WhereTests.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -56,6 +56,275 @@ final class WhereTests: XCTestCase {
    dynamic func test_ThatDynamicModelKeyPaths_CanBeCreated() {
        
        XCTAssertEqual(String(keyPath: \TestEntity1.testEntityID), "testEntityID")
+        XCTAssertEqual(String(keyPath: \Animal.color), "color")
+    }
+
+    @objc
+    dynamic func test_ThatExpressions_HaveCorrectKeyPaths() {
+
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    #keyPath(TestEntity1.testToOne.testEntityID),
+                    (\TestEntity1.testToOne ~ \.testEntityID).description,
+                    String(keyPath: \TestEntity1.testToOne ~ \.testEntityID)
+                )
+                XCTAssertEqual(
+                    #keyPath(TestEntity1.testToOne.testToOne.testToManyUnordered),
+                    (\TestEntity1.testToOne ~ \.testToOne ~ \.testToManyUnordered).description,
+                    String(keyPath: \TestEntity1.testToOne ~ \.testToOne ~ \.testToManyUnordered)
+                )
+                XCTAssertEqual(
+                    #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered),
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).description,
+                    String(keyPath: \TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered)
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "master.pets",
+                    (\Animal.master ~ \.pets).description,
+                    String(keyPath: \Animal.master ~ \.pets)
+                )
+                XCTAssertEqual(
+                    "master.pets.species",
+                    (\Animal.master ~ \.pets ~ \.species).description,
+                    String(keyPath: \Animal.master ~ \.pets ~ \.species)
+                )
+                XCTAssertEqual(
+                    "master.pets.master",
+                    (\Animal.master ~ \.pets ~ \.master).description,
+                    String(keyPath: \Animal.master ~ \.pets ~ \.master)
+                )
+            }
+        }
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    #keyPath(TestEntity1.testToOne.testToManyUnordered) + ".@count",
+                    (\TestEntity1.testToOne ~ \.testToManyUnordered).count().description,
+                    String(keyPath: (\TestEntity1.testToOne ~ \.testToManyUnordered).count())
+                )
+                XCTAssertEqual(
+                    #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered) + ".@count",
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).count().description,
+                    String(keyPath: (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).count())
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "master.pets.@count",
+                    (\Animal.master ~ \.pets).count().description,
+                    String(keyPath: (\Animal.master ~ \.pets).count())
+                )
+            }
+        }
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    "ANY " + #keyPath(TestEntity1.testToOne.testToManyUnordered),
+                    (\TestEntity1.testToOne ~ \.testToManyUnordered).any().description,
+                    String(keyPath: (\TestEntity1.testToOne ~ \.testToManyUnordered).any())
+                )
+                XCTAssertEqual(
+                    "ANY " + #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered),
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).any().description,
+                    String(keyPath: (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).any())
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "ANY master.pets",
+                    (\Animal.master ~ \.pets).any().description,
+                    String(keyPath: (\Animal.master ~ \.pets).any())
+                )
+                XCTAssertEqual(
+                    "ANY master.pets.species",
+                    (\Animal.master ~ \.pets ~ \.species).any().description,
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).any())
+                )
+            }
+        }
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    "ALL " + #keyPath(TestEntity1.testToOne.testToManyUnordered),
+                    (\TestEntity1.testToOne ~ \.testToManyUnordered).all().description,
+                    String(keyPath: (\TestEntity1.testToOne ~ \.testToManyUnordered).all())
+                )
+                XCTAssertEqual(
+                    "ALL " + #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered),
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).all().description,
+                    String(keyPath: (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).all())
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "ALL master.pets",
+                    (\Animal.master ~ \.pets).all().description,
+                    String(keyPath: (\Animal.master ~ \.pets).all())
+                )
+                XCTAssertEqual(
+                    "ALL master.pets.species",
+                    (\Animal.master ~ \.pets ~ \.species).all().description,
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).all())
+                )
+            }
+        }
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    "NONE " + #keyPath(TestEntity1.testToOne.testToManyUnordered),
+                    (\TestEntity1.testToOne ~ \.testToManyUnordered).none().description,
+                    String(keyPath: (\TestEntity1.testToOne ~ \.testToManyUnordered).none())
+                )
+                XCTAssertEqual(
+                    "NONE " + #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered),
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).none().description,
+                    String(keyPath: (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).none())
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "NONE master.pets",
+                    (\Animal.master ~ \.pets).none().description,
+                    String(keyPath: (\Animal.master ~ \.pets).none())
+                )
+                XCTAssertEqual(
+                    "NONE master.pets.species",
+                    (\Animal.master ~ \.pets ~ \.species).none().description,
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).none())
+                )
+            }
+        }
+    }
+
+    @objc
+    dynamic func test_ThatWhereClauses_CanBeCreatedFromExpressionsCorrectly() {
+
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testString) == dummy
+                let predicate = NSPredicate(format: "\(#keyPath(TestEntity1.testToOne.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.name) == dummy
+                let predicate = NSPredicate(format: "master.name == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToOne ~ \.testString) == dummy
+                let predicate = NSPredicate(format: "\(#keyPath(TestEntity1.testToOne.testToOne.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.spouse ~ \.name) == dummy
+                let predicate = NSPredicate(format: "master.spouse.name == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let count = 3
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToManyUnordered).count() == count
+                let predicate = NSPredicate(format: "\(#keyPath(TestEntity1.testToOne.testToManyUnordered)).@count == %d", count)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.pets).count() == count
+                let predicate = NSPredicate(format: "master.pets.@count == %d", count)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToManyUnordered ~ \TestEntity1.testString).any() == dummy
+                let predicate = NSPredicate(format: "ANY \(#keyPath(TestEntity1.testToOne.testToManyUnordered)).\(#keyPath(TestEntity1.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).any() == dummy
+                let predicate = NSPredicate(format: "ANY master.pets.species == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToManyUnordered ~ \TestEntity1.testString).all() == dummy
+                let predicate = NSPredicate(format: "ALL \(#keyPath(TestEntity1.testToOne.testToManyUnordered)).\(#keyPath(TestEntity1.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).all() == dummy
+                let predicate = NSPredicate(format: "ALL master.pets.species == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToManyUnordered ~ \TestEntity1.testString).none() == dummy
+                let predicate = NSPredicate(format: "NONE \(#keyPath(TestEntity1.testToOne.testToManyUnordered)).\(#keyPath(TestEntity1.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).none() == dummy
+                let predicate = NSPredicate(format: "NONE master.pets.species == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
    }
    
    @objc
@@ -314,7 +583,7 @@ final class WhereTests: XCTestCase {
    dynamic func test_ThatWhereClauses_ApplyToFetchRequestsCorrectly() {
        
        let whereClause = Where<NSManagedObject>("key", isEqualTo: "value")
-        let request = CoreStoreFetchRequest()
+        let request = CoreStoreFetchRequest<NSFetchRequestResult>()
        whereClause.applyToFetchRequest(request)
        XCTAssertNotNil(request.predicate)
        XCTAssertEqual(request.predicate, whereClause.predicate)
--- a/2
+++ b/2
@@ -1,6 +1,6 @@
 The MIT License (MIT)

-Copyright © 2014 John Rommel Estropia
+Copyright © 2018 John Rommel Estropia

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
--- a/Package.swift
+++ b/Package.swift
@@ -1,8 +1,9 @@
+// swift-tools-version:4.2
 //
 //  Package.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -25,21 +26,18 @@

