remov stateIDs

CoreStore.xcodeproj/project.pbxproj

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 		B53CA9A11EF1EF1600E0F440 /* PartialObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PartialObject.swift; sourceTree = "<group>"; };
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 		B53FB9FD1CAB2D2F00F0D40A /* CSMigrationResult.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSMigrationResult.swift; sourceTree = "<group>"; };
 		B53FBA031CAB300C00F0D40A /* CSMigrationType.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSMigrationType.swift; sourceTree = "<group>"; };
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@@ -931,6 +945,7 @@
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 		B559CD481CAA8C6D00E4D58B /* CSStorageInterface.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSStorageInterface.swift; sourceTree = "<group>"; };
+		B55BB4D3235012AE00C33E34 /* ObjectRepresentation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ObjectRepresentation.swift; sourceTree = "<group>"; };
 		B56007101B3F6BD500A9A8F9 /* Into.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Into.swift; sourceTree = "<group>"; };
 		B56007131B3F6C2800A9A8F9 /* SectionBy.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SectionBy.swift; sourceTree = "<group>"; };
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@@ -1294,6 +1309,17 @@
 			name = Observing;
 			sourceTree = "<group>";
 		};
+		B50564CC2350699700482308 /* Protocols */ = {
+			isa = PBXGroup;
+			children = (
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+				B5831B741F34AC7A00A9F647 /* RelationshipProtocol.swift */,
+				B50564D22350CC3100482308 /* PropertyProtocol.swift */,
+				B53D9E5823513712000F48FB /* DiffableDataSourceSnapshotProtocol.swift */,
+			);
+			name = Protocols;
+			sourceTree = "<group>";
+		};
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 			children = (
@@ -1485,7 +1511,7 @@
 				B56964D11B22FF700075EE4A /* Migrating */,
 				B5E5FA4C22D15D3C00330931 /* DataSources */,
 				B5E84F261AFF84920064E85B /* Convenience */,
-				B5E84F291AFF849C0064E85B /* Internal */,
+				B5E84F291AFF849C0064E85B /* Internals */,
 			);
 			name = Swift;
 			sourceTree = "<group>";
@@ -1550,6 +1576,7 @@
 				B5BF7FC0234D7B2E0070E741 /* LiveObject.swift */,
 				B5F8496B234898240029D57B /* ListSnapshot.swift */,
 				B5BF7FC5234D7E460070E741 /* ObjectSnapshot.swift */,
+				B55BB4D3235012AE00C33E34 /* ObjectRepresentation.swift */,
 				B50EE14123473C92009B8C47 /* CoreStoreObject+DataSources.swift */,
 				B5D8CA752346E7590055D7D1 /* DataStack+DataSources.swift */,
 				B5F335572348D75D00FD649F /* LiveResult.swift */,
@@ -1677,10 +1704,10 @@
 			name = Convenience;
 			sourceTree = "<group>";
 		};
-		B5E84F291AFF849C0064E85B /* Internal */ = {
+		B5E84F291AFF849C0064E85B /* Internals */ = {
 			isa = PBXGroup;
 			children = (
-				B5831B6F1F34AC3400A9F647 /* AttributeProtocol.swift */,
+				B50564CC2350699700482308 /* Protocols */,
 				B53B275E1EE3B92E00E9B352 /* CoreStoreManagedObject.swift */,
 				B533C4DA1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift */,
 				B5C976E61C6E3A5900B1AF90 /* Internals.CoreStoreFetchedResultsController.swift */,
@@ -1708,9 +1735,8 @@
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 				B5FEC18D1C9166E200532541 /* NSPersistentStore+Setup.swift */,
 				B59AFF401C6593E400C0ABE2 /* NSPersistentStoreCoordinator+Setup.swift */,
-				B5831B741F34AC7A00A9F647 /* RelationshipProtocol.swift */,
 			);
-			name = Internal;
+			name = Internals;
 			sourceTree = "<group>";
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@@ -2033,6 +2059,7 @@
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 			files = (
 				B5DE5230230BDA1300A22534 /* Shared.swift in Sources */,
+				B55BB4DB23503B9700C33E34 /* EnvironmentKeys.swift in Sources */,
 				B5E84F221AFF84860064E85B /* ObjectMonitor.swift in Sources */,
 				B5ECDBF91CA804FD00C7F112 /* NSManagedObjectContext+ObjectiveC.swift in Sources */,
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@@ -2047,6 +2074,7 @@
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 				B55514EA1EED8BF900BAB888 /* From+Querying.swift in Sources */,
 				B596BBBB1DD5C39F001DCDD9 /* QueryableSource.swift in Sources */,
+				B55BB4D4235012AE00C33E34 /* ObjectRepresentation.swift in Sources */,
 				B5ECDBFF1CA80CBA00C7F112 /* CSWhere.swift in Sources */,
 				B5ECDC051CA8138100C7F112 /* CSOrderBy.swift in Sources */,
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 				B5831B751F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
 				B51B5C2D22D43E38009FA3BA /* KeyPath+KeyPaths.swift in Sources */,
+				B50564D32350CC3100482308 /* PropertyProtocol.swift in Sources */,
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 				B5BF7FC1234D7B2E0070E741 /* LiveObject.swift in Sources */,
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 				B5D339F11E94AF5800C880DE /* CoreStoreStrings.swift in Sources */,
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-				B5F849712348A6690029D57B /* EnvironmentKeys.swift in Sources */,
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 				B5ECDC231CA81A3900C7F112 /* CSCoreStore+Querying.swift in Sources */,
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@@ -2187,6 +2215,7 @@
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 				B52F743D1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
 				B5E8A72021C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B53D9E5923513712000F48FB /* DiffableDataSourceSnapshotProtocol.swift in Sources */,
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 				B596BBBC1DD5C39F001DCDD9 /* QueryableSource.swift in Sources */,
 				B5ECDC011CA80CBA00C7F112 /* CSWhere.swift in Sources */,
+				B55BB4D5235012AE00C33E34 /* ObjectRepresentation.swift in Sources */,
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 				82BA18B31C4BBD3900A0916E /* ImportableUniqueObject.swift in Sources */,
 				B50EE14323473C96009B8C47 /* CoreStoreObject+DataSources.swift in Sources */,
+				B55BB4DA23503B9600C33E34 /* EnvironmentKeys.swift in Sources */,
 				B5E1B5951CAA0C15007FD580 /* CSObjectMonitor.swift in Sources */,
