prototype new Fields as propertyWrappers (Swift 5.2 above only)

CoreStore.xcodeproj/project.pbxproj

@@ -322,7 +322,6 @@
 		B52FD3AB1E3B3EF10001D919 /* NSManagedObject+Logging.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52FD3A91E3B3EF10001D919 /* NSManagedObject+Logging.swift */; };
 		B52FD3AC1E3B3EF10001D919 /* NSManagedObject+Logging.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52FD3A91E3B3EF10001D919 /* NSManagedObject+Logging.swift */; };
 		B52FD3AD1E3B3EF10001D919 /* NSManagedObject+Logging.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52FD3A91E3B3EF10001D919 /* NSManagedObject+Logging.swift */; };
-		B53304AA230BA4F7007C2BD8 /* DynamicObjectMeta.swift in Sources */ = {isa = PBXBuildFile; fileRef = B53304A9230BA4F7007C2BD8 /* DynamicObjectMeta.swift */; };
 		B533C4DB1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B533C4DA1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift */; };
 		B533C4DC1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B533C4DA1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift */; };
 		B533C4DD1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B533C4DA1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift */; };
@@ -548,6 +547,34 @@
 		B56924021EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56923FE1EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift */; };
 		B56964D41B22FFAD0075EE4A /* DataStack+Migration.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56964D31B22FFAD0075EE4A /* DataStack+Migration.swift */; };
 		B56965241B356B820075EE4A /* MigrationResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56965231B356B820075EE4A /* MigrationResult.swift */; };
+		B56E4ECA23CD9B4800E1708C /* Field.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EC923CD9B4800E1708C /* Field.swift */; };
+		B56E4ECB23CD9B4800E1708C /* Field.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EC923CD9B4800E1708C /* Field.swift */; };
+		B56E4ECC23CD9B4800E1708C /* Field.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EC923CD9B4800E1708C /* Field.swift */; };
+		B56E4ECD23CD9B4800E1708C /* Field.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EC923CD9B4800E1708C /* Field.swift */; };
+		B56E4ECF23CD9E4200E1708C /* Field.Stored.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ECE23CD9E4200E1708C /* Field.Stored.swift */; };
+		B56E4ED023CD9E4200E1708C /* Field.Stored.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ECE23CD9E4200E1708C /* Field.Stored.swift */; };
+		B56E4ED123CD9E4200E1708C /* Field.Stored.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ECE23CD9E4200E1708C /* Field.Stored.swift */; };
+		B56E4ED223CD9E4200E1708C /* Field.Stored.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ECE23CD9E4200E1708C /* Field.Stored.swift */; };
+		B56E4ED423CDB54A00E1708C /* FieldProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ED323CDB54A00E1708C /* FieldProtocol.swift */; };
+		B56E4ED523CDB54A00E1708C /* FieldProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ED323CDB54A00E1708C /* FieldProtocol.swift */; };
+		B56E4ED623CDB54A00E1708C /* FieldProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ED323CDB54A00E1708C /* FieldProtocol.swift */; };
+		B56E4ED723CDB54A00E1708C /* FieldProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ED323CDB54A00E1708C /* FieldProtocol.swift */; };