 import PackageDescription

-let targets: [Target]
-#if os(iOS)
-targets = [Target(name: "CoreStore iOS")]
-#elseif os(OSX)
-targets = [Target(name: "CoreStore OSX")]
-#elseif os(watchOS)
-targets = [Target(name: "CoreStore watchOS")]
-#elseif os(tvOS)
-targets = [Target(name: "CoreStore tvOS")]
-#else
-targets = []
-#endif
-
 let package = Package(
    name: "CoreStore",
-    targets: targets,
-    exclude: ["Carthage", "CoreStoreDemo", "Sources/libA/images"]
+    products: [
+        .library(name: "CoreStore", type: .static, targets: ["CoreStore"])
+    ],
+    dependencies: [],
+    targets: [
+        .target(
+            name: "CoreStore",
+            dependencies: [],
+            path: "Sources",
+            exclude: ["CoreStoreBridge.h", "CoreStoreBridge.m"]
+        )
+    ]
 )
--- a/Playground_iOS.playground/Contents.swift
+++ b/Playground_iOS.playground/Contents.swift
@@ -0,0 +1,79 @@
+import UIKit
+import CoreStore
+import PlaygroundSupport
+
+PlaygroundPage.current.needsIndefiniteExecution = true
+
+/// Model Declaration =====
+class Animal: CoreStoreObject {
+    let species = Value.Required<String>("species", initial: "Swift")
+    let master = Relationship.ToOne<Person>("master")
+    let color = Transformable.Optional<UIColor>("color", initial: .orange)
+}
+
+class Person: CoreStoreObject {
+    let name = Value.Optional<String>("name")
+    let pets = Relationship.ToManyUnordered<Animal>("pets", inverse: { $0.master })
+}
+/// =======================
+
+/// Stack setup ===========
+let dataStack = DataStack(
+    CoreStoreSchema(
+        modelVersion: "V1",
+        entities: [
+            Entity<Animal>("Animal"),
+            Entity<Person>("Person")
+        ]
+    )
+)
+dataStack.addStorage(
+    SQLiteStore(fileName: "data.sqlite"),
+    completion: { result in
+
+        switch result {
+
+        case .failure(let error):
+            print(error)
+
+        case .success:
+            /// Transactions ==========
+            dataStack.perform(
+                asynchronous: { transaction in
+
+                    let animal = transaction.create(Into<Animal>())
+                    animal.species .= "Sparrow"
+                    animal.color .= .yellow
+
+                    let person = transaction.create(Into<Person>())
+                    person.name .= "John"
+                    person.pets.value.insert(animal)
+                },
+                completion: { result in
+
+                    switch result {
+
+                    case .failure(let error):
+                        print(error)
+
+                    case .success:
+                        /// Accessing Objects =====
+                        let bird = try! dataStack.fetchOne(From<Animal>().where(\.species == "Sparrow"))!
+                        print(bird.species.value)
+                        print(bird.color.value as Any)
+                        print(bird)
+
+                        let owner = bird.master.value!
+                        print(owner.name.value as Any)
+                        print(owner.pets.count)
+                        print(owner)
+                        /// =======================
+                    }
+                }
+            )
+            /// =======================
+        }
+    }
+)
+
+
--- a/Playground_iOS.playground/contents.xcplayground
+++ b/Playground_iOS.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
--- a/Playground_iOS.playground/playground.xcworkspace/contents.xcworkspacedata
+++ b/Playground_iOS.playground/playground.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+</Workspace>
--- a/Playground_macOS.playground/Contents.swift
+++ b/Playground_macOS.playground/Contents.swift
@@ -0,0 +1,77 @@
+import AppKit
+import CoreStore
+import PlaygroundSupport
+
+PlaygroundPage.current.needsIndefiniteExecution = true
+
+/// Model Declaration =====
+class Animal: CoreStoreObject {
+    let species = Value.Required<String>("species", initial: "Swift")
+    let master = Relationship.ToOne<Person>("master")
+    let color = Transformable.Optional<NSColor>("color", initial: .orange)
+}
+
+class Person: CoreStoreObject {
+    let name = Value.Optional<String>("name")
+    let pets = Relationship.ToManyUnordered<Animal>("pets", inverse: { $0.master })
+}
+/// =======================
+
+/// Stack setup ===========
+let dataStack = DataStack(
+    CoreStoreSchema(
+        modelVersion: "V1",
+        entities: [
+            Entity<Animal>("Animal"),
+            Entity<Person>("Person")
+        ]
+    )
+)
+dataStack.addStorage(
+    SQLiteStore(fileName: "data.sqlite"),
+    completion: { result in
+
+        switch result {
+
+        case .failure(let error):
+            print(error)
+
+        case .success:
+            /// Transactions ==========
+            dataStack.perform(
+                asynchronous: { transaction in
+
+                    let animal = transaction.create(Into<Animal>())
+                    animal.species .= "Sparrow"
+                    animal.color .= .yellow
+
+                    let person = transaction.create(Into<Person>())
+                    person.name .= "John"
+                    person.pets.value.insert(animal)
+                },
+                completion: { result in
+
+                    switch result {
+
+                    case .failure(let error):
+                        print(error)
+
+                    case .success:
+                        /// Accessing Objects =====
+                        let bird = try! dataStack.fetchOne(From<Animal>().where(\.species == "Sparrow"))!
+                        print(bird.species.value)
+                        print(bird.color.value as Any)
+                        print(bird)
+
+                        let owner = bird.master.value!
+                        print(owner.name.value as Any)
+                        print(owner.pets.count)
+                        print(owner)
+                        /// =======================
+                    }
+                }
+            )
+            /// =======================
+        }
+    }
+)
--- a/Playground_macOS.playground/contents.xcplayground
+++ b/Playground_macOS.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='macos' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
--- a/Playground_macOS.playground/playground.xcworkspace/contents.xcworkspacedata
+++ b/Playground_macOS.playground/playground.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
--- a/Playground_macOS.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/Playground_macOS.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
--- a/README.md
+++ b/README.md
@@ -6,22 +6,23 @@ Unleashing the real power of Core Data with the elegance and safety of Swift
 <br />
 <br />
 <a href="https://travis-ci.org/JohnEstropia/CoreStore"><img alt="Build Status" src="https://img.shields.io/travis/JohnEstropia/CoreStore/master.svg?style=flat" /></a>
+<a href="https://github.com/JohnEstropia/CoreStore/commits"><img alt="Last Commit" src="https://img.shields.io/github/last-commit/johnestropia/corestore.svg?style=flat" /></a>
 <a href="http://cocoadocs.org/docsets/CoreStore"><img alt="Platform" src="https://img.shields.io/cocoapods/p/CoreStore.svg?style=flat" /></a>
 <a href="https://raw.githubusercontent.com/JohnEstropia/CoreStore/master/LICENSE"><img alt="License" src="https://img.shields.io/cocoapods/l/CoreStore.svg?style=flat" /></a>
 <br /><br />Dependency managers<br />
 <a href="https://cocoapods.org/pods/CoreStore"><img alt="Cocoapods compatible" src="https://img.shields.io/cocoapods/v/CoreStore.svg?style=flat&label=Cocoapods" /></a>
 <a href="https://github.com/Carthage/Carthage"><img alt="Carthage compatible" src="https://img.shields.io/badge/Carthage-compatible-16a085.svg?style=flat" /></a>
-<a href="https://swiftpkgs.ng.bluemix.net/package/JohnEstropia/CoreStore"><img alt="Swift Package Manager compatible" src="https://img.shields.io/badge/Swift_Package_Manager-compatible-orange.svg?style=flat" /></a>
+<a href="https://swift.org/source-compatibility/#current-list-of-projects"><img alt="Swift Package Manager compatible" src="https://img.shields.io/badge/Swift_Package_Manager-compatible-orange.svg?style=flat" /></a>
 <br /><br />Contact<br />
 <a href="http://swift-corestore-slack.herokuapp.com/"><img alt="Join us on Slack!" src="http://swift-corestore-slack.herokuapp.com/badge.svg" /></a>
 <a href="https://twitter.com/JohnEstropia"><img alt="Reach me on Twitter!" src="https://img.shields.io/badge/twitter-%40JohnEstropia-3498db.svg" /></a>
 <br />
 </p>

-* **Swift 4.0:** iOS 8+ / macOS 10.10+ / watchOS 2.0+ / tvOS 9.0+
-* Other Swift versions: [Swift 3.2(version 4.2.3)](https://github.com/JohnEstropia/CoreStore/tree/4.2.3)
+* **Swift 5.0:** iOS 10+ / macOS 10.12+ / watchOS 3.0+ / tvOS 10.0+
+* Previously supported Swift versions: [Swift 3.2](https://github.com/JohnEstropia/CoreStore/tree/4.2.3), [Swift 4.2](https://github.com/JohnEstropia/CoreStore/tree/6.2.1)

-Upgrading from CoreStore 4.2 (Swift 3.2) to 5.0 (Swift 4.0)? Check out the [new features](#features) and make sure to read the [Change logs](https://github.com/JohnEstropia/CoreStore/releases).
+Upgrading from CoreStore 5.x (min iOS 9) to 6.x (min iOS 10)? Check out the [new features](#features) and make sure to read the [Change logs](https://github.com/JohnEstropia/CoreStore/releases).

 CoreStore is now part of the [Swift Source Compatibility projects](https://swift.org/source-compatibility/#current-list-of-projects).

@@ -58,13 +59,12 @@ CoreStore was (and is) heavily shaped by real-world needs of developing data-dep
    - [Setting up](#setting-up)
        - [In-memory store](#in-memory-store)
        - [Local store](#local-store)
-        - [iCloud store](#icloud-store)
    - [Migrations](#migrations)
        - [Declaring model versions](#declaring-model-versions)
        - [Starting migrations](#starting-migrations)
        - [Progressive migrations](#progressive-migrations)
        - [Forecasting migrations](#forecasting-migrations)
-        - [Custom migratoins](#custom-migrations)
+        - [Custom migrations](#custom-migrations)
    - [Saving and processing transactions](#saving-and-processing-transactions)
        - [Transaction types](#transaction-types)
            - [Asynchronous transactions](#asynchronous-transactions)
@@ -86,6 +86,7 @@ CoreStore was (and is) heavily shaped by real-world needs of developing data-dep
            - [`GroupBy` clause](#groupby-clause)
    - [Logging and error reporting](#logging-and-error-reporting)
    - [Observing changes and notifications](#observing-changes-and-notifications)
+        - [Observe a single property](#observe-a-single-property)
        - [Observe a single object](#observe-a-single-object)
        - [Observe a list of objects](#observe-a-list-of-objects)
    - [Objective-C support](#objective-c-support)
@@ -139,12 +140,12 @@ CoreStore.perform(

 Fetching objects (simple):
 ```swift
-let people = CoreStore.fetchAll(From<MyPersonEntity>())
+let people = try CoreStore.fetchAll(From<MyPersonEntity>())
 ```