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 				82BA18C11C4BBD5300A0916E /* CoreStore+Observing.swift in Sources */,
+				B53D9E5A23513712000F48FB /* DiffableDataSourceSnapshotProtocol.swift in Sources */,
 				82BA18BC1C4BBD4A00A0916E /* OrderBy.swift in Sources */,
 				82BA18B01C4BBD3100A0916E /* NSManagedObject+Transaction.swift in Sources */,
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@@ -2375,7 +2408,6 @@
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-				B5F849722348A6690029D57B /* EnvironmentKeys.swift in Sources */,
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 				B58D0C641EAA0C7E003EDD87 /* NSManagedObject+DynamicModel.swift in Sources */,
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@@ -2483,6 +2515,7 @@
 				B5BF7FC4234D7B2E0070E741 /* LiveObject.swift in Sources */,
 				B596BBBE1DD5C39F001DCDD9 /* QueryableSource.swift in Sources */,
 				B546F9601C9A12B800D5AC55 /* CSSQliteStore.swift in Sources */,
+				B55BB4D7235012AE00C33E34 /* ObjectRepresentation.swift in Sources */,
 				B5ECDC0F1CA8161B00C7F112 /* CSGroupBy.swift in Sources */,
 				B5ECDC211CA81A2100C7F112 /* CSDataStack+Querying.swift in Sources */,
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 				B5E294E02349F8E7003E5956 /* SnapshotResult.swift in Sources */,
 				B52DD19E1BE1F92C00949AFE /* AsynchronousDataTransaction.swift in Sources */,
+				B50564D62350CC3100482308 /* PropertyProtocol.swift in Sources */,
 				B5831B781F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
 				B52DD1981BE1F92500949AFE /* CoreStore+Setup.swift in Sources */,
 				B5BF7FB5234C97910070E741 /* DiffableDataSource.swift in Sources */,
@@ -2514,6 +2548,7 @@
 				B509C7F71E54511B0061C547 /* ImportableAttributeType.swift in Sources */,
 				B5220E1F1D130810009BC71E /* CSListObserver.swift in Sources */,
 				B50EE14523473C97009B8C47 /* CoreStoreObject+DataSources.swift in Sources */,
+				B55BB4D823503B9500C33E34 /* EnvironmentKeys.swift in Sources */,
 				B52DD1941BE1F92500949AFE /* CoreStore.swift in Sources */,
 				18166889232B9ED80097C275 /* String+KeyPaths.swift in Sources */,
 				B52DD1A61BE1F92F00949AFE /* BaseDataTransaction+Importing.swift in Sources */,
@@ -2538,6 +2573,7 @@
 				B5FE4DAF1C85D44E00FA6A91 /* SQLiteStore.swift in Sources */,
 				B52DD1C71BE1F94600949AFE /* NSManagedObjectContext+Querying.swift in Sources */,
 				B52DD1C81BE1F94600949AFE /* NSManagedObjectContext+Setup.swift in Sources */,
+				B53D9E5C23513712000F48FB /* DiffableDataSourceSnapshotProtocol.swift in Sources */,
 				B52DD1C31BE1F94600949AFE /* Internals.NotificationObserver.swift in Sources */,
 				B52DD1A81BE1F93200949AFE /* DataStack+Querying.swift in Sources */,
 				B50132332346B76E00FC238B /* Internals.FetchedDiffableDataSourceSnapshotDelegate.swift in Sources */,
@@ -2591,7 +2627,6 @@
 				B56923CC1EB82410007C4DC9 /* NSManagedObjectModel+Migration.swift in Sources */,
 				B56923E71EB827F5007C4DC9 /* CustomSchemaMappingProvider.swift in Sources */,
 				B58D0C661EAA0C7E003EDD87 /* NSManagedObject+DynamicModel.swift in Sources */,
-				B5F849742348A6690029D57B /* EnvironmentKeys.swift in Sources */,
 				B533C4DE1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift in Sources */,
 				B5220E141D130614009BC71E /* DataStack+Observing.swift in Sources */,
 				B52DD1A21BE1F92C00949AFE /* CoreStore+Transaction.swift in Sources */,
@@ -2699,6 +2734,7 @@
 				B5BF7FC3234D7B2E0070E741 /* LiveObject.swift in Sources */,
 				B596BBBD1DD5C39F001DCDD9 /* QueryableSource.swift in Sources */,
 				B5ECDC081CA8138100C7F112 /* CSOrderBy.swift in Sources */,
+				B55BB4D6235012AE00C33E34 /* ObjectRepresentation.swift in Sources */,
 				B5E1B59B1CAA0C23007FD580 /* CSObjectObserver.swift in Sources */,
 				B5519A611CA21954002BEF78 /* CSAsynchronousDataTransaction.swift in Sources */,
 				B5FE4DAE1C85D44E00FA6A91 /* SQLiteStore.swift in Sources */,
@@ -2719,6 +2755,7 @@
 				B5BF7FCD234D80910070E741 /* Internals.LazyNonmutating.swift in Sources */,
 				B5E294DF2349F8E7003E5956 /* SnapshotResult.swift in Sources */,
 				B53FBA151CAB63CB00F0D40A /* Progress+ObjectiveC.swift in Sources */,
+				B50564D52350CC3100482308 /* PropertyProtocol.swift in Sources */,
 				B5E1B5AB1CAA49E2007FD580 /* CSDataStack+Migrating.swift in Sources */,
 				B5831B771F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
 				B5BF7FB4234C97910070E741 /* DiffableDataSource.swift in Sources */,
@@ -2730,6 +2767,7 @@
 				B509C7F61E54511B0061C547 /* ImportableAttributeType.swift in Sources */,
 				B5E1B5961CAA0C15007FD580 /* CSObjectMonitor.swift in Sources */,
 				B50EE14423473C97009B8C47 /* CoreStoreObject+DataSources.swift in Sources */,
+				B55BB4D923503B9600C33E34 /* EnvironmentKeys.swift in Sources */,
 				B5ECDC2C1CA81CC700C7F112 /* CSDataStack+Transaction.swift in Sources */,
 				18166888232B9ED70097C275 /* String+KeyPaths.swift in Sources */,
 				B56321911BD65216006C9394 /* BaseDataTransaction+Importing.swift in Sources */,
@@ -2754,6 +2792,7 @@
 				B5519A5B1CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
 				B5ECDBE21CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
 				B56321971BD65216006C9394 /* Select.swift in Sources */,
+				B53D9E5B23513712000F48FB /* DiffableDataSourceSnapshotProtocol.swift in Sources */,
 				B56321AB1BD6521C006C9394 /* Internals.FetchedResultsControllerDelegate.swift in Sources */,
 				B563219C1BD65216006C9394 /* SectionBy.swift in Sources */,
 				B50132322346B76E00FC238B /* Internals.FetchedDiffableDataSourceSnapshotDelegate.swift in Sources */,
@@ -2807,7 +2846,6 @@
 				B5215CA61FA47DFD00139E3A /* FetchChainBuilder.swift in Sources */,
 				B5D33A031E96012400C880DE /* Relationship.swift in Sources */,
 				B559CD4C1CAA8C6D00E4D58B /* CSStorageInterface.swift in Sources */,
-				B5F849732348A6690029D57B /* EnvironmentKeys.swift in Sources */,
 				B56923CB1EB82410007C4DC9 /* NSManagedObjectModel+Migration.swift in Sources */,
 				B56923E61EB827F5007C4DC9 /* CustomSchemaMappingProvider.swift in Sources */,
 				B58D0C651EAA0C7E003EDD87 /* NSManagedObject+DynamicModel.swift in Sources */,