+		B56E4ED923CEB8E700E1708C /* FieldStorableType.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ED823CEB8E700E1708C /* FieldStorableType.swift */; };
+		B56E4EDA23CEB8E700E1708C /* FieldStorableType.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ED823CEB8E700E1708C /* FieldStorableType.swift */; };
+		B56E4EDB23CEB8E700E1708C /* FieldStorableType.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ED823CEB8E700E1708C /* FieldStorableType.swift */; };
+		B56E4EDC23CEB8E700E1708C /* FieldStorableType.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4ED823CEB8E700E1708C /* FieldStorableType.swift */; };
+		B56E4EDF23CEBCF000E1708C /* FieldOptionalType.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EDE23CEBCF000E1708C /* FieldOptionalType.swift */; };
+		B56E4EE023CEBCF000E1708C /* FieldOptionalType.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EDE23CEBCF000E1708C /* FieldOptionalType.swift */; };
+		B56E4EE123CEBCF000E1708C /* FieldOptionalType.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EDE23CEBCF000E1708C /* FieldOptionalType.swift */; };
+		B56E4EE223CEBCF000E1708C /* FieldOptionalType.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EDE23CEBCF000E1708C /* FieldOptionalType.swift */; };
+		B56E4EE423CEDF0900E1708C /* Field.Computed.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EE323CEDF0900E1708C /* Field.Computed.swift */; };
+		B56E4EE523CEDF0900E1708C /* Field.Computed.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EE323CEDF0900E1708C /* Field.Computed.swift */; };
+		B56E4EE623CEDF0900E1708C /* Field.Computed.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EE323CEDF0900E1708C /* Field.Computed.swift */; };
+		B56E4EE723CEDF0900E1708C /* Field.Computed.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EE323CEDF0900E1708C /* Field.Computed.swift */; };
+		B56E4EE923CF0C4500E1708C /* Field.PlistCoded.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EE823CF0C4500E1708C /* Field.PlistCoded.swift */; };
+		B56E4EEA23CF0C4500E1708C /* Field.PlistCoded.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EE823CF0C4500E1708C /* Field.PlistCoded.swift */; };
+		B56E4EEB23CF0C4500E1708C /* Field.PlistCoded.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EE823CF0C4500E1708C /* Field.PlistCoded.swift */; };
+		B56E4EEC23CF0C4500E1708C /* Field.PlistCoded.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56E4EE823CF0C4500E1708C /* Field.PlistCoded.swift */; };
 		B57D27BE1D0BBE8200539C58 /* BaseTestDataTestCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = B57D27BD1D0BBE8200539C58 /* BaseTestDataTestCase.swift */; };
 		B57D27BF1D0BBE8200539C58 /* BaseTestDataTestCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = B57D27BD1D0BBE8200539C58 /* BaseTestDataTestCase.swift */; };
 		B57D27C01D0BBE8200539C58 /* BaseTestDataTestCase.swift in Sources */ = {isa = PBXBuildFile; fileRef = B57D27BD1D0BBE8200539C58 /* BaseTestDataTestCase.swift */; };
@@ -979,7 +1006,6 @@
 		B52F743C1E9B8724005F3DAC /* XcodeDataModelSchema.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = XcodeDataModelSchema.swift; sourceTree = "<group>"; };
 		B52F74491E9B8740005F3DAC /* CoreStoreSchema.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CoreStoreSchema.swift; sourceTree = "<group>"; };
 		B52FD3A91E3B3EF10001D919 /* NSManagedObject+Logging.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSManagedObject+Logging.swift"; sourceTree = "<group>"; };