 Fetching objects (complex):
 ```swift
-let people = CoreStore.fetchAll(
+let people = try CoreStore.fetchAll(
    From<MyPersonEntity>()
        .where(\.age > 30),
        .orderBy(.ascending(\.name), .descending(.\age)),
@@ -154,7 +155,7 @@ let people = CoreStore.fetchAll(

 Querying values:
 ```swift
-let maxAge = CoreStore.queryValue(
+let maxAge = try CoreStore.queryValue(
    From<MyPersonEntity>()
        .select(Int.self, .maximum(\.age))
 )
@@ -215,9 +216,9 @@ let migrationProgress = dataStack.addStorage(
    completion: { (result) -> Void in
        switch result {
        case .success(let storage):
-            print("Successfully added sqlite store: \(storage)"
+            print("Successfully added sqlite store: \(storage)")
        case .failure(let error):
-            print("Failed adding sqlite store with error: \(error)"
+            print("Failed adding sqlite store with error: \(error)")
        }
    }
 )
@@ -311,66 +312,6 @@ public protocol LocalStorage: StorageInterface {
 ```
 If you have custom `NSIncrementalStore` or `NSAtomicStore` subclasses, you can implement this protocol and use it similarly to `SQLiteStore`.

-### iCloud Store
-> ⚠️**Important:** The iCloud Store is being deprecated. Please use with caution. If you have any concerns please do send me a message on [Twitter](https://twitter.com/JohnEstropia) or on the [CoreStore Slack Team](http://swift-corestore-slack.herokuapp.com/)
-
-As a counterpart to `LocalStorage`, the `CloudStorage` protocol abstracts stores managed in the cloud. CoreStore currently provides the concrete class `ICloudStore`. Unlike `InMemoryStore` and `SQLiteStore` though, the `ICloudStore`'s initializer may return `nil` if the iCloud container could not be located or if iCloud is not available on the device:
-```swift
-guard let storage = ICloudStore(
-    ubiquitousContentName: "MyAppCloudData", // the name of the store in iCloud
-    ubiquitousContentTransactionLogsSubdirectory: "logs/config1", // optional. Subdirectory path for the transaction logs
-    ubiquitousContainerID: "iCloud.com.mycompany.myapp.containername", // optional. The container if your app has multiple ubiquity container identifiers in its entitlements
-    ubiquitousPeerToken: "9614d658014f4151a95d8048fb717cf0", // optional. A per-application salt to allow multiple apps on the same device to share a Core Data store integrated with iCloud
-    configuration: "Config1", // optional. Use entities from the "Config1" configuration in the .xcdatamodeld file
-    cloudStorageOptions: .recreateLocalStoreOnModelMismatch // optional. Provides settings that tells the DataStack how to setup the persistent store
-) else {
-    // The iCloud container could not be located or if iCloud is not available on the device.
-    // Handle appropriately
-    return    
-}
-CoreStore.addStorage(,
-    storage,
-    completion: { result in
-        switch result {
-        case .success(let storage): // ...
-        case .failure(let error): // ...
-        }
-    }
-)
-```
-
-If your app is using iCloud stores, you may want to be notified of particular iCloud events. The `ICloudStoreObserver` functions are all optional, so you may implement only the ones your app is interested in:
-```swift
-public protocol ICloudStoreObserver: class {
-    func iCloudStoreWillFinishUbiquitousStoreInitialImport(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreDidFinishUbiquitousStoreInitialImport(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreWillAddAccount(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreDidAddAccount(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreWillRemoveAccount(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreDidRemoveAccount(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreWillRemoveContent(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreDidRemoveContent(storage storage: ICloudStore, dataStack: DataStack)
-}
-```
-To register your `ICloudStoreObserver`, call `addObserver(_:)` on the `ICloudStore` instance:
-
-```swift
-guard let storage = ICloudStore(/* ... */) else {
-    return    
-}
-storage.addObserver(self) // assuming self implements ICloudStoreObserver
-CoreStore.addStorage(,
-    storage,
-    completion: { result in
-        switch result {
-        case .success(let storage): // ... You may also call storage.addObserver(_:) here
-        case .failure(let error): // ...
-        }
-    }
-)
-```
-The `ICloudStore` only keeps weak references of the registered observers. You may call `removeObserver(_:)` for precise deregistration, but `ICloudStore` automatically removes deallocated observers.
-

 ## Migrations

@@ -825,13 +766,13 @@ While the syntax is straightforward, CoreStore does not just naively insert a ne
 - If the entity belongs to multiple stores, an assertion failure will be raised. **This is also a programmer error and should never occur in production code.** Normally, with Core Data you can insert an object in this state but saving the `NSManagedObjectContext` will always fail. CoreStore checks this for you at creation time when it makes sense (not during save).

 If the entity exists in multiple configurations, you need to provide the configuration name for the destination persistent store:
-
-    let person = transaction.create(Into<MyPersonEntity>("Config1"))
-
+```swift
+let person = transaction.create(Into<MyPersonEntity>("Config1"))
+```
 or if the persistent store is the auto-generated "Default" configuration, specify `nil`:
-
-    let person = transaction.create(Into<MyPersonEntity>(nil))
-
+```swift
+let person = transaction.create(Into<MyPersonEntity>(nil))
+```
 Note that if you do explicitly specify the configuration name, CoreStore will only try to insert the created object to that particular store and will fail if that store is not found; it will not fall back to any other configuration that the entity belongs to. 

 ### Updating objects
@@ -851,7 +792,7 @@ To update an existing object, fetch the object's instance from the transaction:
 ```swift
 CoreStore.perform(
    asynchronous: { (transaction) -> Void in
-        let person = transaction.fetchOne(
+        let person = try transaction.fetchOne(
            From<MyPersonEntity>()
                .where(\.name == "Jane Smith")
        )
@@ -913,8 +854,8 @@ let jane: MyPersonEntity = // ...

 CoreStore.perform(
    asynchronous: { (transaction) -> Void in
-        transaction.delete(john, jane)
-        // transaction.delete([john, jane]) is also allowed
+        try transaction.delete(john, jane)
+        // try transaction.delete([john, jane]) is also allowed
    },
    completion: { _ in }
 )
@@ -923,7 +864,7 @@ If you do not have references yet to the objects to be deleted, transactions hav
 ```swift
 CoreStore.perform(
    asynchronous: { (transaction) -> Void in
-        transaction.deleteAll(
+        try transaction.deleteAll(
            From<MyPersonEntity>()
                .where(\.age > 30)
        )
@@ -971,7 +912,7 @@ var peopleIDs: [NSManagedObjectID] = // ...

 CoreStore.perform(
    asynchronous: { (transaction) -> Void in
-        let jane = transaction.fetchOne(
+        let jane = try transaction.fetchOne(
            From<MyPersonEntity>()
                .where(\.name == "Jane Smith")
        )
@@ -1023,7 +964,7 @@ You can even use external types from popular 3rd-party JSON libraries, or just s
 #### `ImportableObject`
 `ImportableObject` is a very simple protocol:
 ```swift
-public protocol ImportableObject: class {
+public protocol ImportableObject: AnyObject {
    typealias ImportSource
    static func shouldInsert(from source: ImportSource, in transaction: BaseDataTransaction) -> Bool
    func didInsert(from source: ImportSource, in transaction: BaseDataTransaction) throws
@@ -1184,17 +1125,17 @@ Before we dive in, be aware that CoreStore distinguishes between *fetching* and
 #### `From` clause
 The search conditions for fetches and queries are specified using *clauses*. All fetches and queries require a `From` clause that indicates the target entity type:
 ```swift
-let people = CoreStore.fetchAll(From<MyPersonEntity>())
+let people = try CoreStore.fetchAll(From<MyPersonEntity>())
 ```
 `people` in the example above will be of type `[MyPersonEntity]`. The `From<MyPersonEntity>()` clause indicates a fetch to all persistent stores that `MyPersonEntity` belong to.

 If the entity exists in multiple configurations and you need to only search from a particular configuration, indicate in the `From` clause the configuration name for the destination persistent store:
 ```swift
-let people = CoreStore.fetchAll(From<MyPersonEntity>("Config1")) // ignore objects in persistent stores other than the "Config1" configuration
+let people = try CoreStore.fetchAll(From<MyPersonEntity>("Config1")) // ignore objects in persistent stores other than the "Config1" configuration
 ```
 or if the persistent store is the auto-generated "Default" configuration, specify `nil`:
 ```swift
-let person = CoreStore.fetchAll(From<MyPersonEntity>(nil))
+let person = try CoreStore.fetchAll(From<MyPersonEntity>(nil))
 ```
 Now we know how to use a `From` clause, let's move on to fetching and querying.

@@ -1214,11 +1155,11 @@ Each method's purpose is straightforward, but we need to understand how to set t

 The `Where` clause is CoreStore's `NSPredicate` wrapper. It specifies the search filter to use when fetching (or querying). It implements all initializers that `NSPredicate` does (except for `-predicateWithBlock:`, which Core Data does not support):
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    Where<MyPersonEntity>("%K > %d", "age", 30) // string format initializer
 )
-people = CoreStore.fetchAll(
+people = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    Where<MyPersonEntity>(true) // boolean initializer
 )
@@ -1233,14 +1174,14 @@ var people = CoreStore.fetchAll(
 ```
 ⭐️Starting CoreStore 5.0, `Where` clauses became more type-safe and are now generic types. To avoid verbose repetition of the generic object type, fetch methods now support **Fetch Chain builders**. We can also use Swift's Smart KeyPaths as the `Where` clause expression:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>()
        .where(\.age > 30) // Type-safe!
 )
 ```
 `Where` clauses also implement the `&&`, `||`, and `!` logic operators, so you can provide logical conditions without writing too much `AND`, `OR`, and `NOT` strings:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>()
        .where(\.age > 30 && \.gender == "M")
 )
@@ -1251,7 +1192,7 @@ If you do not provide a `Where` clause, all objects that belong to the specified

 The `OrderBy` clause is CoreStore's `NSSortDescriptor` wrapper. Use it to specify attribute keys in which to sort the fetch (or query) results with.
 ```swift
-var mostValuablePeople = CoreStore.fetchAll(
+var mostValuablePeople = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    OrderBy<MyPersonEntity>(.descending("rating"), .ascending("surname"))
 )
@@ -1259,7 +1200,7 @@ var mostValuablePeople = CoreStore.fetchAll(
 As seen above, `OrderBy` accepts a list of `SortKey` enumeration values, which can be either `.ascending` or `.descending`.
 ⭐️As with `Where` clauses, CoreStore 5.0 turned `OrderBy` clauses into generic types. To avoid verbose repetition of the generic object type, fetch methods now support **Fetch Chain builders**. We can also use Swift's Smart KeyPaths as the `OrderBy` clause expression:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>()
        .orderBy(.descending(\.rating), .ascending(\.surname)) // Type-safe!
 )
@@ -1271,7 +1212,7 @@ var orderBy = OrderBy<MyPersonEntity>(.descending(\.rating))
 if sortFromYoungest {
    orderBy += OrderBy(.ascending(\.age))
 }
-var mostValuablePeople = CoreStore.fetchAll(
+var mostValuablePeople = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    orderBy
 )
@@ -1281,7 +1222,7 @@ var mostValuablePeople = CoreStore.fetchAll(

 The `Tweak` clause lets you, uh, *tweak* the fetch (or query). `Tweak` exposes the `NSFetchRequest` in a closure where you can make changes to its properties:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    Where<MyPersonEntity>("age > %d", 30),
    OrderBy<MyPersonEntity>(.ascending("surname")),
@@ -1294,7 +1235,7 @@ var people = CoreStore.fetchAll(
 ```
 `Tweak` also supports **Fetch Chain builders**:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
        .where(\.age > 30)
        .orderBy(.ascending(\.surname))
@@ -1325,7 +1266,7 @@ Setting up the `From`, `Where`, `OrderBy`, and `Tweak` clauses is similar to how

 The `Select<T>` clause specifies the target attribute/aggregate key, as well as the expected return type: 
 ```swift
-let johnsAge = CoreStore.queryValue(
+let johnsAge = try CoreStore.queryValue(
    From<MyPersonEntity>(),
    Select<Int>("age"),
    Where("name == %@", "John Smith")
@@ -1335,14 +1276,14 @@ The example above queries the "age" property for the first object that matches t

 For `queryAttributes(...)`, only `NSDictionary` is valid for `Select`, thus you are allowed to omit the generic type:
 ```swift
-let allAges = CoreStore.queryAttributes(
+let allAges = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("age")
 )
 ```
 ⭐️Starting CoreStore 5.0, query methods now support **Query Chain builders**. We can also use Swift's Smart KeyPaths to use in the expressions:
 ```swift
-let johnsAge = CoreStore.queryValue(
+let johnsAge = try CoreStore.queryValue(
    From<MyPersonEntity>()
        .select(\.age) // binds the result to Int
        .where(\.name == "John Smith")
@@ -1357,7 +1298,7 @@ If you only need a value for a particular attribute, you can just specify the ke
 - `.sum(...)`

 ```swift
-let oldestAge = CoreStore.queryValue(
+let oldestAge = try CoreStore.queryValue(
    From<MyPersonEntity>(),
    Select<Int>(.maximum("age"))
 )
@@ -1365,7 +1306,7 @@ let oldestAge = CoreStore.queryValue(

 For `queryAttributes(...)` which returns an array of dictionaries, you can specify multiple attributes/aggregates to `Select`:
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("name", "age")
 )
@@ -1385,7 +1326,7 @@ let personJSON = CoreStore.queryAttributes(
 ```
 You can also include an aggregate as well:
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("name", .count("friends"))
 )
@@ -1405,7 +1346,7 @@ which returns:
 ```
 The `"count(friends)"` key name was automatically used by CoreStore, but you can specify your own key alias if you need:
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("name", .count("friends", as: "friendsCount"))
 )
@@ -1428,7 +1369,7 @@ which now returns:

 The `GroupBy` clause lets you group results by a specified attribute/aggregate. This is useful only for `queryAttributes(...)` since `queryValue(...)` just returns the first value.
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("age", .count("age", as: "count")),
    GroupBy("age")
@@ -1436,7 +1377,7 @@ let personJSON = CoreStore.queryAttributes(
 ```
 ⭐️Starting CoreStore 5.0, `GroupBy` clauses are now also generic types and now support **Query Chain builders**. We can also use Swift's Smart KeyPaths to use in the expressions:
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>()
        .select(.attribute(\.age), .count(\.age, as: "count"))
        .groupBy(\.age)
@@ -1491,16 +1432,35 @@ A couple of examples, `ListMonitor`:
 These are all implemented with `CustomDebugStringConvertible.debugDescription`, so they work with lldb's `po` command as well.