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

@@ -41,18 +41,6 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-         <TestableReference
-            skipped = "NO">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "2F03A53A19C5C6DA005002A5"
-               BuildableName = "CoreStoreTests.xctest"
-               BlueprintName = "CoreStoreTests iOS"
-               ReferencedContainer = "container:CoreStore.xcodeproj">
-            </BuildableReference>
-         </TestableReference>
-      </Testables>
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
@@ -69,6 +57,18 @@
             isEnabled = "YES">
          </AdditionalOption>
       </AdditionalOptions>
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "2F03A53A19C5C6DA005002A5"
+               BuildableName = "CoreStoreTests.xctest"
+               BlueprintName = "CoreStoreTests iOS"
+               ReferencedContainer = "container:CoreStore.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -95,8 +95,6 @@
             isEnabled = "NO">
          </CommandLineArgument>
       </CommandLineArguments>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"

CoreStoreDemo/CoreStoreDemo.xcodeproj/project.pbxproj

@@ -288,6 +288,7 @@
 				TargetAttributes = {
 					B54AAD481AF4D26E00848AE0 = {
 						CreatedOnToolsVersion = 6.3;
+						DevelopmentTeam = 2JT32EJ5BH;
 						LastSwiftMigration = 0900;
 					};
 				};
@@ -493,6 +494,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				DEVELOPMENT_TEAM = 2JT32EJ5BH;
 				INFOPLIST_FILE = CoreStoreDemo/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.corestore.demo;
@@ -505,6 +507,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				DEVELOPMENT_TEAM = 2JT32EJ5BH;
 				INFOPLIST_FILE = CoreStoreDemo/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.corestore.demo;

CoreStoreDemo/CoreStoreDemo/SwiftUI Demo/SwiftUIContainerViewController.swift

@@ -13,7 +13,7 @@ import CoreStore
 import SwiftUI
 
 #endif
-
+import Compression
 final class SwiftUIContainerViewController: UIViewController {
     
     override func viewDidLoad() {

CoreStoreDemo/CoreStoreDemo/SwiftUI Demo/SwiftUIView.swift

@@ -60,25 +60,48 @@ struct SwiftUIView: View {
                     }
                 }
             }
-            .navigationBarTitle(Text("SwiftUI"))
+            .navigationBarTitle(Text("SwiftUI (\(palettes.numberOfItems) objects)"))
             .navigationBarItems(
                 leading: EditButton(),
-                trailing: Button(
+                trailing: HStack {
-                    action: {
+                    Button(
+                        action: {
 
-                        self.dataStack.perform(
+                            self.dataStack.perform(
-                            asynchronous: { transaction in
+                                asynchronous: { transaction in
 
-                                let palette = transaction.create(Into<Palette>())
+                                    for palette in try transaction.fetchAll(From<Palette>()) {
-                                palette.setInitialValues(in: transaction)
+
-                            },
+                                        palette.hue .= Palette.randomHue()
-                            completion: { _ in }
+                                        palette.colorName .= nil
-                        )
+                                    }
-                    },
+                                },
-                    label: {
+                                completion: { _ in }
-                        Image(systemName: "plus")
+                            )
-                    }
+                        },
-                )
+                        label: {
+                            Image(systemName: "goforward")
+                        }
+                    )
+                    .frame(width: 30)
+                    Button(
+                        action: {
+
+                            self.dataStack.perform(
+                                asynchronous: { transaction in
+
+                                    let palette = transaction.create(Into<Palette>())
+                                    palette.setInitialValues(in: transaction)
+                                },
+                                completion: { _ in }
+                            )
+                        },
+                        label: {
+                            Image(systemName: "plus")
+                        }
+                    )
+                    .frame(width: 30)
+                }
             )
             .alert(
                 isPresented: $needsShowAlert,

CoreStoreTests/DynamicModelTests.swift

@@ -164,24 +164,72 @@ class DynamicModelTests: BaseTestDataTestCase {
                     
                     animal.color .= .yellow
                     XCTAssertEqual(animal.color.value, Color.yellow)
+
+                    for property in Animal.metaProperties(includeSuperclasses: true) {
+
+                        switch property.keyPath {
+
+                        case String(keyPath: \Animal.species):
+                            XCTAssertTrue(property is ValueContainer<Animal>.Required<String>)
+
+                        case String(keyPath: \Animal.master):
+                            XCTAssertTrue(property is RelationshipContainer<Animal>.ToOne<Person>)
+
+                        case String(keyPath: \Animal.color):
+                            XCTAssertTrue(property is TransformableContainer<Animal>.Optional<Color>)
+
+                        default:
+                            XCTFail("Unknown KeyPath: \"\(property.keyPath)\"")
+                        }
+                    }
                     
                     let dog = transaction.create(Into<Dog>())
                     XCTAssertEqual(dog.species.value, "Swift")
                     XCTAssertEqual(dog.nickname.value, nil)
                     XCTAssertEqual(dog.age.value, 1)
 
-                    #if swift(>=5.1)
+                    for property in Dog.metaProperties(includeSuperclasses: true) {
 
-                    let dogKeyPathBuilder = Dog.keyPathBuilder()
+                        switch property.keyPath {
-                    XCTAssertEqual(dogKeyPathBuilder.species.keyPathString, "SELF.species")
-                    XCTAssertEqual(dogKeyPathBuilder.master.title.keyPathString, "SELF.master.title")
-                    let a = dogKeyPathBuilder.master
-                    let b = dogKeyPathBuilder.master.spouse
-                    let c = dogKeyPathBuilder.master.spouse.pets
-                    let d = dogKeyPathBuilder.master.spouse.pets.color
-                    XCTAssertEqual(dogKeyPathBuilder.master.spouse.pets.color.keyPathString, "SELF.master.spouse.pets.color")
 
-                    #endif
+                        case String(keyPath: \Dog.species):
+                            XCTAssertTrue(property is ValueContainer<Animal>.Required<String>)
+
+                        case String(keyPath: \Dog.master):
+                            XCTAssertTrue(property is RelationshipContainer<Animal>.ToOne<Person>)
+
+                        case String(keyPath: \Dog.color):
+                            XCTAssertTrue(property is TransformableContainer<Animal>.Optional<Color>)
+
+                        case String(keyPath: \Dog.nickname):
+                            XCTAssertTrue(property is ValueContainer<Dog>.Optional<String>)
+
+                        case String(keyPath: \Dog.age):
+                            XCTAssertTrue(property is ValueContainer<Dog>.Required<Int>)
+
+                        case String(keyPath: \Dog.friends):
+                            XCTAssertTrue(property is RelationshipContainer<Dog>.ToManyOrdered<Dog>)
+
+                        case String(keyPath: \Dog.friendedBy):
+                            XCTAssertTrue(property is RelationshipContainer<Dog>.ToManyUnordered<Dog>)
+
+                        default:
+                            XCTFail("Unknown KeyPath: \"\(property.keyPath)\"")
+                        }
+                    }
+
+//                    #if swift(>=5.1)
+//
+//                    let dogKeyPathBuilder = Dog.keyPathBuilder()
+//                    XCTAssertEqual(dogKeyPathBuilder.species.keyPathString, "SELF.species")
+//                    XCTAssertEqual(dogKeyPathBuilder.master.title.keyPathString, "SELF.master.title")
+//                    let a = dogKeyPathBuilder.master
+//                    let b = dogKeyPathBuilder.master.spouse
+//                    let c = dogKeyPathBuilder.master.spouse.pets
+//                    let d = dogKeyPathBuilder.master.spouse.pets.color
+//                    XCTAssertEqual(dogKeyPathBuilder.master.spouse.pets.color.keyPathString, "SELF.master.spouse.pets.color")
+//
+//                    #endif
 
                     let didSetObserver = dog.species.observe(options: [.new, .old]) { (object, change) in
 
@@ -244,22 +292,22 @@ class DynamicModelTests: BaseTestDataTestCase {
                     XCTAssertEqual(person.name.value, "John")
                     XCTAssertEqual(person.displayName.value, "Mr. John") // Custom getter
                     