-		B53304A9230BA4F7007C2BD8 /* DynamicObjectMeta.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DynamicObjectMeta.swift; sourceTree = "<group>"; };
 		B533C4DA1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "DispatchQueue+CoreStore.swift"; sourceTree = "<group>"; };
 		B538BA701D15B3E30003A766 /* CoreStoreBridge.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = CoreStoreBridge.m; sourceTree = "<group>"; };
 		B53B275E1EE3B92E00E9B352 /* CoreStoreManagedObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CoreStoreManagedObject.swift; sourceTree = "<group>"; };
@@ -1038,6 +1064,13 @@
 		B56923FE1EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSUnsafeDataModelSchema.swift; sourceTree = "<group>"; };
 		B56964D31B22FFAD0075EE4A /* DataStack+Migration.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; lineEnding = 0; path = "DataStack+Migration.swift"; sourceTree = "<group>"; };
 		B56965231B356B820075EE4A /* MigrationResult.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = MigrationResult.swift; sourceTree = "<group>"; };
+		B56E4EC923CD9B4800E1708C /* Field.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Field.swift; sourceTree = "<group>"; };
+		B56E4ECE23CD9E4200E1708C /* Field.Stored.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Field.Stored.swift; sourceTree = "<group>"; };
+		B56E4ED323CDB54A00E1708C /* FieldProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FieldProtocol.swift; sourceTree = "<group>"; };
+		B56E4ED823CEB8E700E1708C /* FieldStorableType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FieldStorableType.swift; sourceTree = "<group>"; };
+		B56E4EDE23CEBCF000E1708C /* FieldOptionalType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FieldOptionalType.swift; sourceTree = "<group>"; };
+		B56E4EE323CEDF0900E1708C /* Field.Computed.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Field.Computed.swift; sourceTree = "<group>"; };
+		B56E4EE823CF0C4500E1708C /* Field.PlistCoded.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Field.PlistCoded.swift; sourceTree = "<group>"; };
 		B57D27BD1D0BBE8200539C58 /* BaseTestDataTestCase.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = BaseTestDataTestCase.swift; sourceTree = "<group>"; };
 		B57D27C11D0BC20100539C58 /* QueryTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = QueryTests.swift; sourceTree = "<group>"; };
 		B58085741CDF7F00004C2EEB /* SetupTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SetupTests.swift; sourceTree = "<group>"; };
@@ -1386,6 +1419,7 @@
 			children = (
 				B5831B6F1F34AC3400A9F647 /* AttributeProtocol.swift */,
 				B5831B741F34AC7A00A9F647 /* RelationshipProtocol.swift */,
+				B56E4ED323CDB54A00E1708C /* FieldProtocol.swift */,
 				B50564D22350CC3100482308 /* PropertyProtocol.swift */,
 				B53D9E5823513712000F48FB /* DiffableDataSourceSnapshotProtocol.swift */,
 				B50E175623517DE4004F033C /* Differentiable.swift */,
@@ -1513,13 +1547,34 @@
 			name = Migrating;
 			sourceTree = "<group>";
 		};
+		B56E4EC823CD9B2E00E1708C /* Field Properties */ = {
+			isa = PBXGroup;
+			children = (
+				B56E4EC923CD9B4800E1708C /* Field.swift */,
+				B56E4ECE23CD9E4200E1708C /* Field.Stored.swift */,
+				B56E4EE323CEDF0900E1708C /* Field.Computed.swift */,
+				B56E4EE823CF0C4500E1708C /* Field.PlistCoded.swift */,
+				B56E4EDD23CEBB0400E1708C /* Supported Values */,
