skip observer testing on macOS

Fixes #98 (deadlock when merge happens while main queue is querying)

.travis.yml

@@ -12,10 +12,11 @@ env:
   matrix:
     - DESTINATION="OS=10.0,name=iPhone 7"          SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="NO"
     - DESTINATION="OS=9.0,name=iPhone 6 Plus"      SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.4,name=iPhone 6"           SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.3,name=iPhone 5S"          SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.2,name=iPhone 5"           SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.1,name=iPhone 4S"          SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="YES"
+# iOS 8 testing currently broken on Xcode 8
+#    - DESTINATION="OS=8.4,name=iPhone 6"           SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="NO"
+#    - DESTINATION="OS=8.3,name=iPhone 5s"          SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="NO"
+#    - DESTINATION="OS=8.2,name=iPhone 5"           SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="NO"
+#    - DESTINATION="OS=8.1,name=iPhone 4s"          SCHEME="CoreStore iOS"     SDK=iphonesimulator10.0  RUN_TESTS="YES" POD_LINT="YES"
     - DESTINATION="arch=x86_64"                    SCHEME="CoreStore OSX"     SDK=macosx10.12          RUN_TESTS="YES" POD_LINT="NO"
     - DESTINATION="OS=3.0,name=Apple Watch - 42mm" SCHEME="CoreStore watchOS" SDK=watchsimulator3.0    RUN_TESTS="NO"  POD_LINT="NO"
     - DESTINATION="OS=2.2,name=Apple Watch - 42mm" SCHEME="CoreStore watchOS" SDK=watchsimulator3.0    RUN_TESTS="NO"  POD_LINT="NO"

CoreStore.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name = "CoreStore"
-    s.version = "2.1.0"
+    s.version = "2.1.2"
     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"