 ## Observing changes and notifications
-> (unavailable on macOS versions below 10.12)

 CoreStore provides type-safe wrappers for observing managed objects:

 - `ObjectMonitor`: use to monitor changes to a single `NSManagedObject` or `CoreStoreObject` instance (instead of Key-Value Observing)
 - `ListMonitor`: use to monitor changes to a list of `NSManagedObject` or `CoreStoreObject` instances (instead of `NSFetchedResultsController`)

+### Observe a single property
+To get notifications for single property changes in an object, there are two methods depending on the object's base class.
+
+- For `NSManagedObject` subclasses: Use the standard KVO method:
+```swift
+let observer = person.observe(\.age, options: [.new]) { (person, change)
+    print("Happy \(change.newValue)th birthday!")
+}
+```
+
+- For `CoreStoreObject` subclasses: Call the `observe(...)` method directly on the property. You'll notice that the API itself is a bit similar to the KVO method:
+```swift
+let observer = person.age.observe(options: [.new]) { (person, change)
+    print("Happy \(change.newValue)th birthday!")
+}
+```
+
+For both methods, you will need to keep a reference to the returned `observer` for the duration of the observation.  
+
+
 ### Observe a single object

-To observe an object, implement the `ObjectObserver` protocol and specify the `EntityType`:
+To observe an object itself as a whole, implement the `ObjectObserver` protocol and specify the `EntityType`:
 ```swift
 class MyViewController: UIViewController, ObjectObserver {
    func objectMonitor(monitor: ObjectMonitor<MyPersonEntity>, willUpdateObject object: MyPersonEntity) {
@@ -1654,14 +1614,13 @@ CoreStore.perform(
 <td><pre lang=objc>
 [CSCoreStore beginAsynchronous:^(CSAsynchronousDataTransaction *transaction) {
    // ...
-    [transaction commitWithCompletion:^(CSSaveResult *result) {
-        if (result.isSuccess) {
-            NSLog(@"Done");
-        }
-        else if (result.isFailure) {
-            NSLog(@"error: %@", result.error);
-        }
-    }];
+    [transaction 
+     commitWithSuccess:^{
+        NSLog(@"Done");
+     }
+     failure: ^(CSError *error) {
+        NSLog(@"error: %@", result.error);
+     }];
 }];
 </pre></td>
 </tr>
@@ -1796,7 +1755,7 @@ let keyPath: String = Dog.keyPath { $0.nickname }
 ```
 as well as `Where` and `OrderBy` clauses
 ```swift
-let puppies = CoreStore.fetchAll(
+let puppies = try CoreStore.fetchAll(
    From<Dog>()
        .where(\.age < 1)
        .orderBy(.ascending(\.age))
@@ -1841,8 +1800,9 @@ Once the version lock is set, any changes in the properties or to the model will

 # Installation
 - Requires:
-    - iOS 8 SDK and above
-    - Swift 4 (Xcode 9+)
+    - iOS 10 SDK and above
+    - Swift 5.0 (Xcode 10+)
+    - For previous Swift versions: [Swift 3.2](https://github.com/JohnEstropia/CoreStore/tree/4.2.3), [Swift 4.2](https://github.com/JohnEstropia/CoreStore/tree/6.2.1)
 - Dependencies:
    - *None*
 - Other notes:
@@ -1851,7 +1811,7 @@ Once the version lock is set, any changes in the properties or to the model will
 ### Install with CocoaPods
 In your `Podfile`, add
 ```
-pod 'CoreStore', '~> 5.0'
+pod 'CoreStore', '~> 6.3'
 ```
 and run 
 ```
@@ -1862,7 +1822,7 @@ This installs CoreStore as a framework. Declare `import CoreStore` in your swift
 ### Install with Carthage
 In your `Cartfile`, add
 ```
-github "JohnEstropia/CoreStore" >= 5.0.0
+github "JohnEstropia/CoreStore" >= 6.3.0
 ```
 and run 
 ```
@@ -1870,18 +1830,20 @@ carthage update
 ```
 This installs CoreStore as a framework. Declare `import CoreStore` in your swift file to use the library.

+#### Install with Swift Package Manager:
+```swift
+dependencies: [
+    .package(url: "https://github.com/JohnEstropia/CoreStore.git", from: "6.3.0"))
+]
+```
+Declare `import CoreStore` in your swift file to use the library.
+
 ### Install as Git Submodule
 ```
 git submodule add https://github.com/JohnEstropia/CoreStore.git <destination directory>
 ```
 Drag and drop **CoreStore.xcodeproj** to your project.

-#### To install as a framework:
-Drag and drop **CoreStore.xcodeproj** to your project.
-
-#### To include directly in your app module:
-Add all *.swift* files to your project.
-

 ### Objective-C support

--- a/Sources/AsynchronousDataTransaction.swift
+++ b/Sources/AsynchronousDataTransaction.swift
@@ -2,7 +2,7 @@
 //  AsynchronousDataTransaction.swift
 //  CoreStore
 //
-//  Copyright © 2015 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -50,45 +50,11 @@ public final class AsynchronousDataTransaction: BaseDataTransaction {
    // MARK: - Result
    
    /**
-     The `Result` contains the success or failure information for a completed transaction
+     The `Result` contains the success or failure information for a completed transaction.
+     `Result<T>.success` indicates that the transaction succeeded, either because the save succeeded or because there were no changes to save. The associated `userInfo` is the value returned from the transaction closure.
+     `Result<T>.failure` indicates that the transaction either failed or was cancelled. The associated object for this value is a `CoreStoreError` enum value.
     */
-    public enum Result<T> {
-        
-        /**
-         `Result<T>.success` indicates that the transaction succeeded, either because the save succeeded or because there were no changes to save. The associated `userInfo` is the value returned from the transaction closure.
-         */
-        case success(userInfo: T)
-        
-        /**
-         `Result<T>.failure` indicates that the transaction either failed or was cancelled. The associated object for this value is a `CoreStoreError` enum value.
-         */
-        case failure(error: CoreStoreError)
-        
-        /**
-         Returns `true` if the result indicates `.success`, `false` if the result is `.failure`.
-         */
-        public var boolValue: Bool {
-            
-            switch self {
-                
-            case .success: return true
-            case .failure: return false
-            }
-        }
-        
-        
-        // MARK: Internal
-        
-        internal init(userInfo: T) {
-            
-            self = .success(userInfo: userInfo)
-        }
-        
-        internal init(error: CoreStoreError) {
-            
-            self = .failure(error: error)
-        }
-    }
+    public typealias Result<UserInfoType> = Swift.Result<UserInfoType, CoreStoreError>
    
    // MARK: -
    
@@ -172,7 +138,7 @@ public final class AsynchronousDataTransaction: BaseDataTransaction {
            "Attempted to delete an entities from an already committed \(cs_typeName(self))."
        )
        
-        super.delete(([object1, object2] + objects).flatMap { $0 })
+        super.delete(([object1, object2] + objects).compactMap { $0 })
    }
    
    /**
@@ -212,67 +178,4 @@ public final class AsynchronousDataTransaction: BaseDataTransaction {
        group.wait()
        self.context.reset()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new auto-commiting methods `DataStack.perform(asynchronous:completion:)` or `DataStack.perform(asynchronous:success:failure:)`. Please read the documentation on the behavior of the new methods.")
-    public func commit(_ completion: @escaping (_ result: SaveResult) -> Void = { _ in }) {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to commit a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to commit a \(cs_typeName(self)) more than once."
-        )
-        self.autoCommit { (hasChanges, error) in
-            
-            if let error = error {
-                
-                completion(SaveResult(error))
-            }
-            else {
-                
-                completion(SaveResult(hasChanges: hasChanges))
-            }
-        }
-    }
-    
-    @available(*, deprecated, message: "Secondary tasks spawned from AsynchronousDataTransactions and SynchronousDataTransactions are no longer supported. ")
-    @discardableResult
-    public func beginSynchronous(_ closure: @escaping (_ transaction: SynchronousDataTransaction) -> Void) -> SaveResult? {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to begin a child transaction from a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to begin a child transaction from an already committed \(cs_typeName(self))."
-        )
-        let childTransaction = SynchronousDataTransaction(
-            mainContext: self.context,
-            queue: self.childTransactionQueue
-        )
-        childTransaction.transactionQueue.cs_sync {
-            
-            closure(childTransaction)
-            
-            if !childTransaction.isCommitted && childTransaction.hasChanges {
-                
-                CoreStore.log(
-                    .warning,
-                    message: "The closure for the \(cs_typeName(childTransaction)) completed without being committed. All changes made within the transaction were discarded."
-                )
-            }
-        }
-        switch childTransaction.result {
-            
-        case .none:                         return nil
-        case .some(let hasChanges, nil):    return SaveResult(hasChanges: hasChanges)
-        case .some(_, let error?):          return SaveResult(error)
-        }
-    }
 }
--- a/Sources/AttributeProtocol.swift
+++ b/Sources/AttributeProtocol.swift
@@ -2,7 +2,7 @@
 //  AttributeProtocol.swift
 //  CoreStore
 //
-//  Copyright © 2017 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -29,19 +29,19 @@ import CoreData