+			);
+			name = "Field Properties";
+			sourceTree = "<group>";
+		};
+		B56E4EDD23CEBB0400E1708C /* Supported Values */ = {
+			isa = PBXGroup;
+			children = (
+				B56E4EDE23CEBCF000E1708C /* FieldOptionalType.swift */,
+				B56E4ED823CEB8E700E1708C /* FieldStorableType.swift */,
+			);
+			name = "Supported Values";
+			sourceTree = "<group>";
+		};
 		B57358D71E5A7F9B0094B50A /* Dynamic Models */ = {
 			isa = PBXGroup;
 			children = (
 				B5D339D71E9489AB00C880DE /* CoreStoreObject.swift */,
-				B53304A9230BA4F7007C2BD8 /* DynamicObjectMeta.swift */,
 				B53CA9A11EF1EF1600E0F440 /* PartialObject.swift */,
-				B5831B6E1F3355C300A9F647 /* Properties */,
+				B56E4EC823CD9B2E00E1708C /* Field Properties */,
+				B5831B6E1F3355C300A9F647 /* Legacy Properties */,
 				B52F74391E9B8724005F3DAC /* Dynamic Schema */,
 				B5D339DC1E9489C700C880DE /* DynamicObject.swift */,
 				B52F742E1E9B50D0005F3DAC /* SchemaHistory.swift */,
@@ -1529,7 +1584,7 @@
 			name = "Dynamic Models";
 			sourceTree = "<group>";
 		};
-		B5831B6E1F3355C300A9F647 /* Properties */ = {
+		B5831B6E1F3355C300A9F647 /* Legacy Properties */ = {
 			isa = PBXGroup;
 			children = (
 				B5D33A001E96012400C880DE /* Relationship.swift */,
@@ -1543,7 +1598,7 @@
 				B509D7D223C84E1900F42824 /* Transformable.Required.swift */,
 				B509D7D723C84E2600F42824 /* Transformable.Optional.swift */,
 			);
-			name = Properties;
+			name = "Legacy Properties";
 			sourceTree = "<group>";
 		};
 		B5A1DAC61F111BBE003CF369 /* KeyPath Utilities */ = {
@@ -2145,6 +2200,7 @@
 			files = (
 				B5BF7FB7234C97CE0070E741 /* DiffableDataSource.TableViewAdapter-UIKit.swift in Sources */,
 				B5DE5230230BDA1300A22534 /* CoreStoreDefaults.swift in Sources */,
+				B56E4ED423CDB54A00E1708C /* FieldProtocol.swift in Sources */,
 				B509D7C423C848DA00F42824 /* Relationship.ToOne.swift in Sources */,
 				B5E84F221AFF84860064E85B /* ObjectMonitor.swift in Sources */,
 				B5ECDBF91CA804FD00C7F112 /* NSManagedObjectContext+ObjectiveC.swift in Sources */,
@@ -2194,6 +2250,7 @@
 				B5E1B5A81CAA49E2007FD580 /* CSDataStack+Migrating.swift in Sources */,
 				B50132302346B76E00FC238B /* Internals.FetchedDiffableDataSourceSnapshotDelegate.swift in Sources */,
 				B5D339F11E94AF5800C880DE /* CoreStoreStrings.swift in Sources */,
+				B56E4EE923CF0C4500E1708C /* Field.PlistCoded.swift in Sources */,
 				B56007161B4018AB00A9A8F9 /* MigrationChain.swift in Sources */,
 				B5E1B59D1CAA2568007FD580 /* CSDataStack+Observing.swift in Sources */,
 				B5ECDC231CA81A3900C7F112 /* CSCoreStore+Querying.swift in Sources */,
@@ -2213,10 +2270,12 @@
 				B50E175223517C6B004F033C /* Internals.DiffableDataUIDispatcher.Changeset.swift in Sources */,
 				B5E84EE71AFF84610064E85B /* CoreStore+Logging.swift in Sources */,
 				B546F9731C9C553300D5AC55 /* SetupResult.swift in Sources */,
+				B56E4EDF23CEBCF000E1708C /* FieldOptionalType.swift in Sources */,
 				B53CA9A21EF1EF1600E0F440 /* PartialObject.swift in Sources */,
 				B56007111B3F6BD500A9A8F9 /* Into.swift in Sources */,
 				B5E84F111AFF847B0064E85B /* Select.swift in Sources */,
 				B51260931E9B28F100402229 /* Internals.EntityIdentifier.swift in Sources */,
+				B56E4ECA23CD9B4800E1708C /* Field.swift in Sources */,
 				B5DAFB482203D9F8003FCCD0 /* Where.Expression.swift in Sources */,
 				B509D7D823C84E2600F42824 /* Transformable.Optional.swift in Sources */,