CoreStore.xcodeproj/project.pbxproj

@@ -145,10 +145,6 @@
 		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.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */; };
-		B52661421CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */; };
-		B52661431CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */; };
-		B52661441CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.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 */; };
@@ -600,7 +596,6 @@
 		B525577F1D029D2500E51965 /* TweakTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TweakTests.swift; sourceTree = "<group>"; };
 		B52557831D02A07400E51965 /* SectionByTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SectionByTests.swift; sourceTree = "<group>"; };
 		B52557871D02DE8100E51965 /* FetchTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FetchTests.swift; sourceTree = "<group>"; };
-		B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CoreStoreFetchRequest.swift; sourceTree = "<group>"; };
 		B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSSaveResult.swift; sourceTree = "<group>"; };
 		B52DD1741BE1F8CC00949AFE /* CoreStore.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = CoreStore.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		B52DD17D1BE1F8CC00949AFE /* CoreStoreTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = CoreStoreTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -1178,7 +1173,6 @@
 				B5E834BA1B7691F3001D3D50 /* Functions.swift */,
 				B5FAD6AB1B51285300714891 /* MigrationManager.swift */,
 				B5E84F2B1AFF849C0064E85B /* NotificationObserver.swift */,
-				B526613F1CADD585007B85D9 /* CoreStoreFetchRequest.swift */,
 				B5E84F2C1AFF849C0064E85B /* NSManagedObjectContext+CoreStore.swift */,
 				B5E84F351AFF85470064E85B /* NSManagedObjectContext+Querying.swift */,
 				B5E84F321AFF85470064E85B /* NSManagedObjectContext+Setup.swift */,
@@ -1400,7 +1394,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0700;
+				LastUpgradeCheck = 0800;
 				ORGANIZATIONNAME = "John Rommel Estropia";
 				TargetAttributes = {
 					2F03A52F19C5C6DA005002A5 = {
@@ -1558,7 +1552,6 @@
 				B53FB9FE1CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
 				B5DBE2D21C991B3E00B5CEFA /* CSDataStack.swift in Sources */,
 				B50392F91C478FF3009900CA /* NSManagedObject+Transaction.swift in Sources */,
-				B52661401CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */,
 				B53FBA181CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				B5202CFA1C04688100DED140 /* NSFetchedResultsController+Convenience.swift in Sources */,
 				B5519A591CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
@@ -1708,7 +1701,6 @@
 				82BA18B41C4BBD3900A0916E /* BaseDataTransaction+Importing.swift in Sources */,
 				B53FBA1A1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				82BA18CA1C4BBD5900A0916E /* MigrationResult.swift in Sources */,
-				B52661421CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */,
 				B5519A5A1CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
 				B5ECDBE11CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
 				82BA18C11C4BBD5300A0916E /* CoreStore+Observing.swift in Sources */,
@@ -1857,7 +1849,6 @@
 				B52DD1C71BE1F94600949AFE /* NSManagedObjectContext+Querying.swift in Sources */,
 				B52DD1C81BE1F94600949AFE /* NSManagedObjectContext+Setup.swift in Sources */,
 				B52DD1C31BE1F94600949AFE /* NotificationObserver.swift in Sources */,
-				B52661441CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */,
 				B52DD1A81BE1F93200949AFE /* DataStack+Querying.swift in Sources */,
 				B5220E221D130818009BC71E /* CSSectionBy.swift in Sources */,
 				B52DD1BC1BE1F94000949AFE /* MigrationResult.swift in Sources */,
@@ -2001,7 +1992,6 @@
 				B53FBA011CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
 				B5DBE2D41C991B3E00B5CEFA /* CSDataStack.swift in Sources */,
 				B50392FA1C47963F009900CA /* NSManagedObject+Transaction.swift in Sources */,
-				B52661431CADD585007B85D9 /* CoreStoreFetchRequest.swift in Sources */,
 				B53FBA1B1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				B5519A5B1CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
 				B5ECDBE21CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
@@ -2106,8 +2096,10 @@
 				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_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
@@ -2117,6 +2109,7 @@
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
@@ -2162,8 +2155,10 @@
 				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_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
@@ -2173,6 +2168,7 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_PREPROCESSOR_DEFINITIONS = "USE_FRAMEWORKS=1";
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
@@ -2188,7 +2184,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.CoreStore;
 				PRODUCT_NAME = CoreStore;
 				SDKROOT = iphoneos;
-				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VALIDATE_PRODUCT = YES;
@@ -2202,6 +2198,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -2219,6 +2216,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -2268,6 +2266,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				"CODE_SIGN_IDENTITY[sdk=appletvos*]" = "";
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -2287,6 +2286,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				"CODE_SIGN_IDENTITY[sdk=appletvos*]" = "";
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -2339,7 +2339,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
-				CODE_SIGN_IDENTITY = "-";
+				CODE_SIGN_IDENTITY = "";
 				COMBINE_HIDPI_IMAGES = YES;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				DEFINES_MODULE = YES;
@@ -2361,7 +2361,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
-				CODE_SIGN_IDENTITY = "-";
+				CODE_SIGN_IDENTITY = "";
 				COMBINE_HIDPI_IMAGES = YES;
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
@@ -2421,6 +2421,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				"CODE_SIGN_IDENTITY[sdk=watchos*]" = "";
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
@@ -2441,6 +2442,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				"CODE_SIGN_IDENTITY[sdk=watchos*]" = "";
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEFINES_MODULE = YES;

CoreStore.xcodeproj/project.xcworkspace/xcshareddata/CoreStore.xcscmblueprint

@@ -10,10 +10,10 @@
   "DVTSourceControlWorkspaceBlueprintIdentifierKey" : "F347F55F-7F5C-4476-9148-6E902F06E4AD",
   "DVTSourceControlWorkspaceBlueprintWorkingCopyPathsKey" : {
     "8B2E522D57154DFA93A06982C36315ECBEA4FA97" : "CoreStoreLibraries\/GCDKit",
-    "4B60F1BCB491FF717C56441AE7783C74F417BE48" : "CoreStore"
+    "4B60F1BCB491FF717C56441AE7783C74F417BE48" : "CoreStore\/"
   },
   "DVTSourceControlWorkspaceBlueprintNameKey" : "CoreStore",
-  "DVTSourceControlWorkspaceBlueprintVersion" : 203,
+  "DVTSourceControlWorkspaceBlueprintVersion" : 204,
   "DVTSourceControlWorkspaceBlueprintRelativePathToProjectKey" : "CoreStore.xcodeproj",
   "DVTSourceControlWorkspaceBlueprintRemoteRepositoriesKey" : [
     {

CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore OSX.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0710"
+   LastUpgradeVersion = "0800"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore iOS.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0700"
+   LastUpgradeVersion = "0800"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -11,8 +11,7 @@
             buildForRunning = "YES"
             buildForProfiling = "YES"
             buildForArchiving = "YES"
-            buildForAnalyzing = "YES"
-            hideIssues = "NO">
+            buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "2F03A52F19C5C6DA005002A5"
@@ -26,8 +25,7 @@
             buildForRunning = "NO"
             buildForProfiling = "NO"
             buildForArchiving = "NO"
-            buildForAnalyzing = "NO"
-            hideIssues = "NO">
+            buildForAnalyzing = "NO">
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "2F03A53A19C5C6DA005002A5"

CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore tvOS.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0720"
+   LastUpgradeVersion = "0800"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore watchOS.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0700"
+   LastUpgradeVersion = "0800"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

CoreStoreTests/FromTests.swift

@@ -74,33 +74,33 @@ final class FromTests: BaseTestCase {
                 
                 let from = From<TestEntity1>()
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["PF_DEFAULT_CONFIGURATION_NAME"])
             }
             do {
                 
                 let from = From<TestEntity1>("Config1")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
         }
@@ -115,102 +115,102 @@ final class FromTests: BaseTestCase {
                 
                 let from = From<TestEntity1>()
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["Config1"])
             }
             do {
                 
                 let from = From<TestEntity1>("Config1")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["Config1"])
             }
             do {
                 
                 let from = From<TestEntity1>("Config2")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
             do {
                 
                 let from = From<TestEntity2>()
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
             do {
                 
                 let from = From<TestEntity2>("Config1")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
             do {
                 
                 let from = From<TestEntity2>("Config2")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
         }
@@ -225,99 +225,99 @@ final class FromTests: BaseTestCase {
                 
                 let from = From<TestEntity1>()
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.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 = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["Config1"])
             }
             do {
                 
                 let from = From<TestEntity1>("Config2")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
             do {
                 
                 let from = From<TestEntity2>()
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["PF_DEFAULT_CONFIGURATION_NAME"])
             }
             do {
                 
                 let from = From<TestEntity2>("Config1")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
             do {
                 
                 let from = From<TestEntity2>("Config2")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
         }
@@ -332,96 +332,96 @@ final class FromTests: BaseTestCase {
                 
                 let from = From<TestEntity1>()
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["Config1"])
             }
             do {
                 
                 let from = From<TestEntity1>("Config1")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["Config1"])
             }
             do {
                 
                 let from = From<TestEntity1>("Config2")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
             do {
                 
                 let from = From<TestEntity2>()
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["Config2"])
             }
             do {
                 
                 let from = From<TestEntity2>("Config1")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = self.expectLogger([.LogWarning]) {
                     
                     from.applyToFetchRequest(request, context: dataStack.mainContext)
                 }
                 XCTAssertFalse(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertTrue(affectedConfigurations.isEmpty)
             }
             do {
                 
                 let from = From<TestEntity2>("Config2")
                 
-                let request = NSFetchRequest()
+                let request = CoreStoreFetchRequest()
                 let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
                 XCTAssertTrue(storesFound)
                 XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.affectedStores)
+                XCTAssertNotNil(request.safeAffectedStores)
                 
                 XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                 
-                let affectedConfigurations = request.affectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
                 XCTAssertEqual(affectedConfigurations, ["Config2"])
             }
         }

CoreStoreTests/GroupByTests.swift

@@ -68,7 +68,7 @@ final class GroupByTests: BaseTestCase {
             
             let groupBy = GroupBy("testString")
             
-            let request = NSFetchRequest()
+            let request = CoreStoreFetchRequest()
             _ = From(TestEntity1).applyToFetchRequest(request, context: dataStack.mainContext)
             groupBy.applyToFetchRequest(request)
             

CoreStoreTests/OrderByTests.swift

@@ -179,7 +179,7 @@ final class OrderByTests: XCTestCase {
     dynamic func test_ThatOrderByClauses_ApplyToFetchRequestsCorrectly() {
         
         let orderBy = OrderBy(.Ascending("key"))
-        let request = NSFetchRequest()
+        let request = CoreStoreFetchRequest()
         orderBy.applyToFetchRequest(request)
         XCTAssertNotNil(request.sortDescriptors)
         XCTAssertEqual(request.sortDescriptors ?? [], orderBy.sortDescriptors)