 // MARK: - AttributeProtocol

-internal protocol AttributeProtocol: class {
+internal protocol AttributeProtocol: AnyObject {
    
    static var attributeType: NSAttributeType { get }
    
    var keyPath: KeyPathString { get }
    var isOptional: Bool { get }
-    var isIndexed: Bool { get }
    var isTransient: Bool { get }
+    var allowsExternalBinaryDataStorage: Bool { get }
    var versionHashModifier: () -> String? { get }
    var renamingIdentifier: () -> String? { get }
    var defaultValue: () -> Any? { get }
    var affectedByKeyPaths: () -> Set<String> { get }
-    weak var parentObject: CoreStoreObject? { get set }
+    var rawObject: CoreStoreManagedObject? { get set }
    var getter: CoreStoreManagedObject.CustomGetter? { get }
    var setter: CoreStoreManagedObject.CustomSetter? { get }
 }
--- a/Sources/BaseDataTransaction+Importing.swift
+++ b/Sources/BaseDataTransaction+Importing.swift
@@ -2,7 +2,7 @@
 //  BaseDataTransaction+Importing.swift
 //  CoreStore
 //
-//  Copyright © 2015 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - BaseDataTransaction

-public extension BaseDataTransaction {
+extension BaseDataTransaction {
    
    /**
     Creates an `ImportableObject` by importing from the specified import source.
@@ -80,7 +80,7 @@ public extension BaseDataTransaction {
            
            try autoreleasepool {
              
-                let entityType = type(of: object)
+                let entityType = cs_dynamicType(of: object)
                guard entityType.shouldInsert(from: source, in: self) else {
                    
                    return
@@ -108,7 +108,7 @@ public extension BaseDataTransaction {
            
            return try autoreleasepool {
                
-                return try sourceArray.flatMap { (source) -> D? in
+                return try sourceArray.compactMap { (source) -> D? in
                  
                    let entityType = into.entityClass 
                    guard entityType.shouldInsert(from: source, in: self) else {
@@ -151,7 +151,7 @@ public extension BaseDataTransaction {
                    return nil
                }
                
-                if let object = self.fetchOne(From(entityType), Where<D>(uniqueIDKeyPath, isEqualTo: uniqueIDValue)) {
+                if let object = try self.fetchOne(From(entityType), Where<D>(uniqueIDKeyPath, isEqualTo: uniqueIDValue)) {
                    
                    guard entityType.shouldUpdate(from: source, in: self) else {
                        
@@ -201,7 +201,7 @@ public extension BaseDataTransaction {
                var importSourceByID = Dictionary<D.UniqueIDType, D.ImportSource>()
                let sortedIDs = try autoreleasepool {
                  
-                    return try sourceArray.flatMap { (source) -> D.UniqueIDType? in
+                    return try sourceArray.compactMap { (source) -> D.UniqueIDType? in
                        
                        guard let uniqueIDValue = try entityType.uniqueID(from: source, in: self) else {
                            
@@ -215,7 +215,8 @@ public extension BaseDataTransaction {
                importSourceByID = try autoreleasepool { try preProcess(importSourceByID) }

                var existingObjectsByID = Dictionary<D.UniqueIDType, D>()
-                self.fetchAll(From(entityType), Where<D>(entityType.uniqueIDKeyPath, isMemberOf: sortedIDs))?
+                try self
+                    .fetchAll(From(entityType), Where<D>(entityType.uniqueIDKeyPath, isMemberOf: sortedIDs))
                    .forEach { existingObjectsByID[$0.uniqueIDValue] = $0 }
              
                var processedObjectIDs = Set<D.UniqueIDType>()
--- a/Sources/BaseDataTransaction+Querying.swift
+++ b/Sources/BaseDataTransaction+Querying.swift
@@ -2,7 +2,7 @@
 //  BaseDataTransaction+Querying.swift
 //  CoreStore
 //
-//  Copyright © 2015 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -39,13 +39,13 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - returns: the number of `DynamicObject`s deleted
     */
    @discardableResult
-    public func deleteAll<D>(_ from: From<D>, _ deleteClauses: DeleteClause...) -> Int? {
+    public func deleteAll<D>(_ from: From<D>, _ deleteClauses: DeleteClause...) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to delete from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.deleteAll(from, deleteClauses)
+        return try self.context.deleteAll(from, deleteClauses)
    }
    
    /**
@@ -56,13 +56,13 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - returns: the number of `DynamicObject`s deleted
     */
    @discardableResult
-    public func deleteAll<D>(_ from: From<D>, _ deleteClauses: [DeleteClause]) -> Int? {
+    public func deleteAll<D>(_ from: From<D>, _ deleteClauses: [DeleteClause]) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to delete from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.deleteAll(from, deleteClauses)
+        return try self.context.deleteAll(from, deleteClauses)
    }
    
    /**
@@ -74,14 +74,14 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - returns: the number of `DynamicObject`s deleted
     */
    @discardableResult
-    public func deleteAll<B: FetchChainableBuilderType>(_ clauseChain: B) -> Int? {
+    public func deleteAll<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to delete from a \(cs_typeName(self)) outside its designated queue."
        )
        
-        return self.context.deleteAll(clauseChain.from, clauseChain.fetchClauses)
+        return try self.context.deleteAll(clauseChain.from, clauseChain.fetchClauses)
    }
    
    
@@ -136,15 +136,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchOne<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> D? {
+    public func fetchOne<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> D? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchOne(from, fetchClauses)
+        return try self.context.fetchOne(from, fetchClauses)
    }
    
    /**
@@ -152,15 +153,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchOne<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> D? {
+    public func fetchOne<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> D? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchOne(from, fetchClauses)
+        return try self.context.fetchOne(from, fetchClauses)
    }
    
    /**
@@ -173,15 +175,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchChainableBuilderType`
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchChainableBuilderType`, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchOne<B: FetchChainableBuilderType>(_ clauseChain: B) -> B.ObjectType? {
+    public func fetchOne<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> B.ObjectType? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchOne(clauseChain)
+        return try self.context.fetchOne(clauseChain)
    }
    
    /**
@@ -189,15 +192,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchAll<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> [D]? {
+    public func fetchAll<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> [D] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchAll(from, fetchClauses)
+        return try self.context.fetchAll(from, fetchClauses)
    }
    
    /**
@@ -205,15 +209,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchAll<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> [D]? {
+    public func fetchAll<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> [D] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchAll(from, fetchClauses)
+        return try self.context.fetchAll(from, fetchClauses)
    }
    
    /**
@@ -226,15 +231,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchChainableBuilderType`
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchChainableBuilderType`, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchAll<B: FetchChainableBuilderType>(_ clauseChain: B) -> [B.ObjectType]? {
+    public func fetchAll<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> [B.ObjectType] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchAll(clauseChain)
+        return try self.context.fetchAll(clauseChain)
    }
    
    /**
@@ -242,15 +248,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchClause`s
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchCount<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> Int? {
+    public func fetchCount<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchCount(from, fetchClauses)
+        return try self.context.fetchCount(from, fetchClauses)
    }
    
    /**
@@ -258,15 +265,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchClause`s
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchCount<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> Int? {
+    public func fetchCount<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchCount(from, fetchClauses)
+        return try self.context.fetchCount(from, fetchClauses)
    }
    
    /**
@@ -279,15 +287,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchCount<B: FetchChainableBuilderType>(_ clauseChain: B) -> Int? {
+    public func fetchCount<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchCount(clauseChain)
+        return try self.context.fetchCount(clauseChain)
    }
    
    /**
@@ -295,15 +304,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> NSManagedObjectID? {
+    public func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> NSManagedObjectID? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectID(from, fetchClauses)
+        return try self.context.fetchObjectID(from, fetchClauses)
    }
    
    /**
@@ -311,15 +321,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> NSManagedObjectID? {
+    public func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> NSManagedObjectID? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectID(from, fetchClauses)
+        return try self.context.fetchObjectID(from, fetchClauses)
    }
    
    /**
@@ -332,15 +343,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchChainableBuilderType`
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchChainableBuilderType`, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectID<B: FetchChainableBuilderType>(_ clauseChain: B) -> NSManagedObjectID? {
+    public func fetchObjectID<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> NSManagedObjectID? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectID(clauseChain)
+        return try self.context.fetchObjectID(clauseChain)
    }
    
    /**
@@ -348,15 +360,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> [NSManagedObjectID]? {
+    public func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> [NSManagedObjectID] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectIDs(from, fetchClauses)
+        return try self.context.fetchObjectIDs(from, fetchClauses)
    }
    
    /**
@@ -364,15 +377,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> [NSManagedObjectID]? {
+    public func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> [NSManagedObjectID] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectIDs(from, fetchClauses)
+        return try self.context.fetchObjectIDs(from, fetchClauses)
    }
    
    /**
@@ -385,15 +399,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectIDs<B: FetchChainableBuilderType>(_ clauseChain: B) -> [NSManagedObjectID]? {
+    public func fetchObjectIDs<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> [NSManagedObjectID] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectIDs(clauseChain)
+        return try self.context.fetchObjectIDs(clauseChain)
    }
    
    
@@ -407,15 +422,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - parameter from: a `From` clause indicating the entity type
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
-     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - returns: the result of the the query, or `nil` if no match was found. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: QueryClause...) -> U? {
+    public func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: QueryClause...) throws -> U? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryValue(from, selectClause, queryClauses)
+        return try self.context.queryValue(from, selectClause, queryClauses)
    }
    
    /**
@@ -426,15 +442,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - parameter from: a `From` clause indicating the entity type
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
-     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - returns: the result of the the query, or `nil` if no match was found. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: [QueryClause]) -> U? {
+    public func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: [QueryClause]) throws -> U? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryValue(from, selectClause, queryClauses)
+        return try self.context.queryValue(from, selectClause, queryClauses)
    }
    
    /**
@@ -449,15 +466,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `QueryChainableBuilderType` indicating the property/aggregate to fetch and the series of queries for the request.
-     - returns: the result of the the query as specified by the `QueryChainableBuilderType`
+     - returns: the result of the the query as specified by the `QueryChainableBuilderType`, or `nil` if no match was found.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryValue<B: QueryChainableBuilderType>(_ clauseChain: B) -> B.ResultType? where B.ResultType: QueryableAttributeType {
+    public func queryValue<B: QueryChainableBuilderType>(_ clauseChain: B) throws -> B.ResultType? where B.ResultType: QueryableAttributeType {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryValue(clauseChain.from, clauseChain.select, clauseChain.queryClauses)
+        return try self.context.queryValue(clauseChain.from, clauseChain.select, clauseChain.queryClauses)
    }
    
    /**
@@ -469,14 +487,15 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: QueryClause...) -> [[String: Any]]? {
+    public func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: QueryClause...) throws -> [[String: Any]] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryAttributes(from, selectClause, queryClauses)
+        return try self.context.queryAttributes(from, selectClause, queryClauses)
    }
    