-                    let personSnapshot1 = person.createSnapshot()
+//                    let personSnapshot1 = person.createSnapshot()
-                    XCTAssertEqual(person.name.value, personSnapshot1.name)
+//                    XCTAssertEqual(person.name.value, personSnapshot1.name)
-                    XCTAssertEqual(person.title.value, personSnapshot1.title)
+//                    XCTAssertEqual(person.title.value, personSnapshot1.title)
-                    XCTAssertEqual(person.displayName.value, personSnapshot1.displayName)
+//                    XCTAssertEqual(person.displayName.value, personSnapshot1.displayName)
                     
                     person.title .= "Sir"
                     XCTAssertEqual(person.displayName.value, "Sir John")
                     
-                    XCTAssertEqual(personSnapshot1.name, "John")
+//                    XCTAssertEqual(personSnapshot1.name, "John")
-                    XCTAssertEqual(personSnapshot1.title, "Mr.")
+//                    XCTAssertEqual(personSnapshot1.title, "Mr.")
-                    XCTAssertEqual(personSnapshot1.displayName, "Mr. John")
+//                    XCTAssertEqual(personSnapshot1.displayName, "Mr. John")
                     
-                    let personSnapshot2 = person.createSnapshot()
+//                    let personSnapshot2 = person.createSnapshot()
-                    XCTAssertEqual(person.name.value, personSnapshot2.name)
+//                    XCTAssertEqual(person.name.value, personSnapshot2.name)
-                    XCTAssertEqual(person.title.value, personSnapshot2.title)
+//                    XCTAssertEqual(person.title.value, personSnapshot2.title)
-                    XCTAssertEqual(person.displayName.value, personSnapshot2.displayName)
+//                    XCTAssertEqual(person.displayName.value, personSnapshot2.displayName)
                     
                     person.pets.value.insert(dog)
                     XCTAssertEqual(person.pets.count, 1)

CoreStoreTests/LiveListTests.swift

@@ -33,7 +33,7 @@ import CoreStore
 
 // MARK: - LiveListTests
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 class LiveListTests: BaseTestDataTestCase {
 
     @objc

Sources/AttributeProtocol.swift

@@ -29,11 +29,10 @@ import CoreData
 
 // MARK: - AttributeProtocol
 
-internal protocol AttributeProtocol: AnyObject {
+internal protocol AttributeProtocol: PropertyProtocol {
     
     static var attributeType: NSAttributeType { get }
     
-    var keyPath: KeyPathString { get }
     var isOptional: Bool { get }
     var isTransient: Bool { get }
     var allowsExternalBinaryDataStorage: Bool { get }

Sources/CoreStoreObject+DataSources.swift

@@ -13,7 +13,7 @@ import Combine
 
 // MARK: - LiveList: ObservableObject
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 extension CoreStoreObject: ObservableObject {
 
     // MARK: ObservableObject

Sources/CoreStoreObject.swift

@@ -116,6 +116,27 @@ open /*abstract*/ class CoreStoreObject: DynamicObject, Hashable {
     
     internal let rawObject: CoreStoreManagedObject?
     internal let isMeta: Bool
+
+    internal class func metaProperties(includeSuperclasses: Bool) -> [PropertyProtocol] {
+
+        func keyPaths(_ allKeyPaths: inout [PropertyProtocol], for dynamicType: CoreStoreObject.Type) {
+
+            allKeyPaths.append(contentsOf: dynamicType.meta.propertyProtocolsByName())
+            guard
+                includeSuperclasses,
+                case let superType as CoreStoreObject.Type = (dynamicType as AnyClass).superclass(),
+                superType != CoreStoreObject.self
+                else {
+
+                    return
+            }
+            keyPaths(&allKeyPaths, for: superType)
+        }
+
+        var allKeyPaths: [PropertyProtocol] = []
+        keyPaths(&allKeyPaths, for: self)
+        return allKeyPaths
+    }
     
     
     // MARK: Private
@@ -144,6 +165,22 @@ open /*abstract*/ class CoreStoreObject: DynamicObject, Hashable {
             }
         }
     }
+
+    private func propertyProtocolsByName() -> [PropertyProtocol] {
+
+        Internals.assert(self.isMeta, "'propertyProtocolsByName()' accessed from non-meta instance of \(Internals.typeName(self))")
+
+        let cacheKey = ObjectIdentifier(Self.self)
+        if let properties = Static.propertiesCache[cacheKey] {
+
+            return properties
+        }
+        let values: [PropertyProtocol] = Mirror(reflecting: self)
+            .children
+            .compactMap({ $0.value as? PropertyProtocol })
+        Static.propertiesCache[cacheKey] = values
+        return values
+    }
 }
 
 
@@ -187,4 +224,5 @@ fileprivate enum Static {
     // MARK: FilePrivate
     
     fileprivate static var metaCache: [ObjectIdentifier: Any] = [:]
+    fileprivate static var propertiesCache: [ObjectIdentifier: [PropertyProtocol]] = [:]
 }

Sources/CoreStoreSchema.swift

@@ -283,9 +283,9 @@ public final class CoreStoreSchema: DynamicSchema {
         func createProperties(for type: CoreStoreObject.Type) -> [NSPropertyDescription] {
             
             var propertyDescriptions: [NSPropertyDescription] = []
-            for child in Mirror(reflecting: type.meta).children {
+            for property in type.metaProperties(includeSuperclasses: false) {
                 
-                switch child.value {
+                switch property {
                     
                 case let attribute as AttributeProtocol:
                     Internals.assert(
@@ -378,9 +378,10 @@ public final class CoreStoreSchema: DynamicSchema {
         for (entity, entityDescription) in entityDescriptionsByEntity {
             
             let relationshipsByName = relationshipsByNameByEntity[entity]!
-            for child in Mirror(reflecting: (entity.type as! CoreStoreObject.Type).meta).children {
+            let entityType = entity.type as! CoreStoreObject.Type
+            for property in entityType.metaProperties(includeSuperclasses: false) {
                 
-                switch child.value {
+                switch property {
                     
                 case let relationship as RelationshipProtocol:
                     let (destinationType, destinationKeyPath) = relationship.inverse

Sources/DataStack+DataSources.swift

@@ -31,7 +31,7 @@ import CoreData
 
 // MARK: - DataStack
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 extension DataStack {
 
     public func liveList<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> LiveList<D> {

Sources/DiffableDataSource.TableView.swift

@@ -48,7 +48,7 @@ import CoreData
 //            self.tableView = tableView
 //            self.cellProvider = cellProvider
 //
-//            if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *) {
+//            if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
 //
 //                self.rawDataSource = UITableViewDiffableDataSource<String, D.ObjectID>(
 //                    tableView: tableView,
@@ -71,7 +71,7 @@ import CoreData
 //        public func apply(_ snapshot: ListSnapshot<ObjectType>, animatingDifferences: Bool = true) {
 //
 //            let dataSource = UITableViewDiffableDataSource<String, D>.
-//            if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *) {
+//            if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
 //
 //                self.rawDataSource! as! UITableViewDiffableDataSource<String, D>
 //
@@ -95,7 +95,7 @@ import CoreData
 //        private let cellProvider: (UITableView, IndexPath, ObjectType) -> UITableViewCell?
 //        private let rawDataSource: Any?
 //
-//        @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+//        @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 //        private var diffableDataSource: UITableViewDiffableDataSource<String, D.ObjectID> {
 //
 //            return self.rawDataSource! as! UITableViewDiffableDataSource<String, D.ObjectID>

Sources/DiffableDataSourceSnapshotProtocol.swift

@@ -0,0 +1,34 @@
+//
+//  DiffableDataSourceSnapshotProtocol.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 Foundation
+import CoreData
+
+
+// MARK: - DiffableDataSourceSnapshotProtocol
+
+internal protocol DiffableDataSourceSnapshotProtocol {
+
+}