CoreStoreTests/TransactionTests.swift

@@ -345,6 +345,107 @@ final class TransactionTests: BaseTestCase {
         }
     }
     
+    #if os(iOS) || os(watchOS) || os(tvOS)
+    
+    @objc
+    dynamic func test_ThatSynchronousTransactions_CanCommitWithoutWaitingForMerges() {
+        
+        self.prepareStack { (stack) in
+            
+            let observer = TestListObserver()
+            let monitor = stack.monitorList(
+                From(TestEntity1),
+                OrderBy(.Ascending("testEntityID"))
+            )
+            monitor.addObserver(observer)
+            
+            XCTAssertFalse(monitor.hasObjects())
+            
+            var events = 0
+            let willChangeExpectation = self.expectationForNotification(
+                "listMonitorWillChange:",
+                object: observer,
+                handler: { (note) -> Bool in
+                    
+                    XCTAssertEqual(events, 0)
+                    XCTAssertEqual((note.userInfo ?? [:]), NSDictionary())
+                    defer {
+                        
+                        events += 1
+                    }
+                    return events == 0
+                }
+            )
+            let didInsertObjectExpectation = self.expectationForNotification(
+                "listMonitor:didInsertObject:toIndexPath:",
+                object: observer,
+                handler: { (note) -> Bool in
+                    
+                    XCTAssertEqual(events, 1)
+                    
+                    let userInfo = note.userInfo
+                    XCTAssertNotNil(userInfo)
+                    XCTAssertEqual(
+                        Set(((userInfo as? [String: AnyObject]) ?? [:]).keys),
+                        ["indexPath", "object"]
+                    )
+                    
+                    let indexPath = userInfo?["indexPath"] as? NSIndexPath
+                    XCTAssertEqual(indexPath?.section, 0)
+                    XCTAssertEqual(indexPath?.row, 0)
+                    
+                    let object = userInfo?["object"] as? TestEntity1
+                    XCTAssertEqual(object?.testBoolean, NSNumber(bool: true))
+                    XCTAssertEqual(object?.testNumber, NSNumber(integer: 1))
+                    XCTAssertEqual(object?.testDecimal, NSDecimalNumber(string: "1"))
+                    XCTAssertEqual(object?.testString, "nil:TestEntity1:1")
+                    defer {
+                        
+                        events += 1
+                    }
+                    return events == 1
+                }
+            )
+            let didChangeExpectation = self.expectationForNotification(
+                "listMonitorDidChange:",
+                object: observer,
+                handler: { (note) -> Bool in
+                    
+                    XCTAssertEqual((note.userInfo ?? [:]), NSDictionary())
+                    defer {
+                        
+                        events += 1
+                    }
+                    return events == 2
+                }
+            )
+            let saveExpectation = self.expectationWithDescription("save")
+            stack.beginSynchronous { (transaction) in
+                
+                let object = transaction.create(Into(TestEntity1))
+                object.testBoolean = NSNumber(bool: true)
+                object.testNumber = NSNumber(integer: 1)
+                object.testDecimal = NSDecimalNumber(string: "1")
+                object.testString = "nil:TestEntity1:1"
+                
+                switch transaction.commit() {
+                    
+                case .Success(let hasChanges):
+                    XCTAssertTrue(hasChanges)
+                    saveExpectation.fulfill()
+                    
+                default:
+                    XCTFail()
+                }
+            }
+            XCTAssertEqual(events, 0)
+            XCTAssertEqual(monitor.numberOfObjects(), 0)
+            self.waitAndCheckExpectations()
+        }
+    }
+    
+    #endif
+    
     @objc
     dynamic func test_ThatAsynchronousTransactions_CanPerformCRUDs() {
         

CoreStoreTests/TweakTests.swift

@@ -43,7 +43,7 @@ final class TweakTests: XCTestCase {
             $0.fetchLimit = 200
             $0.predicate = predicate
         }
-        let request = NSFetchRequest()
+        let request = CoreStoreFetchRequest()
         tweak.applyToFetchRequest(request)
         XCTAssertEqual(request.fetchOffset, 100)
         XCTAssertEqual(request.fetchLimit, 200)