 				B5FE4DA21C8481E100FA6A91 /* StorageInterface.swift in Sources */,
@@ -2254,7 +2313,6 @@
 				B5E1B5A21CAA4365007FD580 /* CSCoreStore+Observing.swift in Sources */,
 				B5E84EDF1AFF84500064E85B /* DataStack.swift in Sources */,
 				B50E175723517DE4004F033C /* Differentiable.swift in Sources */,
-				B53304AA230BA4F7007C2BD8 /* DynamicObjectMeta.swift in Sources */,
 				B59AFF411C6593E400C0ABE2 /* NSPersistentStoreCoordinator+Setup.swift in Sources */,
 				B5E84F231AFF84860064E85B /* ListMonitor.swift in Sources */,
 				B5BF7FC6234D7E460070E741 /* ObjectSnapshot.swift in Sources */,
@@ -2271,9 +2329,11 @@
 				B5FAD6A91B50A4B400714891 /* Progress+Convenience.swift in Sources */,
 				B5E84EFC1AFF846E0064E85B /* SynchronousDataTransaction.swift in Sources */,
 				B5215CA91FA4810300139E3A /* QueryChainBuilder.swift in Sources */,
+				B56E4EE423CEDF0900E1708C /* Field.Computed.swift in Sources */,
 				B50E174D23517C03004F033C /* Internals.DiffableDataUIDispatcher.StagedChangeset.swift in Sources */,
 				B5E222231CA4E12600BA2E95 /* CSSynchronousDataTransaction.swift in Sources */,
 				B5E84F281AFF84920064E85B /* NSManagedObject+Convenience.swift in Sources */,
+				B56E4ECF23CD9E4200E1708C /* Field.Stored.swift in Sources */,
 				B52F744A1E9B8740005F3DAC /* CoreStoreSchema.swift in Sources */,
 				B5AEFAB51C9962AE00AD137F /* CoreStoreBridge.swift in Sources */,
 				B5E2222A1CA51B6E00BA2E95 /* CSUnsafeDataTransaction.swift in Sources */,
@@ -2314,6 +2374,7 @@
 				B52F743D1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
 				B5E8A72021C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
 				B53D9E5923513712000F48FB /* DiffableDataSourceSnapshotProtocol.swift in Sources */,
+				B56E4ED923CEB8E700E1708C /* FieldStorableType.swift in Sources */,
 				B5474D152227C08700B21FEC /* Internals.CoreStoreFetchRequest.swift in Sources */,
 				B56923FF1EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CAE1FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
@@ -2429,6 +2490,7 @@
 				B5ECDC251CA81A3900C7F112 /* CSCoreStore+Querying.swift in Sources */,
 				B549F6741E56A92800FBAB2D /* CoreDataNativeType.swift in Sources */,
 				B509C7F51E54511B0061C547 /* ImportableAttributeType.swift in Sources */,
+				B56E4EEA23CF0C4500E1708C /* Field.PlistCoded.swift in Sources */,
 				82BA18B31C4BBD3900A0916E /* ImportableUniqueObject.swift in Sources */,
 				B50EE14323473C96009B8C47 /* CoreStoreObject+DataSources.swift in Sources */,
 				B55BB4DA23503B9600C33E34 /* EnvironmentValues+DataSources.swift in Sources */,
@@ -2448,6 +2510,7 @@
 				B5831F432212700400D8604C /* Where.Expression.swift in Sources */,
 				B51260941E9B28F100402229 /* Internals.EntityIdentifier.swift in Sources */,
 				B5FE4DA81C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
+				B56E4EE023CEBCF000E1708C /* FieldOptionalType.swift in Sources */,
 				B5F8496D234898240029D57B /* ListSnapshot.swift in Sources */,
 				B53FBA001CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
 				B5DBE2D31C991B3E00B5CEFA /* CSDataStack.swift in Sources */,
@@ -2475,6 +2538,7 @@
 				B5D8CA772346EAEE0055D7D1 /* DataStack+DataSources.swift in Sources */,
 				82BA18D01C4BBD7100A0916E /* Internals.MigrationManager.swift in Sources */,
 				B5DE5231230BDA1300A22534 /* CoreStoreDefaults.swift in Sources */,
+				B56E4ED523CDB54A00E1708C /* FieldProtocol.swift in Sources */,