Sources/DynamicObject.swift

@@ -74,10 +74,10 @@ extension DynamicObject {
 
     // MARK: Internal
     
-    internal static func keyPathBuilder() -> DynamicObjectMeta<Never, Self> {
+//    internal static func keyPathBuilder() -> DynamicObjectMeta<Never, Self> {
-
+//
-        return .init(keyPathString: "SELF")
+//        return .init(keyPathString: "SELF")
-    }
+//    }
     
     internal func runtimeType() -> Self.Type {
         

Sources/EnvironmentKeys.swift

@@ -2,8 +2,25 @@
 //  EnvironmentKeys.swift
 //  CoreStore
 //
-//  Created by John Rommel Estropia on 2019/10/05.
+//  Copyright © 2018 John Rommel Estropia
-//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+//  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.
 //
 
 #if canImport(SwiftUI)
@@ -13,7 +30,7 @@ import SwiftUI
 
 // MARK: - DataStackEnvironmentKey
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 public struct DataStackEnvironmentKey: EnvironmentKey {
 
     // MARK: Public
@@ -27,7 +44,7 @@ public struct DataStackEnvironmentKey: EnvironmentKey {
 
 // MARK: - EnvironmentValues
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 extension EnvironmentValues {
 
     // MARK: Public

Sources/Internals.DiffableDataSourceSnapshot.swift

@@ -48,18 +48,14 @@ extension Internals {
 
         // MARK: Internal
 
-        internal let nextStateTag: UUID
-
         init() {
 
             self.structure = .init()
-            self.nextStateTag = .init()
         }
 
-        init(sections: [NSFetchedResultsSectionInfo], previousStateTag: UUID, nextStateTag: UUID) {
+        init(sections: [NSFetchedResultsSectionInfo]) {
 
-            self.structure = .init(sections: sections, previousStateTag: previousStateTag)
+            self.structure = .init(sections: sections)
-            self.nextStateTag = nextStateTag
         }
 
         var numberOfItems: Int {
@@ -77,21 +73,11 @@ extension Internals {
             return self.structure.allSectionIDs
         }
 
-        var allSectionStateIDs: [SectionStateID] {
-
-            return self.structure.allSectionStateIDs
-        }
-
         var allItemIDs: [NSManagedObjectID] {
 
             return self.structure.allItemIDs
         }
 
-        var allItemStateIDs: [ItemStateID] {
-
-            return self.structure.allItemStateIDs
-        }
-
         func numberOfItems(inSection identifier: String) -> Int {
 
             return self.itemIDs(inSection: identifier).count
@@ -102,21 +88,11 @@ extension Internals {
             return self.structure.items(in: identifier)
         }
 
-        func itemStateIDs(inSection identifier: String) -> [ItemStateID] {
-
-            return self.structure.itemStateIDs(in: identifier)
-        }
-
         func sectionIDs(containingItem identifier: NSManagedObjectID) -> String? {
 
             return self.structure.section(containing: identifier)
         }
 
-        func sectionStateIDs(containingItem identifier: NSManagedObjectID) -> SectionStateID? {
-
-            return self.structure.sectionStateID(containing: identifier)
-        }
-
         func indexOfItemID(_ identifier: NSManagedObjectID) -> Int? {
 
             return self.structure.allItemIDs.firstIndex(of: identifier)
@@ -127,24 +103,19 @@ extension Internals {
             return self.structure.allSectionIDs.firstIndex(of: identifier)
         }
 
-        func itemIDs(where stateCondition: @escaping (UUID) -> Bool) -> [NSManagedObjectID] {
+        mutating func appendItems(_ identifiers: [NSManagedObjectID], toSection sectionIdentifier: String?) {
 
-            return self.structure.itemsIDs(where: stateCondition)
+            self.structure.append(itemIDs: identifiers, to: sectionIdentifier)
         }
 
-        mutating func appendItems(_ identifiers: [NSManagedObjectID], toSection sectionIdentifier: String?, nextStateTag: UUID) {
+        mutating func insertItems(_ identifiers: [NSManagedObjectID], beforeItem beforeIdentifier: NSManagedObjectID) {
 
-            self.structure.append(itemIDs: identifiers, to: sectionIdentifier, nextStateTag: nextStateTag)
+            self.structure.insert(itemIDs: identifiers, before: beforeIdentifier)
         }
 
-        mutating func insertItems(_ identifiers: [NSManagedObjectID], beforeItem beforeIdentifier: NSManagedObjectID, nextStateTag: UUID) {
+        mutating func insertItems(_ identifiers: [NSManagedObjectID], afterItem afterIdentifier: NSManagedObjectID) {
 
-            self.structure.insert(itemIDs: identifiers, before: beforeIdentifier, nextStateTag: nextStateTag)
+            self.structure.insert(itemIDs: identifiers, after: afterIdentifier)
-        }
-
-        mutating func insertItems(_ identifiers: [NSManagedObjectID], afterItem afterIdentifier: NSManagedObjectID, nextStateTag: UUID) {
-
-            self.structure.insert(itemIDs: identifiers, after: afterIdentifier, nextStateTag: nextStateTag)
         }
 
         mutating func deleteItems(_ identifiers: [NSManagedObjectID]) {
@@ -172,19 +143,19 @@ extension Internals {
             self.structure.update(itemIDs: identifiers, nextStateTag: nextStateTag)
         }
 
-        mutating func appendSections(_ identifiers: [String], nextStateTag: UUID) {
+        mutating func appendSections(_ identifiers: [String]) {
 
-            self.structure.append(sectionIDs: identifiers, nextStateTag: nextStateTag)
+            self.structure.append(sectionIDs: identifiers)
         }
 
-        mutating func insertSections(_ identifiers: [String], beforeSection toIdentifier: String, nextStateTag: UUID) {
+        mutating func insertSections(_ identifiers: [String], beforeSection toIdentifier: String) {
 
-            self.structure.insert(sectionIDs: identifiers, before: toIdentifier, nextStateTag: nextStateTag)
+            self.structure.insert(sectionIDs: identifiers, before: toIdentifier)
         }
 
-        mutating func insertSections(_ identifiers: [String], afterSection toIdentifier: String, nextStateTag: UUID) {
+        mutating func insertSections(_ identifiers: [String], afterSection toIdentifier: String) {
 
-            self.structure.insert(sectionIDs: identifiers, after: toIdentifier, nextStateTag: nextStateTag)
+            self.structure.insert(sectionIDs: identifiers, after: toIdentifier)
         }
 
         mutating func deleteSections(_ identifiers: [String]) {
@@ -271,7 +242,7 @@ extension Internals {
                 self.sections = []
             }
 
-            init(sections: [NSFetchedResultsSectionInfo], previousStateTag: UUID) {
+            init(sections: [NSFetchedResultsSectionInfo]) {
 
                 self.sections = sections.map {
 
@@ -279,8 +250,7 @@ extension Internals {
                         id: $0.name,
                         items: $0.objects?
                             .compactMap({ ($0 as? NSManagedObject)?.objectID })
-                            .map({ Item(id: $0, stateTag: previousStateTag) }) ?? [],
+                            .map({ Item(id: $0) }) ?? []
-                        stateTag: previousStateTag
                     )
                 }
             }
@@ -290,21 +260,11 @@ extension Internals {
                 return self.sections.map({ $0.id })
             }
 