CoreStoreTests/WhereTests.swift

@@ -142,7 +142,7 @@ final class WhereTests: XCTestCase {
     dynamic func test_ThatWhereClauses_ApplyToFetchRequestsCorrectly() {
         
         let whereClause = Where("key", isEqualTo: "value")
-        let request = NSFetchRequest()
+        let request = CoreStoreFetchRequest()
         whereClause.applyToFetchRequest(request)
         XCTAssertNotNil(request.predicate)
         XCTAssertEqual(request.predicate, whereClause.predicate)

Sources/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>2.0.6</string>
+	<string>2.1.2</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

Sources/Internal/CoreStoreFetchRequest.swift

@@ -1,42 +0,0 @@
-//
-//  CoreStoreFetchRequest.swift
-//  CoreStore
-//
-//  Copyright © 2016 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 Foundation
-import CoreData
-
-
-// MARK: - CoreStoreFetchRequest
-
-// Bugfix for NSFetchRequest messing up memory management for `affectedStores`
-// http://stackoverflow.com/questions/14396375/nsfetchedresultscontroller-crashes-in-ios-6-if-affectedstores-is-specified
-internal final class CoreStoreFetchRequest: NSFetchRequest {
-    
-    @objc
-    override var affectedStores: [NSPersistentStore]? {
-        
-        get { return super.affectedStores }
-        set { super.affectedStores = newValue }
-    }
-}

Sources/Internal/NSManagedObjectContext+Transaction.swift

@@ -101,8 +101,8 @@ internal extension NSManagedObjectContext {
     }
     
     @nonobjc
-    internal func saveSynchronously() -> SaveResult {
-        
+    internal func saveSynchronously(waitForMerge waitForMerge: Bool) -> SaveResult {
+      
         var result = SaveResult(hasChanges: false)
         
         self.performBlockAndWait {
@@ -114,7 +114,7 @@ internal extension NSManagedObjectContext {
             
             do {
                 
-                self.isSavingSynchronously = true
+                self.isSavingSynchronously = waitForMerge
                 try self.save()
                 self.isSavingSynchronously = nil
             }
@@ -131,7 +131,7 @@ internal extension NSManagedObjectContext {
             
             if let parentContext = self.parentContext where self.shouldCascadeSavesToParent {
                 
-                switch parentContext.saveSynchronously() {
+                switch parentContext.saveSynchronously(waitForMerge: waitForMerge) {
                     
                 case .Success:
                     result = SaveResult(hasChanges: true)

Sources/ObjectiveC/CoreStoreBridge.h

@@ -570,4 +570,16 @@ CORESTORE_EXTERN
 CSWhere *_Nonnull CSWherePredicate(NSPredicate *_Nonnull predicate) CORESTORE_RETURNS_RETAINED;
 
 
+#pragma mark CoreStoreFetchRequest
+
+// Bugfix for NSFetchRequest messing up memory management for `affectedStores`
+// http://stackoverflow.com/questions/14396375/nsfetchedresultscontroller-crashes-in-ios-6-if-affectedstores-is-specified
+NS_SWIFT_NAME(CoreStoreFetchRequest)
+@interface _CSFetchRequest: NSFetchRequest
+
+@property (nullable, nonatomic, copy, readonly) NSArray<NSPersistentStore *> *safeAffectedStores;
+
+@end
+
+
 #endif /* CoreStoreBridge_h */

Sources/ObjectiveC/CoreStoreBridge.m

@@ -218,3 +218,40 @@ CSWhere *_Nonnull CSWherePredicate(NSPredicate *_Nonnull predicate) CORESTORE_RE
     
     return [[CSWhere alloc] initWithPredicate:predicate];
 }
+
+
+#pragma mark CoreStoreFetchRequest
+
+@interface _CSFetchRequest ()
+
+@property (nullable, nonatomic, copy) NSArray<NSPersistentStore *> *safeAffectedStores;
+@property (nullable, nonatomic, assign) CFArrayRef releaseArray;
+
+@end
+
+@implementation _CSFetchRequest
+
+// MARK: NSFetchRequest
+
+- (void)setAffectedStores:(NSArray<NSPersistentStore *> *_Nullable)affectedStores {
+    
+    // Bugfix for NSFetchRequest messing up memory management for `affectedStores`
+    // http://stackoverflow.com/questions/14396375/nsfetchedresultscontroller-crashes-in-ios-6-if-affectedstores-is-specified
+    
+    if (NSFoundationVersionNumber < NSFoundationVersionNumber10_0) {
+        
+        self.safeAffectedStores = affectedStores;
+        [super setAffectedStores:affectedStores];
+        return;
+    }
+    if (self.releaseArray != NULL) {
+        
+        CFRelease(self.releaseArray);
+        self.releaseArray = NULL;
+    }
+    self.safeAffectedStores = affectedStores;
+    [super setAffectedStores:affectedStores];
+    self.releaseArray = CFBridgingRetain([super affectedStores]);
+}
+
+@end