    /**
@@ -488,14 +507,15 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: [QueryClause]) -> [[String: Any]]? {
+    public func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: [QueryClause]) throws -> [[String: Any]] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryAttributes(from, selectClause, queryClauses)
+        return try self.context.queryAttributes(from, selectClause, queryClauses)
    }
    
    /**
@@ -520,14 +540,15 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     ```
     - parameter clauseChain: a `QueryChainableBuilderType` indicating the properties to fetch and the series of queries for the request.
     - returns: the result of the the query as specified by the `QueryChainableBuilderType`
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryAttributes<B: QueryChainableBuilderType>(_ clauseChain: B) -> [[String: Any]]? where B.ResultType == NSDictionary {
+    public func queryAttributes<B: QueryChainableBuilderType>(_ clauseChain: B) throws -> [[String: Any]] where B.ResultType == NSDictionary {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryAttributes(clauseChain.from, clauseChain.select, clauseChain.queryClauses)
+        return try self.context.queryAttributes(clauseChain.from, clauseChain.select, clauseChain.queryClauses)
    }
    
    
@@ -540,13 +561,4 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
        
        return self.context
    }
-    
-    
-    // MARK: Obsoleted
-    
-    @available(*, obsoleted: 3.1, renamed: "unsafeContext()")
-    public func internalContext() -> NSManagedObjectContext {
-        
-        fatalError()
-    }
 }
--- a/Sources/BaseDataTransaction.swift
+++ b/Sources/BaseDataTransaction.swift
@@ -2,7 +2,7 @@
 //  BaseDataTransaction.swift
 //  CoreStore
 //
-//  Copyright © 2014 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -181,7 +181,7 @@ public /*abstract*/ class BaseDataTransaction {
     */
    public func delete<D: DynamicObject>(_ object1: D?, _ object2: D?, _ objects: D?...) {
        
-        self.delete(([object1, object2] + objects).flatMap { $0 })
+        self.delete(([object1, object2] + objects).compactMap { $0 })
    }
    
    /**
@@ -213,6 +213,25 @@ public /*abstract*/ class BaseDataTransaction {
    
    
    // MARK: Inspecting Pending Objects
+
+    /**
+     Returns `true` if the object has any property values changed. This method should not be called after the `commit()` method was called.
+
+     - parameter entity: the `DynamicObject` instance
+     - returns: `true` if the object has any property values changed.
+     */
+    public func objectHasPersistentChangedValues<D: DynamicObject>(_ entity: D) -> Bool {
+
+        CoreStore.assert(
+            self.isRunningInAllowedQueue(),
+            "Attempted to access inserted objects from a \(cs_typeName(self)) outside its designated queue."
+        )
+        CoreStore.assert(
+            !self.isCommitted,
+            "Attempted to access inserted objects from an already committed \(cs_typeName(self))."
+        )
+        return entity.cs_toRaw().hasPersistentChangedValues
+    }
    
    /**
     Returns all pending `DynamicObject`s of the specified type that were inserted to the transaction. This method should not be called after the `commit()` method was called.
@@ -223,14 +242,14 @@ public /*abstract*/ class BaseDataTransaction {
    public func insertedObjects<D: DynamicObject>(_ entity: D.Type) -> Set<D> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access inserted objects from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
            !self.isCommitted,
            "Attempted to access inserted objects from an already committed \(cs_typeName(self))."
        )
-        return Set(self.context.insertedObjects.flatMap({ entity.cs_matches(object: $0) ? entity.cs_fromRaw(object: $0) : nil }))
+        return Set(self.context.insertedObjects.compactMap({ entity.cs_matches(object: $0) ? entity.cs_fromRaw(object: $0) : nil }))
    }
    
    /**
@@ -241,7 +260,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func insertedObjectIDs() -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access inserted object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -260,14 +279,14 @@ public /*abstract*/ class BaseDataTransaction {
    public func insertedObjectIDs<D: DynamicObject>(_ entity: D.Type) -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access inserted object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
            !self.isCommitted,
            "Attempted to access inserted objects IDs from an already committed \(cs_typeName(self))."
        )
-        return Set(self.context.insertedObjects.flatMap({ entity.cs_matches(object: $0) ? $0.objectID : nil }))
+        return Set(self.context.insertedObjects.compactMap({ entity.cs_matches(object: $0) ? $0.objectID : nil }))
    }
    
    /**
@@ -279,14 +298,14 @@ public /*abstract*/ class BaseDataTransaction {
    public func updatedObjects<D: DynamicObject>(_ entity: D.Type) -> Set<D> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access updated objects from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
            !self.isCommitted,
            "Attempted to access updated objects from an already committed \(cs_typeName(self))."
        )
-        return Set(self.context.updatedObjects.flatMap({ entity.cs_matches(object: $0) ? entity.cs_fromRaw(object: $0) : nil }))
+        return Set(self.context.updatedObjects.compactMap({ entity.cs_matches(object: $0) ? entity.cs_fromRaw(object: $0) : nil }))
    }
    
    /**
@@ -297,7 +316,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func updatedObjectIDs() -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access updated object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -316,14 +335,14 @@ public /*abstract*/ class BaseDataTransaction {
    public func updatedObjectIDs<D: DynamicObject>(_ entity: D.Type) -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access updated object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
            !self.isCommitted,
            "Attempted to access updated object IDs from an already committed \(cs_typeName(self))."
        )
-        return Set(self.context.updatedObjects.flatMap({ entity.cs_matches(object: $0) ? $0.objectID : nil }))
+        return Set(self.context.updatedObjects.compactMap({ entity.cs_matches(object: $0) ? $0.objectID : nil }))
    }
    
    /**
@@ -335,14 +354,14 @@ public /*abstract*/ class BaseDataTransaction {
    public func deletedObjects<D: DynamicObject>(_ entity: D.Type) -> Set<D> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access deleted objects from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
            !self.isCommitted,
            "Attempted to access deleted objects from an already committed \(cs_typeName(self))."
        )
-        return Set(self.context.deletedObjects.flatMap({ entity.cs_matches(object: $0) ? entity.cs_fromRaw(object: $0) : nil }))
+        return Set(self.context.deletedObjects.compactMap({ entity.cs_matches(object: $0) ? entity.cs_fromRaw(object: $0) : nil }))
    }
    
    /**
@@ -354,7 +373,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func deletedObjectIDs() -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access deleted object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -373,14 +392,14 @@ public /*abstract*/ class BaseDataTransaction {
    public func deletedObjectIDs<D: DynamicObject>(_ entity: D.Type) -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access deleted object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
            !self.isCommitted,
            "Attempted to access deleted object IDs from an already committed \(cs_typeName(self))."
        )
-        return Set(self.context.deletedObjects.flatMap({ entity.cs_matches(object: $0) ? $0.objectID : nil }))
+        return Set(self.context.deletedObjects.compactMap({ entity.cs_matches(object: $0) ? $0.objectID : nil }))
    }
    
    
@@ -442,49 +461,4 @@ public /*abstract*/ class BaseDataTransaction {
        
        self.context.reset()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use insertedObjects(_:) and pass the specific entity type")
-    public func insertedObjects() -> Set<NSManagedObject> {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to access inserted objects from a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to access inserted objects from an already committed \(cs_typeName(self))."
-        )
-        return self.context.insertedObjects
-    }
-    
-    @available(*, deprecated, message: "Use updatedObjects(_:) and pass the specific entity type")
-    public func updatedObjects() -> Set<NSManagedObject> {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to access updated objects from a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to access updated objects from an already committed \(cs_typeName(self))."
-        )
-        return self.context.updatedObjects
-    }
-    
-    @available(*, deprecated, message: "Use deletedObjects(_:) and pass the specific entity type")
-    public func deletedObjects() -> Set<NSManagedObject> {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to access deleted objects from a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to access deleted objects from an already committed \(cs_typeName(self))."
-        )
-        return self.context.deletedObjects
-    }
 }
--- a/Sources/CSAsynchronousDataTransaction.swift
+++ b/Sources/CSAsynchronousDataTransaction.swift
@@ -2,7 +2,7 @@
 //  CSAsynchronousDataTransaction.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -156,41 +156,6 @@ public final class CSAsynchronousDataTransaction: CSBaseDataTransaction, CoreSto
        
        super.init(swiftValue)
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new -[CSAsynchronousDataTransaction commitWithSuccess:failure:] method.")
-    @objc
-    public func commitWithCompletion(_ completion: ((_ result: CSSaveResult) -> Void)?) {
-        
-        CoreStore.assert(
-            self.bridgeToSwift.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to commit a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.bridgeToSwift.isCommitted,
-            "Attempted to commit a \(cs_typeName(self)) more than once."
-        )
-        self.bridgeToSwift.commit { (result) in
-            
-            completion?(result.bridgeToObjectiveC)
-        }
-    }
-    
-    @available(*, deprecated, message: "Secondary tasks spawned from CSAsynchronousDataTransactions and CSSynchronousDataTransactions are no longer supported. ")
-    @objc
-    @discardableResult
-    public func beginSynchronous(_ closure: @escaping (_ transaction: CSSynchronousDataTransaction) -> Void) -> CSSaveResult? {
-        
-        return bridge {
-            
-            self.bridgeToSwift.beginSynchronous { (transaction) in
-                
-                closure(transaction.bridgeToObjectiveC)
-            }
-        }
-    }
 }


--- a/Sources/CSBaseDataTransaction+Querying.swift
+++ b/Sources/CSBaseDataTransaction+Querying.swift
@@ -2,7 +2,7 @@
 //  CSBaseDataTransaction+Querying.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSBaseDataTransaction

-public extension CSBaseDataTransaction {
+extension CSBaseDataTransaction {
    
    /**
     Fetches the `NSManagedObject` instance in the transaction's context from a reference created from a transaction or from a different managed object context.
@@ -93,7 +93,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.fetchOne(from, fetchClauses)
+        return (try? self.swiftTransaction.context.fetchOne(from, fetchClauses))?
+            .flatMap({ $0 })
    }
    
    /**
@@ -110,7 +111,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.fetchAll(from, fetchClauses)
+        return (try? self.swiftTransaction.context.fetchAll(from, fetchClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -127,9 +129,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context
-            .fetchCount(from, fetchClauses)
-            .flatMap { NSNumber(value: $0) }
+        return (try? self.swiftTransaction.context.fetchCount(from, fetchClauses))
+            .flatMap({ NSNumber(value: $0) })
    }
    