-            var allSectionStateIDs: [SectionStateID] {
-
-                return self.sections.map({ $0.stateID })
-            }
-
             var allItemIDs: [NSManagedObjectID] {
 
                 return self.sections.lazy.flatMap({ $0.elements }).map({ $0.id })
             }
 
-            var allItemStateIDs: [ItemStateID] {
-
-                return self.sections.lazy.flatMap({ $0.elements }).map({ $0.stateID })
-            }
-
             func items(in sectionID: String) -> [NSManagedObjectID] {
 
                 guard let sectionIndex = self.sectionIndex(of: sectionID) else {
@@ -314,33 +274,12 @@ extension Internals {
                 return self.sections[sectionIndex].elements.map({ $0.id })
             }
 
-            func itemsIDs(where stateCondition: @escaping (UUID) -> Bool) -> [NSManagedObjectID] {
-
-                return self.sections.lazy
-                    .flatMap({ $0.elements.filter({ stateCondition($0.stateTag) }) })
-                    .map({ $0.id })
-            }
-
-            func itemStateIDs(in sectionID: String) -> [ItemStateID] {
-
-                guard let sectionIndex = self.sectionIndex(of: sectionID) else {
-
-                    Internals.abort("Section \"\(sectionID)\" does not exist")
-                }
-                return self.sections[sectionIndex].elements.map({ $0.stateID })
-            }
-
             func section(containing itemID: NSManagedObjectID) -> String? {
 
                 return self.itemPositionMap()[itemID]?.section.id
             }
 
-            func sectionStateID(containing itemID: NSManagedObjectID) -> SectionStateID? {
+            mutating func append(itemIDs: [NSManagedObjectID], to sectionID: String?) {
-
-                return self.itemPositionMap()[itemID]?.section.stateID
-            }
-
-            mutating func append(itemIDs: [NSManagedObjectID], to sectionID: String?, nextStateTag: UUID) {
 
                 let index: Array<Section>.Index
                 if let sectionID = sectionID {
@@ -360,22 +299,22 @@ extension Internals {
                     }
                     index = section.index(before: section.endIndex)
                 }
-                let items = itemIDs.lazy.map({ Item(id: $0, stateTag: nextStateTag) })
+                let items = itemIDs.lazy.map({ Item(id: $0) })
                 self.sections[index].elements.append(contentsOf: items)
             }
 
-            mutating func insert(itemIDs: [NSManagedObjectID], before beforeItemID: NSManagedObjectID, nextStateTag: UUID) {
+            mutating func insert(itemIDs: [NSManagedObjectID], before beforeItemID: NSManagedObjectID) {
 
                 guard let itemPosition = self.itemPositionMap()[beforeItemID] else {
 
                     Internals.abort("Item \(beforeItemID) does not exist")
                 }
-                let items = itemIDs.lazy.map({ Item(id: $0, stateTag: nextStateTag) })
+                let items = itemIDs.lazy.map({ Item(id: $0) })
                 self.sections[itemPosition.sectionIndex].elements
                     .insert(contentsOf: items, at: itemPosition.itemRelativeIndex)
             }
 
-            mutating func insert(itemIDs: [NSManagedObjectID], after afterItemID: NSManagedObjectID, nextStateTag: UUID) {
+            mutating func insert(itemIDs: [NSManagedObjectID], after afterItemID: NSManagedObjectID) {
 
                 guard let itemPosition = self.itemPositionMap()[afterItemID] else {
 
@@ -383,7 +322,7 @@ extension Internals {
                 }
                 let itemIndex = self.sections[itemPosition.sectionIndex].elements
                     .index(after: itemPosition.itemRelativeIndex)
-                let items = itemIDs.lazy.map({ Item(id: $0, stateTag: nextStateTag) })
+                let items = itemIDs.lazy.map({ Item(id: $0) })
                 self.sections[itemPosition.sectionIndex].elements
                     .insert(contentsOf: items, at: itemIndex)
             }
@@ -459,34 +398,34 @@ extension Internals {
                         continue
                     }
                     self.sections[itemPosition.sectionIndex]
-                        .elements[itemPosition.itemRelativeIndex].stateTag = nextStateTag
+                        .elements[itemPosition.itemRelativeIndex].isReloaded = true
                 }
             }
 
-            mutating func append(sectionIDs: [String], nextStateTag: UUID) {
+            mutating func append(sectionIDs: [String]) {
 
-                let newSections = sectionIDs.lazy.map({ Section(id: $0, stateTag: nextStateTag) })
+                let newSections = sectionIDs.lazy.map({ Section(id: $0) })
                 self.sections.append(contentsOf: newSections)
             }
 
-            mutating func insert(sectionIDs: [String], before beforeSectionID: String, nextStateTag: UUID) {
+            mutating func insert(sectionIDs: [String], before beforeSectionID: String) {
 
                 guard let sectionIndex = self.sectionIndex(of: beforeSectionID) else {
 
                     Internals.abort("Section \"\(beforeSectionID)\" does not exist")
                 }
-                let newSections = sectionIDs.lazy.map({ Section(id: $0, stateTag: nextStateTag) })
+                let newSections = sectionIDs.lazy.map({ Section(id: $0) })
                 self.sections.insert(contentsOf: newSections, at: sectionIndex)
             }
 
-            mutating func insert(sectionIDs: [String], after afterSectionID: String, nextStateTag: UUID) {
+            mutating func insert(sectionIDs: [String], after afterSectionID: String) {
 
                 guard let beforeIndex = self.sectionIndex(of: afterSectionID) else {
 
                     Internals.abort("Section \"\(afterSectionID)\" does not exist")
                 }
                 let sectionIndex = self.sections.index(after: beforeIndex)
-                let newSections = sectionIDs.lazy.map({ Section(id: $0, stateTag: nextStateTag) })
+                let newSections = sectionIDs.lazy.map({ Section(id: $0) })
                 self.sections.insert(contentsOf: newSections, at: sectionIndex)
             }
 
@@ -533,7 +472,7 @@ extension Internals {
 
                         continue
                     }
-                    self.sections[sectionIndex].stateTag = nextStateTag
+                    self.sections[sectionIndex].isReloaded = true
                 }
             }
 
@@ -589,22 +528,17 @@ extension Internals {
 
             fileprivate struct Item: Identifiable, Equatable {
 
-                var stateTag: UUID
+                var isReloaded: Bool
 
-                init(id: NSManagedObjectID, stateTag: UUID) {
+                init(id: NSManagedObjectID, isReloaded: Bool = false) {
 
                     self.id = id
-                    self.stateTag = stateTag
+                    self.isReloaded = isReloaded
-                }
-
-                var stateID: ItemStateID {
-
-                    return .init(id: self.id, stateTag: self.stateTag)
                 }
 
                 func isContentEqual(to source: Item) -> Bool {
 
-                    return self.id == source.id && self.stateTag == source.stateTag
+                    return !self.isReloaded && self.id == source.id
                 }
 
                 // MARK: Identifiable
@@ -618,27 +552,22 @@ extension Internals {
             fileprivate struct Section: Identifiable, Equatable {
 
                 var elements: [Item] = []
-                var stateTag: UUID
+                var isReloaded: Bool
 