Sources/Observing/ListMonitor.swift

@@ -1123,7 +1123,7 @@ public final class ListMonitor<T: NSManagedObject>: Hashable {
                 self.isPersistentStoreChanging = true
                 
                 guard let removedStores = (note.userInfo?[NSRemovedPersistentStoresKey] as? [NSPersistentStore]).flatMap(Set.init)
-                    where !Set(self.fetchedResultsController.fetchRequest.affectedStores ?? []).intersect(removedStores).isEmpty else {
+                    where !Set((self.fetchedResultsController.fetchRequest as! CoreStoreFetchRequest).safeAffectedStores ?? []).intersect(removedStores).isEmpty else {
                         
                         return
                 }
@@ -1144,7 +1144,7 @@ public final class ListMonitor<T: NSManagedObject>: Hashable {
                 
                 if !self.isPendingRefetch {
                     
-                    let previousStores = Set(self.fetchedResultsController.fetchRequest.affectedStores ?? [])
+                    let previousStores = Set((self.fetchedResultsController.fetchRequest as! CoreStoreFetchRequest).safeAffectedStores ?? [])
                     let currentStores = previousStores
                         .subtract(note.userInfo?[NSRemovedPersistentStoresKey] as? [NSPersistentStore] ?? [])
                         .union(note.userInfo?[NSAddedPersistentStoresKey] as? [NSPersistentStore] ?? [])

Sources/Transactions/SynchronousDataTransaction.swift

@@ -38,7 +38,8 @@ import CoreData
 public final class SynchronousDataTransaction: BaseDataTransaction {
     
     /**
-     Saves the transaction changes and waits for completion synchronously. This method should not be used after the `commit()` method was already called once.
+     Saves the transaction changes and waits for completion synchronously. This method should not be used after the `commit()` or `commitAndWait()` method was already called once.
+     - Important: Unlike `SynchronousDataTransaction.commit()`, this method waits for all observers to be notified of the changes before returning. This results in more predictable data update order, but may risk triggering deadlocks.
      
      - returns: a `SaveResult` containing the success or failure information
      */
@@ -55,11 +56,35 @@ public final class SynchronousDataTransaction: BaseDataTransaction {
         
         self.isCommitted = true
         
-        let result = self.context.saveSynchronously()
+        let result = self.context.saveSynchronously(waitForMerge: true)
         self.result = result
         return result
     }
     
+    /**
+     Saves the transaction changes and waits for completion synchronously. This method should not be used after the `commit()` or `commitAndWait()` method was already called once.
+     - Important: Unlike `SynchronousDataTransaction.commitAndWait()`, this method does not wait for observers to be notified of the changes before returning. This results in lower risk for deadlocks, but the updated data may not have been propagated to the `DataStack` after returning.
+     
+     - returns: a `SaveResult` containing the success or failure information
+     */
+    public func commit() -> SaveResult {
+        
+        CoreStore.assert(
+            self.transactionQueue.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.isCommitted = true
+        
+        let result = self.context.saveSynchronously(waitForMerge: false)
+        self.result = result
+        return result
+    }
+  
     /**
      Begins a child transaction synchronously where `NSManagedObject` creates, updates, and deletes can be made. This method should not be used after the `commit()` method was already called once.
      

Sources/Transactions/UnsafeDataTransaction.swift

@@ -58,7 +58,7 @@ public final class UnsafeDataTransaction: BaseDataTransaction {
      */
     public func commitAndWait() -> SaveResult {
         
-        let result = self.context.saveSynchronously()
+        let result = self.context.saveSynchronously(waitForMerge: true)
         self.result = result
         return result
     }