 				B52F74461E9B8724005F3DAC /* XcodeDataModelSchema.swift in Sources */,
 				82BA18C61C4BBD5900A0916E /* DataStack+Migration.swift in Sources */,
 				B59851491C90289D00C99590 /* NSPersistentStoreCoordinator+Setup.swift in Sources */,
@@ -2505,6 +2569,7 @@
 				B514EF0F23A8DB180093DBA4 /* DiffableDataSource.Target.swift in Sources */,
 				B52F744B1E9B8740005F3DAC /* CoreStoreSchema.swift in Sources */,
 				B5AEFAB61C9962AE00AD137F /* CoreStoreBridge.swift in Sources */,
+				B56E4EE523CEDF0900E1708C /* Field.Computed.swift in Sources */,
 				B5E2222C1CA51B6E00BA2E95 /* CSUnsafeDataTransaction.swift in Sources */,
 				82BA18A71C4BBD2900A0916E /* CoreStore+Logging.swift in Sources */,
 				B50E174E23517C03004F033C /* Internals.DiffableDataUIDispatcher.StagedChangeset.swift in Sources */,
@@ -2549,6 +2614,7 @@
 				B5474D162227C08700B21FEC /* Internals.CoreStoreFetchRequest.swift in Sources */,
 				B501322B2346A9AE00FC238B /* ListPublisher.swift in Sources */,
 				B56924001EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
+				B56E4EDA23CEB8E700E1708C /* FieldStorableType.swift in Sources */,
 				B5215CAF1FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				82BA18D61C4BBD7100A0916E /* NSManagedObjectContext+Transaction.swift in Sources */,
 				B56923ED1EB827F6007C4DC9 /* SchemaMappingProvider.swift in Sources */,
@@ -2564,8 +2630,10 @@
 				B5BF7FC7234D7E460070E741 /* ObjectSnapshot.swift in Sources */,
 				82BA18CC1C4BBD6400A0916E /* Progress+Convenience.swift in Sources */,
 				B5BF7FB8234C97CE0070E741 /* DiffableDataSource.TableViewAdapter-UIKit.swift in Sources */,
+				B56E4ED023CD9E4200E1708C /* Field.Stored.swift in Sources */,
 				82BA18C01C4BBD5300A0916E /* DataStack+Observing.swift in Sources */,
 				82BA18A61C4BBD2900A0916E /* DefaultLogger.swift in Sources */,
+				B56E4ECB23CD9B4800E1708C /* Field.swift in Sources */,
 				B509D7BE23C8480A00F42824 /* Value.Optional.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -2662,6 +2730,7 @@
 				B559CD471CAA8B6300E4D58B /* CSSetupResult.swift in Sources */,
 				B50E17642351FA66004F033C /* Internals.Closure.swift in Sources */,
 				B5ECDBF01CA6BF2000C7F112 /* CSFrom.swift in Sources */,
+				B56E4EEC23CF0C4500E1708C /* Field.PlistCoded.swift in Sources */,
 				B549F6761E56A92800FBAB2D /* CoreDataNativeType.swift in Sources */,
 				B509C7F71E54511B0061C547 /* ImportableAttributeType.swift in Sources */,
 				B5220E1F1D130810009BC71E /* CSListObserver.swift in Sources */,
@@ -2681,6 +2750,7 @@
 				B52DD1BD1BE1F94300949AFE /* NSManagedObject+Convenience.swift in Sources */,
 				B5831F4222126FED00D8604C /* KeyPathGenericBindings.swift in Sources */,
 				B53CA9A51EF1EF1600E0F440 /* PartialObject.swift in Sources */,
+				B56E4EE223CEBCF000E1708C /* FieldOptionalType.swift in Sources */,
 				B52DD1AD1BE1F93900949AFE /* Where.swift in Sources */,
 				B53FBA1C1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				B5F8496F234898240029D57B /* ListSnapshot.swift in Sources */,
@@ -2708,6 +2778,7 @@
 				B52DD1B81BE1F94000949AFE /* DataStack+Migration.swift in Sources */,
 				B5ECDC091CA8138100C7F112 /* CSOrderBy.swift in Sources */,
 				B5D8CA792346EAEF0055D7D1 /* DataStack+DataSources.swift in Sources */,
+				B56E4ED723CDB54A00E1708C /* FieldProtocol.swift in Sources */,
 				B56923C71EB823B4007C4DC9 /* NSEntityDescription+Migration.swift in Sources */,