-                init(id: String, items: [Item] = [], stateTag: UUID) {
+                init(id: String, items: [Item] = [], isReloaded: Bool = false) {
                     self.id = id
                     self.elements = items
-                    self.stateTag = stateTag
+                    self.isReloaded = isReloaded
                 }
 
                 init<S: Sequence>(source: Section, elements: S) where S.Element == Item {
 
-                    self.init(id: source.id, items: Array(elements), stateTag: source.stateTag)
+                    self.init(id: source.id, items: Array(elements), isReloaded: source.isReloaded)
-                }
-
-                var stateID: SectionStateID {
-
-                    return .init(id: self.id, stateTag: self.stateTag)
                 }
 
                 func isContentEqual(to source: Section) -> Bool {
 
-                    return self.id == source.id && self.stateTag == source.stateTag
+                    return !self.isReloaded && self.id == source.id
                 }
 
                 // MARK: Identifiable

Sources/Internals.FetchedDiffableDataSourceSnapshotDelegate.swift

@@ -77,7 +77,7 @@ extension Internals {
 
 //            #if canImport(UIKit) || canImport(AppKit)
 //
-//            if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *) {
+//            if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
 //
 //                return
 //            }
@@ -96,7 +96,7 @@ extension Internals {
 
 //        #if canImport(UIKit) || canImport(AppKit)
 //
-//        @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+//        @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 //        @objc
 //        dynamic func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference) {
 //
@@ -111,48 +111,12 @@ extension Internals {
         @objc
         dynamic func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
 
-            let nextStateTag: UUID = .init()
-            var dataSourceSnapshot = Internals.DiffableDataSourceSnapshot(
-                sections: controller.sections ?? [],
-                previousStateTag: self.previousStateTag,
-                nextStateTag: nextStateTag
-            )
-            dataSourceSnapshot.reloadItems(self.reloadedItemIDs, nextStateTag: nextStateTag)
-            dataSourceSnapshot.reloadSections(self.reloadedSectionIDs, nextStateTag: nextStateTag)
-
             self.handler?.controller(
                 controller,
-                didChangContentWith: dataSourceSnapshot
+                didChangContentWith: Internals.DiffableDataSourceSnapshot(
+                    sections: controller.sections ?? []
+                )
             )
-            self.previousStateTag = nextStateTag
         }
-
-        @objc
-        dynamic func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
-
-            let managedObject = anObject as! NSManagedObject
-            self.reloadedItemIDs.insert(managedObject.objectID)
-        }
-
-        @objc
-        dynamic func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) {
-
-            self.reloadedSectionIDs.insert(sectionInfo.name)
-        }
-
-
-        // MARK: Private
-
-        private var previousStateTag: UUID = .init() {
-
-            didSet {
-
-                self.reloadedItemIDs = []
-                self.reloadedSectionIDs = []
-            }
-        }
-
-        private var reloadedItemIDs: Set<NSManagedObjectID> = []
-        private var reloadedSectionIDs: Set<String> = []
     }
 }

Sources/ListSnapshot.swift

@@ -128,17 +128,17 @@ public struct ListSnapshot<O: DynamicObject>: SnapshotResult, RandomAccessCollec
 
     public mutating func appendItems(_ identifiers: [ItemID], toSection sectionIdentifier: SectionID? = nil) {
 
-        self.diffableSnapshot.appendItems(identifiers, toSection: sectionIdentifier, nextStateTag: .init())
+        self.diffableSnapshot.appendItems(identifiers, toSection: sectionIdentifier)
     }
 
     public mutating func insertItems(_ identifiers: [ItemID], beforeItem beforeIdentifier: ItemID) {
 
-        self.diffableSnapshot.insertItems(identifiers, beforeItem: beforeIdentifier, nextStateTag: .init())
+        self.diffableSnapshot.insertItems(identifiers, beforeItem: beforeIdentifier)
     }
 
     public mutating func insertItems(_ identifiers: [ItemID], afterItem afterIdentifier: ItemID) {
 
-        self.diffableSnapshot.insertItems(identifiers, afterItem: afterIdentifier, nextStateTag: .init())
+        self.diffableSnapshot.insertItems(identifiers, afterItem: afterIdentifier)
     }
 
     public mutating func deleteItems(_ identifiers: [ItemID]) {
@@ -168,17 +168,17 @@ public struct ListSnapshot<O: DynamicObject>: SnapshotResult, RandomAccessCollec
 
     public mutating func appendSections(_ identifiers: [SectionID]) {
 
-        self.diffableSnapshot.appendSections(identifiers, nextStateTag: .init())
+        self.diffableSnapshot.appendSections(identifiers)
     }
 
     public mutating func insertSections(_ identifiers: [SectionID], beforeSection toIdentifier: SectionID) {
 
-        self.diffableSnapshot.insertSections(identifiers, beforeSection: toIdentifier, nextStateTag: .init())
+        self.diffableSnapshot.insertSections(identifiers, beforeSection: toIdentifier)
     }
 
     public mutating func insertSections(_ identifiers: [SectionID], afterSection toIdentifier: SectionID) {
 
-        self.diffableSnapshot.insertSections(identifiers, afterSection: toIdentifier, nextStateTag: .init())
+        self.diffableSnapshot.insertSections(identifiers, afterSection: toIdentifier)
     }
 
     public mutating func deleteSections(_ identifiers: [SectionID]) {
@@ -263,16 +263,6 @@ public struct ListSnapshot<O: DynamicObject>: SnapshotResult, RandomAccessCollec
         self.diffableSnapshot = diffableSnapshot
         self.context = context
     }
-
-    internal var nextStateTag: UUID {
-
-        return self.diffableSnapshot.nextStateTag
-    }
-
-    internal func itemIDs(where stateCondition: @escaping (UUID) -> Bool) -> [ItemID] {
-
-        return self.diffableSnapshot.itemIDs(where: stateCondition)
-    }
     
     
     // MARK: Private

Sources/LiveList.swift

@@ -49,10 +49,7 @@ public final class LiveList<O: DynamicObject>: Hashable {
 
         willSet {
 
-            if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *) {
+            self.willChange()
-
-                self.willChange()
-            }
         }
     }
 
@@ -267,7 +264,7 @@ public final class LiveList<O: DynamicObject>: Hashable {
             applyFetchClauses: applyFetchClauses
         )
 
-        if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *) {
+        if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
 
             #if canImport(Combine)
             self.rawObjectWillChange = ObservableObjectPublisher()
@@ -318,20 +315,33 @@ extension LiveList: FetchedDiffableDataSourceSnapshotHandler {
 #if canImport(Combine)
 import Combine
 
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
+extension LiveList: ObservableObject {}
+
+#endif
+
 // MARK: - LiveList: LiveResult
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
 extension LiveList: LiveResult {
 
     // MARK: ObservableObject
 
+    #if canImport(Combine)
+
+    @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
     public var objectWillChange: ObservableObjectPublisher {
 
         return self.rawObjectWillChange! as! ObservableObjectPublisher
     }
 
+    #endif
+
     public func willChange() {
 
+        guard #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) else {
+
+            return
+        }
         #if canImport(Combine)
 
         #if canImport(SwiftUI)
@@ -340,11 +350,10 @@ extension LiveList: LiveResult {
             self.objectWillChange.send()
         }
 
-        #else
-        self.objectWillChange.send()
-
         #endif
 
+        self.objectWillChange.send()
+
         #endif
     }
 
@@ -353,5 +362,3 @@ extension LiveList: LiveResult {
         // TODO:
     }
 }
-
-#endif

Sources/LiveObject.swift

@@ -100,7 +100,7 @@ public final class LiveObject<O: DynamicObject>: Identifiable, Hashable {
 
         self.id = id
         self.context = context
-        if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *) {
+        if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
 