    /**
@@ -146,7 +147,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.fetchObjectID(from, fetchClauses)
+        return (try? self.swiftTransaction.context.fetchObjectID(from, fetchClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -166,7 +168,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.queryValue(from, selectClause, queryClauses)
+        return (try? self.swiftTransaction.context.queryValue(from, selectClause, queryClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -186,6 +189,7 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.queryAttributes(from, selectClause, queryClauses)
+        return (try? self.swiftTransaction.context.queryAttributes(from, selectClause, queryClauses))
+            .flatMap({ $0 })
    }
 }
--- a/Sources/CSBaseDataTransaction.swift
+++ b/Sources/CSBaseDataTransaction.swift
@@ -2,7 +2,7 @@
 //  CSBaseDataTransaction.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -251,28 +251,4 @@ public class CSBaseDataTransaction: NSObject {
        self.swiftTransaction = swiftValue
        super.init()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use -[insertedObjectsOfType:] and pass the specific entity class")
-    @objc
-    public func insertedObjects() -> Set<NSManagedObject> {
-        
-        return self.swiftTransaction.insertedObjects()
-    }
-    
-    @available(*, deprecated, message: "Use -[updatedObjectsOfType:] and pass the specific entity class")
-    @objc
-    public func updatedObjects() -> Set<NSManagedObject> {
-        
-        return self.swiftTransaction.updatedObjects()
-    }
-    
-    @available(*, deprecated, message: "Use -[deletedObjectsOfType:] and pass the specific entity class")
-    @objc
-    public func deletedObjects() -> Set<NSManagedObject> {
-        
-        return self.swiftTransaction.deletedObjects()
-    }
 }
--- a/Sources/CSClauseTypes.swift
+++ b/Sources/CSClauseTypes.swift
@@ -2,7 +2,7 @@
 //  CSClauseTypes.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
--- a/Sources/CSCoreStore+Migrating.swift
+++ b/Sources/CSCoreStore+Migrating.swift
@@ -2,7 +2,7 @@
 //  CSCoreStore+Migrating.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSCoreStore

-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Asynchronously adds a `CSInMemoryStore` to the `defaultStack`. Migrations are also initiated by default.
--- a/Sources/CSCoreStore+Observing.swift
+++ b/Sources/CSCoreStore+Observing.swift
@@ -2,7 +2,7 @@
 //  CSCoreStore+Observing.swift
 //  CoreStore
 //
-//  Copyright © 2015 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -29,8 +29,8 @@ import CoreData

 // MARK: - CSCoreStore

-@available(OSX 10.12, *)
-public extension CSCoreStore {
+@available(macOS 10.12, *)
+extension CSCoreStore {
    
    /**
     Using the `defaultStack`, creates an `CSObjectMonitor` for the specified `NSManagedObject`. Multiple `CSObjectObserver`s may then register themselves to be notified when changes are made to the `NSManagedObject`.
--- a/Sources/CSCoreStore+Querying.swift
+++ b/Sources/CSCoreStore+Querying.swift
@@ -2,7 +2,7 @@
 //  CSCoreStore+Querying.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSCoreStore

-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Using the `defaultStack`, fetches the `NSManagedObject` instance in the transaction's context from a reference created from a transaction or from a different managed object context.
--- a/Sources/CSCoreStore+Setup.swift
+++ b/Sources/CSCoreStore+Setup.swift
@@ -2,7 +2,7 @@
 //  CSCoreStore+Setup.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSCoreStore

-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Returns the `defaultStack`'s model version. The version string is the same as the name of the version-specific .xcdatamodeld file.
@@ -125,21 +125,4 @@ public extension CSCoreStore {
        
        return self.defaultStack.addSQLiteStorageAndWait(storage, error: error)
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new +entityTypesByNameForType: method passing `[NSManagedObject class]` as argument.")
-    @objc
-    public static var entityClassesByName: [EntityName: NSManagedObject.Type] {
-        
-        return CoreStore.entityTypesByName
-    }
-    
-    @available(*, deprecated, message: "Use the new +entityTypesByNameForType: method passing `[NSManagedObject class]` as argument.")
-    @objc
-    public static func entityClassWithName(_ name: EntityName) -> NSManagedObject.Type? {
-        
-        return CoreStore.entityTypesByName[name]
-    }
 }
--- a/Sources/CSCoreStore+Transaction.swift
+++ b/Sources/CSCoreStore+Transaction.swift
@@ -2,7 +2,7 @@
 //  CSCoreStore+Transaction.swift
 //  CoreStore
 //
-//  Copyright © 2016 John Rommel Estropia
+//  Copyright © 2018 John Rommel Estropia
 //
 //  Permission is hereby granted, free of charge, to any person obtaining a copy
 //  of this software and associated documentation files (the "Software"), to deal
@@ -28,7 +28,7 @@ import Foundation

 // MARK: - CSCoreStore

-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Using the `defaultStack`, begins a transaction asynchronously where `NSManagedObject` creates, updates, and deletes can be made.
@@ -45,7 +45,7 @@ public extension CSCoreStore {
     Using the `defaultStack`, begins a transaction synchronously where `NSManagedObject` creates, updates, and deletes can be made.
     
     - parameter closure: the block where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
-     - returns: a `CSSaveResult` value indicating success or failure, or `nil` if the transaction was not comitted synchronously
+     - returns: `YES` if the commit succeeded, `NO` if the commit failed. If `NO`, the `error` argument will hold error information.
     */
    @objc
    public static func beginSynchronous(_ closure: @escaping (_ transaction: CSSynchronousDataTransaction) -> Void, error: NSErrorPointer) -> Bool {
@@ -91,15 +91,4 @@ public extension CSCoreStore {
        