 				B5DE5233230BDA1300A22534 /* CoreStoreDefaults.swift in Sources */,
 				B52DD1A51BE1F92F00949AFE /* ImportableUniqueObject.swift in Sources */,
@@ -2738,6 +2809,7 @@
 				B514EF1123A8DB190093DBA4 /* DiffableDataSource.Target.swift in Sources */,
 				B50E175A23517DE4004F033C /* Differentiable.swift in Sources */,
 				B52F744D1E9B8740005F3DAC /* CoreStoreSchema.swift in Sources */,
+				B56E4EE723CEDF0900E1708C /* Field.Computed.swift in Sources */,
 				B52DD19A1BE1F92800949AFE /* CoreStore+Logging.swift in Sources */,
 				B52DD1A71BE1F93200949AFE /* BaseDataTransaction+Querying.swift in Sources */,
 				B546F96C1C9AF26D00D5AC55 /* CSInMemoryStore.swift in Sources */,
@@ -2782,6 +2854,7 @@
 				B50E175F2351848E004F033C /* Internals.DiffableDataUIDispatcher.DiffResult.swift in Sources */,
 				B5474D182227C08700B21FEC /* Internals.CoreStoreFetchRequest.swift in Sources */,
 				B501322E2346A9B100FC238B /* ListPublisher.swift in Sources */,
+				B56E4EDC23CEB8E700E1708C /* FieldStorableType.swift in Sources */,
 				B56924021EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CB11FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				B5220E171D1306DF009BC71E /* UnsafeDataTransaction+Observing.swift in Sources */,
@@ -2797,8 +2870,10 @@
 				B5D339EA1E9493A500C880DE /* Entity.swift in Sources */,
 				B5BF7FC9234D7E460070E741 /* ObjectSnapshot.swift in Sources */,
 				B52DD1AA1BE1F93500949AFE /* TypeErasedClauses.swift in Sources */,
+				B56E4ED223CD9E4200E1708C /* Field.Stored.swift in Sources */,
 				B53FBA021CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
 				B51FE5AF1CD4D00300E54258 /* CoreStore+CustomDebugStringConvertible.swift in Sources */,
+				B56E4ECD23CD9B4800E1708C /* Field.swift in Sources */,
 				B509D7C223C8480B00F42824 /* Value.Optional.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -2895,6 +2970,7 @@
 				B563217F1BD65216006C9394 /* CoreStore.swift in Sources */,
 				B549F6751E56A92800FBAB2D /* CoreDataNativeType.swift in Sources */,
 				B509C7F61E54511B0061C547 /* ImportableAttributeType.swift in Sources */,
+				B56E4EEB23CF0C4500E1708C /* Field.PlistCoded.swift in Sources */,
 				B5E1B5961CAA0C15007FD580 /* CSObjectMonitor.swift in Sources */,
 				B50EE14423473C97009B8C47 /* CoreStoreObject+DataSources.swift in Sources */,
 				B55BB4D923503B9600C33E34 /* EnvironmentValues+DataSources.swift in Sources */,
@@ -2914,6 +2990,7 @@
 				B5202CFD1C046E8400DED140 /* NSFetchedResultsController+Convenience.swift in Sources */,
 				B5FE4DA91C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
 				B5831F442212700500D8604C /* Where.Expression.swift in Sources */,
+				B56E4EE123CEBCF000E1708C /* FieldOptionalType.swift in Sources */,
 				B5F8496E234898240029D57B /* ListSnapshot.swift in Sources */,
 				B51260951E9B28F100402229 /* Internals.EntityIdentifier.swift in Sources */,
 				B53FBA011CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
@@ -2941,6 +3018,7 @@
 				B5D8CA782346EAEF0055D7D1 /* DataStack+DataSources.swift in Sources */,
 				B56923C61EB823B4007C4DC9 /* NSEntityDescription+Migration.swift in Sources */,
 				B56321A71BD65216006C9394 /* MigrationResult.swift in Sources */,
+				B56E4ED623CDB54A00E1708C /* FieldProtocol.swift in Sources */,
 				B5DE5232230BDA1300A22534 /* CoreStoreDefaults.swift in Sources */,
 				B598514A1C90289E00C99590 /* NSPersistentStoreCoordinator+Setup.swift in Sources */,