             #if canImport(Combine)
             self.rawObjectWillChange = ObservableObjectPublisher()
@@ -132,10 +132,7 @@ public final class LiveObject<O: DynamicObject>: Identifiable, Hashable {
                         return
                 }
                 self.$lazySnapshot.reset({ initializer(id, context) })
-                if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *) {
+                self.willChange()
-
-                    self.willChange()
-                }
             }
         )
 
@@ -156,20 +153,33 @@ public final class LiveObject<O: DynamicObject>: Identifiable, Hashable {
 #if canImport(Combine)
 import Combine
 
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
+extension LiveObject: ObservableObject {}
+
+#endif
+
 // MARK: - LiveObject: LiveResult
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
 extension LiveObject: LiveResult {
 
     // MARK: ObservableObject
 
+    #if canImport(Combine)
+
+    @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
     public var objectWillChange: ObservableObjectPublisher {
 
         return self.rawObjectWillChange! as! ObservableObjectPublisher
     }
+    
+    #endif
 
     public func willChange() {
 
+        guard #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) else {
+
+            return
+        }
         #if canImport(Combine)
 
         #if canImport(SwiftUI)
@@ -178,11 +188,10 @@ extension LiveObject: LiveResult {
             self.objectWillChange.send()
         }
 
-        #else
-        self.objectWillChange.send()
-
         #endif
 
+        self.objectWillChange.send()
+
         #endif
     }
 
@@ -192,8 +201,6 @@ extension LiveObject: LiveResult {
     }
 }
 
-#endif
-
 
 // MARK: - LiveObject where O: NSManagedObject
 

Sources/LiveQuery.swift

@@ -31,7 +31,7 @@
 //
 //
 //#warning("TODO: autoupdating doesn't work yet")
-//@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+//@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 //@propertyWrapper
 //public struct LiveQuery<Result: LiveResult>: DynamicProperty {
 //    
@@ -143,7 +143,7 @@
 //
 //#if canImport(UIKit) || canImport(AppKit)
 //
-//@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+//@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
 //extension LiveQuery {
 //
 //    public init<D: DynamicObject>(liveList: LiveList<D>) where Result == LiveList<D> {

Sources/LiveResult.swift

@@ -36,8 +36,7 @@ import AppKit
 
 // MARK: - LiveResult
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+public protocol LiveResult: AnyObject {
-public protocol LiveResult: ObservableObject {
     
     associatedtype ObjectType
     associatedtype SnapshotType: SnapshotResult where SnapshotType.ObjectType == Self.ObjectType

Sources/ObjectRepresentation.swift

@@ -0,0 +1,9 @@
+//
+//  ObjectRepresentation.swift
+//  CoreStore
+//
+//  Created by John Estropia on 2019/10/11.
+//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation

Sources/PropertyProtocol.swift

@@ -0,0 +1,35 @@
+//
+//  PropertyProtocol.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 Foundation
+import CoreData
+
+
+// MARK: - PropertyProtocol
+
+internal protocol PropertyProtocol: AnyObject {
+
+    var keyPath: KeyPathString { get }
+}

Sources/Relationship.swift

@@ -249,11 +249,15 @@ public enum RelationshipContainer<O: CoreStoreObject> {
         // MARK: RelationshipKeyPathStringConvertible
 
         public typealias ReturnValueType = DestinationValueType?
+
+
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
         
         
         // MARK: RelationshipProtocol
-        
+
-        internal let keyPath: KeyPathString
         internal let isToMany = false
         internal let isOrdered = false
         internal let deleteRule: NSDeleteRule
@@ -540,11 +544,15 @@ public enum RelationshipContainer<O: CoreStoreObject> {
         // MARK: RelationshipKeyPathStringConvertible
 
         public typealias ReturnValueType = [DestinationValueType]
+
+
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
         
         
         // MARK: RelationshipProtocol
-        
+
-        internal let keyPath: KeyPathString
         internal let isToMany = true
         internal let isOptional = true
         internal let isOrdered = true
@@ -837,11 +845,15 @@ public enum RelationshipContainer<O: CoreStoreObject> {
         // MARK: RelationshipKeyPathStringConvertible
 
         public typealias ReturnValueType = Set<DestinationValueType>
+
+
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
         
         
         // MARK: RelationshipProtocol
         
-        internal let keyPath: KeyPathString
         internal let isToMany = true
         internal let isOptional = true
         internal let isOrdered = false

Sources/RelationshipProtocol.swift

@@ -29,9 +29,8 @@ import CoreData
 
 // MARK: - RelationshipProtocol
 
-internal protocol RelationshipProtocol: AnyObject {
+internal protocol RelationshipProtocol: PropertyProtocol {
-    
+
-    var keyPath: KeyPathString { get }
     var isToMany: Bool { get }
     var isOrdered: Bool { get }
     var deleteRule: NSDeleteRule { get }

Sources/SnapshotResult.swift

@@ -36,7 +36,6 @@ import AppKit
 
 // MARK: - SnapshotResult
 
-@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
 public protocol SnapshotResult {
     
     associatedtype ObjectType: DynamicObject

Sources/Transformable.swift

@@ -209,6 +209,11 @@ public enum TransformableContainer<O: CoreStoreObject> {
         public typealias ReturnValueType = DestinationValueType
 
 
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
+
+
         // MARK: AttributeProtocol
         
         internal static var attributeType: NSAttributeType {
@@ -216,7 +221,6 @@ public enum TransformableContainer<O: CoreStoreObject> {
             return .transformableAttributeType
         }
 
-        internal let keyPath: KeyPathString
         internal let isOptional = false
         internal let isTransient: Bool
         internal let allowsExternalBinaryDataStorage: Bool
@@ -427,6 +431,11 @@ public enum TransformableContainer<O: CoreStoreObject> {
         public typealias ReturnValueType = DestinationValueType?
 
 
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
+
+
         // MARK: AttributeProtocol
 
         internal static var attributeType: NSAttributeType {
@@ -434,7 +443,6 @@ public enum TransformableContainer<O: CoreStoreObject> {
             return .transformableAttributeType
         }
 
-        internal let keyPath: KeyPathString
         internal let isOptional = true
         internal let isTransient: Bool
         internal let allowsExternalBinaryDataStorage: Bool

Sources/Value.swift

@@ -202,6 +202,11 @@ public enum ValueContainer<O: CoreStoreObject> {
         // MARK: AttributeKeyPathStringConvertible
 
         public typealias ReturnValueType = DestinationValueType
+
+
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
         
         
         // MARK: AttributeProtocol
@@ -210,8 +215,7 @@ public enum ValueContainer<O: CoreStoreObject> {
             
             return V.cs_rawAttributeType
         }
-        
+
-        internal let keyPath: KeyPathString
         internal let isOptional = false
         internal let isTransient: Bool
         internal let allowsExternalBinaryDataStorage = false
@@ -420,6 +424,11 @@ public enum ValueContainer<O: CoreStoreObject> {
         // MARK: AttributeKeyPathStringConvertible
 
         public typealias ReturnValueType = DestinationValueType?
+
+
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
         
         
         // MARK: AttributeProtocol
@@ -429,7 +438,6 @@ public enum ValueContainer<O: CoreStoreObject> {
             return V.cs_rawAttributeType
         }
         
-        internal let keyPath: KeyPathString
         internal let isOptional = true
         internal let isTransient: Bool
         internal let allowsExternalBinaryDataStorage = false