        CoreStore.refreshAndMergeAllObjects()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new +[CSCoreStore beginSynchronous:error:] API that reports failure using an error instance.")
-    @objc
-    @discardableResult
-    public static func beginSynchronous(_ closure: @escaping (_ transaction: CSSynchronousDataTransaction) -> Void) -> CSSaveResult? {
-        
-        return self.defaultStack.beginSynchronous(closure)
-    }
 }
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
John Estropia	1740d168c8	Merge branch 'develop'	2019-08-27 14:38:16 +09:00
John Estropia	d42b397090	version bump	2019-08-27 14:38:05 +09:00
John Estropia	058cc1915b	fix optimization issues in release build	2019-08-27 14:21:33 +09:00
John Estropia	02d5bf85ae	fix ListMonitor demo for iOS 13	2019-08-20 12:42:34 +09:00
John Estropia	ed3d21db77	WIP: reorganization of keypath utilities (in prep for @propertyWrappers)	2019-07-09 14:50:23 +09:00
John Estropia	67bb9340c7	provide way to check if an object has updated properties	2019-07-05 19:07:25 +09:00
John Estropia	5d49bd79f2	Merge pull request #326 from cool8jay/patch-1 Update README code style.	2019-06-29 13:19:14 +09:00
John Estropia	9f397b4337	Prevent crashing when DataStack is deallocated ahead of ListMonitor and child objects	2019-06-10 18:34:15 +09:00
cool8jay	7508d150d6	Update code style. Update code style.	2019-06-05 08:43:06 +08:00
John Estropia	239db8168d	remove artifacts from Carthage	2019-05-19 01:51:46 +09:00
John Estropia	30ab4386bf	Merge branch 'develop'	2019-04-27 17:51:12 +09:00
John Estropia	08053ccb15	change protocol inheritance from class to AnyObject (as per recent Swift recommendation)	2019-04-27 17:50:55 +09:00
John Estropia	367cfea8a7	Merge branch 'develop'	2019-04-05 08:36:30 +09:00
John Estropia	5d3b7e3dab	version bump	2019-04-05 08:36:09 +09:00
John Estropia	fe7e6e7b84	Fix wrong VersionLock printing on Swift 5 (fixes #311 )	2019-04-05 08:29:14 +09:00
John Estropia	b2dba0d6fd	update pod version and jazzy docs	2019-03-31 00:29:43 +09:00
John Estropia	6f290213fa	update README	2019-03-31 00:05:13 +09:00
John Estropia	0ab52d2f43	converted *Result types to new Swift.Result	2019-03-30 23:58:26 +09:00
John Estropia	bf8a1062e0	deleted obsoleted and deprecated API	2019-03-30 23:56:39 +09:00
John Estropia	0e254867b6	update project for Swift 5 / Xcode 10.2	2019-03-30 23:36:56 +09:00
John Estropia	0376ac6908	bump	2019-02-28 18:57:28 +09:00
John Estropia	b3421888a6	version bump	2019-02-28 18:55:32 +09:00
John Estropia	7b3f4ae0a4	fix compile error	2019-02-28 17:58:17 +09:00
John Estropia	b4e12cc922	restore NSPersistentStore.affectedStores ARC bug workaround	2019-02-28 17:57:34 +09:00
John Estropia	6c282b18af	version bump	2019-02-28 13:14:27 +09:00
John Estropia	ebbde8b7b6	minor fix in demo app	2019-02-28 13:13:01 +09:00
John Estropia	a1407e4121	Revert workaround for iOS 10 NSFetchedResultsController (#100 )	2019-02-28 13:07:47 +09:00
John Estropia	99b871b97a	add missing documentations for Where.Expression, updated playgrounds	2019-02-20 18:47:29 +09:00
John Estropia	1cd3c4fcf4	fix compile error	2019-02-12 18:18:44 +09:00
John Estropia	e09ac9ee00	add macOS playground	2019-02-12 18:05:06 +09:00
John Estropia	4b0d134acb	remove swift 5 annotation	2019-02-12 18:03:59 +09:00
John Estropia	eeec3979ee	SwiftPM support	2019-02-12 15:48:50 +09:00
John Estropia	5b365c642d	add tests for expressio evaluations	2019-02-08 18:42:19 +09:00
John Estropia	635201868a	add comparison operators for Where.Expression	2019-02-08 17:16:56 +09:00
John Estropia	db4426e6b9	Swift 5 support. WIP: Support type-safe predicate expressions	2019-02-01 18:32:22 +09:00
John Estropia	41902fee2e	fix compiler errors	2019-01-31 16:50:43 +09:00
John Estropia	9239370793	Added reference comment explaining crashes on A12 devices #291	2019-01-29 14:15:01 +09:00
John Estropia	a4d2f326a5	Improve perfomance by bypassing bridging (similar to https://github.com/JohnEstropia/CoreStore/pull/288 )	2019-01-28 20:12:18 +09:00
John Estropia	9f54ec26e2	add Where initializer that can accept another Where clause	2019-01-28 20:10:15 +09:00
John Estropia	9425cb56d7	update documentation for -[CSListMonitor refetch:] to reflect actual behavior	2019-01-28 19:04:46 +09:00
John Estropia	1de56d2776	add missing From.orderBy(_:) overloads	2019-01-25 17:30:11 +09:00
John Estropia	b3261ea930	Update README.md	2019-01-24 16:12:12 +09:00
John Estropia	88dd7aef72	updated README	2019-01-24 15:32:54 +09:00
John Estropia	2863605d84	silence deprecation internal warnings	2019-01-23 12:25:52 +09:00
John Estropia	94d9116299	pod bump	2019-01-23 10:56:10 +09:00
John Estropia	57ddbbd515	make some test cases validate specific error codes from thrown errors	2019-01-23 10:55:58 +09:00
John Estropia	78954b9d78	version bump	2019-01-22 16:41:58 +09:00
John Estropia	4eb06c9858	Merge branch 'throwables' into develop	2019-01-22 16:38:57 +09:00
John Estropia	0d634c1dcc	add missing MARKs	2019-01-22 16:38:17 +09:00
John Estropia	84f3740ea1	fix unit test warnings	2019-01-18 17:30:54 +09:00
John Estropia	6dc48b6af7	Add docs for new throwing methods	2019-01-17 18:43:10 +09:00
John Estropia	09ce2816bf	Merge branch 'develop' into throwables	2019-01-16 17:03:49 +09:00
John Estropia	62e962eebe	Merge pull request #301 from ianbytchek/develop Resolve source entity and managed object attributes by name	2019-01-16 17:01:48 +09:00
John Estropia	682472c1bd	fetches, queries, and deletes are now throwable methods	2019-01-15 20:40:15 +09:00
Ian Bytchek	46ab70b839	Update TravisCI base image to Xcode 10 Replace deprecated build matrix configurations with newer alternatives.	2019-01-13 06:24:04 +00:00
Ian Bytchek	ac8304f977	Resolve source entity and managed object attributes by name Addresses #300 – see it for details. Also improves the use of whitespace consistency across the `CustomSchemaMappingProvider.swift` and uses method names for `cs_resolve…` over `cs_resolved…` for better alignment with [Swift API Design Guidelines](https://swift.org/documentation/api-design-guidelines).	2019-01-13 05:41:34 +00:00
John Estropia	5777831565	WIP: make fetching methods throwable	2019-01-11 19:52:12 +09:00
John Estropia	42d1f41939	Provide more context when failing to search for mapping models #299	2019-01-11 19:48:35 +09:00
John Estropia	8c30ec3a3d	minor fixes on Playgrounds and Demo app	2019-01-09 11:59:06 +09:00
John Estropia	237a1b648e	Assert on reserved property names	2019-01-09 11:58:37 +09:00
John Estropia	614f1572c2	print PartialObjects	2018-12-26 22:35:28 +08:00
John Estropia	a48f16aa8c	add Jazzy docs	2018-12-19 16:27:05 +09:00
John Estropia	cdbadae002	added comments to playground	2018-12-18 18:44:47 +09:00
John Estropia	4a28a39df6	removed long-standing workaround for NSFetchedResultsController bugs since they seem to be fixed	2018-12-18 18:43:36 +09:00
John Estropia	5febf2542d	added playgrounds just to show off	2018-12-14 19:28:55 +09:00
John Estropia	c21ab11a41	format header comment	2018-12-14 18:21:41 +09:00
John Estropia	10cd18dbf0	prototype for CoreStoreObject property observers (a.k.a. KVO)	2018-12-14 18:20:42 +09:00
John Estropia	8409a13289	Merge pull request #288 from ruslanskorb/list-monitor-number-of-objects-performance [ListMonitor] Fix performance of `numberOfObjects()`.	2018-12-06 18:53:06 +09:00
Ruslan Skorb	a9a73fa5c4	[ListMonitor] [numberOfObjects()] Return `count` of `fetchedObjects`. Casting `fetchedObjects` to `NSArray?` has better performance. https://github.com/JohnEstropia/CoreStore/pull/288	2018-12-06 10:56:30 +02:00
John Estropia	82cae2e11e	Merge pull request #292 from eliseo-juan/patch-1 Fix documentation	2018-12-06 10:54:50 +09:00
John Estropia	42caee2418	Merge pull request #287 from ruslanskorb/list-monitor-subscript-performance [ListMonitor] Fix performance of `subscript(safeSectionIndex:safeItemIndex:)`.	2018-12-06 10:54:12 +09:00
Eliseo Juan Quintanilla	1dea1d0d06	Fix documentation Changed attribtue to attribute	2018-12-05 10:09:05 +01:00
John Estropia	d344b9d878	minimum deployment version bumped to iOS 10, macOS 10.12, tvOS 10, watchOS 3. Deprecated iCloud Storage	2018-12-05 17:31:16 +09:00
John Estropia	95c1ce52cc	Merge branch 'develop' of github.com:JohnEstropia/CoreStore into develop	2018-12-05 16:17:03 +09:00
John Estropia	cc346816d6	Added new error for cases when addStorageAndWait() is used with .allowSynchronousLightweightMigration but migrations are only allowed asynchronously (related to #277 )	2018-12-05 16:15:20 +09:00
John Estropia	f14b561c33	Merge pull request #275 from DmitrijMaz/fix_queueing Fix queue validation for UnsafeDataTransaction	2018-12-05 11:02:47 +09:00
Ruslan Skorb	6f655951aa	[ListMonitor] [numberOfObjects()] Calculate the number of objects in all sections by summing the number of objects stored in `NSFetchedResultsSectionInfo`. There is a performance problem in Swift when calling `count` method on an array with a large number of fetched objects. It requires casting the array between Objective-C and Swift, that is pretty slow.	2018-11-24 16:24:14 +02:00
Ruslan Skorb	ff8fbae568	[ListMonitor] [subscript(safeSectionIndex:safeItemIndex:)] Use `subscript(indexPath:)` after the validation of `sectionIndex` and `itemIndex` to get an object. There is a performance problem in Swift when getting an object from the Objective-C array with a large number of objects using subscript. It requires casting the array between Objective-C and Swift, that is pretty slow.	2018-11-24 16:23:36 +02:00
Dmitry Mazurenko	4d4b02d076	Fix queue validation for UnsafeDataTransaction	2018-10-10 16:48:04 +03:00
John Estropia	06c0981ded	debug string for CoreStoreObject	2018-09-24 00:49:53 +09:00
John Estropia	20d581d536	version bump	2018-09-19 18:48:45 +09:00
John Estropia	45e110755d	deleted unnecessary Equatable and Hashable custom implementations	2018-09-19 11:06:19 +09:00
John Estropia	ab40532801	fix issue with early-deallocated CoreStoreObjects	2018-09-18 23:50:14 +09:00
John Estropia	40f458a09c	Merge branch 'develop' of github.com:JohnEstropia/CoreStore into develop	2018-09-15 12:56:21 +09:00
John Estropia	1ad233ca9d	Swift 4.2 support	2018-09-15 12:56:08 +09:00
John Estropia	3a8e394272	Merge pull request #269 from congbach/develop Fixed bug where ListObjectObserver didUpdateObject was not called on …	2018-09-10 19:30:06 +09:00
Ken Bach	1f54daa528	Fixed bug where ListObjectObserver.didUpdateObject was not called on watchos.	2018-08-21 22:47:54 +01:00
John Estropia	f25879b6fe	fix compile error on tvOS and watchOS	2018-08-09 21:04:09 +09:00
John Estropia	8fa3109e91	version bump	2018-08-09 20:45:46 +09:00
John Estropia	808e8ff97a	stabilize NSProgress when lightweight migration falls back to InferredMappingModel	2018-08-09 18:18:21 +09:00
John Estropia	30685d4355	Use InferredMappingModel in case lightweight migration fails for some reason	2018-08-09 02:09:54 +09:00
John Estropia	7152962026	revert	2018-08-09 01:39:16 +09:00
John Estropia	91735e38d1	Fix issue where CoreStoreObjects nested in a type is mismatching classnames before migration	2018-08-08 23:52:47 +09:00
John Estropia	333a50ad9e	Merge pull request #256 from vGubriienko/demo-fix Fixed issue with brightness observing in the Demo	2018-08-03 17:44:40 +09:00
John Rommel Estropia	b7a602fc67	iOS 11 Core Data changes	2018-07-29 23:33:51 +09:00
Viktor Gubriienko	2ff7ecef96	Fixed issue with brightness observing in the Demo	2018-06-12 17:53:00 +03:00
John Rommel Estropia	e3f9139304	version bump	2018-06-10 11:52:47 +09:00
John Rommel Estropia	4aa461872f	specify swift version in podspec	2018-06-10 11:47:03 +09:00
John Rommel Estropia	3d43314076	update readme	2018-04-14 09:05:13 +09:00
John Rommel Estropia	7b1075b759	support compound indexes and unique constraints on CoreStore properties	2018-03-17 23:56:42 +09:00
John Rommel Estropia	0c29e07ddb	support allowsExternalBinaryDataStorage option on Transformable CoreStoreObject properties	2018-03-17 23:56:01 +09:00
John Rommel Estropia	ce91cf22f9	Swift 4.1 support	2018-03-17 23:53:24 +09:00
John Rommel Estropia	2dd033c002	Merge branch 'develop' into prototype/Swift_4_1	2018-03-10 21:09:29 +09:00
John Rommel Estropia	c7fcba112e	Fix bug where ListMonitor sectionIndexTitles are not updated on refetch (fixes #218 )	2018-03-10 21:09:18 +09:00
John Rommel Estropia	c8b1c4358f	Fix bug where ListMonitor sectionIndexTitles are not updated on refetch (fixes #218 )	2018-03-10 21:08:40 +09:00
John Rommel Estropia	5431e2e974	Swift 4.1 support	2018-03-10 21:07:53 +09:00
John Rommel Estropia	83e6082c56	Merge branch 'develop' of github.com:JohnEstropia/CoreStore into develop	2018-01-07 23:25:11 +09:00
John Rommel Estropia	c7bdbbde57	convert value to native type before formatting predicates	2018-01-07 21:06:35 +09:00
John Estropia	abf15c8aa8	Merge pull request #232 from kf99916/external-storage-migration External storage migration	2018-01-06 17:48:38 +09:00
Zheng-Xiang Ke	d9db7e4a82	Typo	2018-01-06 15:00:53 +08:00
John Estropia	65dbc22ddd	Merge pull request #231 from doodzik/patch-1 Fix syntax error in readme	2018-01-06 15:11:48 +09:00
Zheng-Xiang Ke	51961dd737	Migrate external storage	2018-01-06 10:22:44 +08:00
Frederik Dudzik	18a7055cdf	Fix syntax error	2018-01-05 21:16:04 +01:00