 				B52F74471E9B8724005F3DAC /* XcodeDataModelSchema.swift in Sources */,
@@ -2971,6 +3049,7 @@
 				B514EF1023A8DB190093DBA4 /* DiffableDataSource.Target.swift in Sources */,
 				B563218A1BD65216006C9394 /* SynchronousDataTransaction.swift in Sources */,
 				B52F744C1E9B8740005F3DAC /* CoreStoreSchema.swift in Sources */,
+				B56E4EE623CEDF0900E1708C /* Field.Computed.swift in Sources */,
 				B5AEFAB71C9962AE00AD137F /* CoreStoreBridge.swift in Sources */,
 				B5E2222D1CA51B6E00BA2E95 /* CSUnsafeDataTransaction.swift in Sources */,
 				B50E174F23517C03004F033C /* Internals.DiffableDataUIDispatcher.StagedChangeset.swift in Sources */,
@@ -3015,6 +3094,7 @@
 				B5474D172227C08700B21FEC /* Internals.CoreStoreFetchRequest.swift in Sources */,
 				B501322D2346A9B000FC238B /* ListPublisher.swift in Sources */,
 				B56924011EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
+				B56E4EDB23CEB8E700E1708C /* FieldStorableType.swift in Sources */,
 				B5215CB01FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				B56321B41BD6521C006C9394 /* NSManagedObjectContext+Transaction.swift in Sources */,
 				B56923EE1EB827F6007C4DC9 /* SchemaMappingProvider.swift in Sources */,
@@ -3030,8 +3110,10 @@
 				B5BF7FC8234D7E460070E741 /* ObjectSnapshot.swift in Sources */,
 				B56321A41BD65216006C9394 /* CoreStore+Migration.swift in Sources */,
 				B5BF7FB9234C97CE0070E741 /* DiffableDataSource.TableViewAdapter-UIKit.swift in Sources */,
+				B56E4ED123CD9E4200E1708C /* Field.Stored.swift in Sources */,
 				B56321A01BD65216006C9394 /* ObjectObserver.swift in Sources */,
 				B56321951BD65216006C9394 /* TypeErasedClauses.swift in Sources */,
+				B56E4ECC23CD9B4800E1708C /* Field.swift in Sources */,
 				B509D7C023C8480B00F42824 /* Value.Optional.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

CoreStoreTests/DynamicModelTests.swift

@@ -38,14 +38,18 @@ import CoreStore
 
 class Animal: CoreStoreObject {
 
-    let species = Value.Required<String>("species", initial: "Swift")
+    @Field.Stored("species")
+    var species: String = "Swift"
+
     let master = Relationship.ToOne<Person>("master")
     let color = Transformable.Optional<Color>("color")
 }
 
 class Dog: Animal {
 
-    let nickname = Value.Optional<String>("nickname")
+    @Field.Stored("nickname")
+    var nickname: String?
+
     let age = Value.Required<Int>("age", initial: 1)
     let friends = Relationship.ToManyOrdered<Dog>("friends")
     let friendedBy = Relationship.ToManyUnordered<Dog>("friendedBy", inverse: { $0.friends })
@@ -53,24 +57,18 @@ class Dog: Animal {
 
 class Person: CoreStoreObject {
 
-    let title = Value.Required<String>(
+    @Field.Stored("title", customSetter: Person.setTitle(_:_:))
-        "title",
+    var title: String = "Mr."
-        initial: "Mr.",
-        customSetter: Person.setTitle
-    )
 
-    let name = Value.Required<String>(
+    @Field.Stored("name", customSetter: Person.setName(_:_:))
-        "name",
+    var name: String = ""
-        initial: "",
-        customSetter: Person.setName
-    )
 
-    let displayName = Value.Optional<String>(
+    @Field.Computed(
         "displayName",
-        isTransient: true,
         customGetter: Person.getDisplayName(_:),
         affectedByKeyPaths: Person.keyPathsAffectingDisplayName()
     )
+    var displayName: String?
 
     let spouse = Relationship.ToOne<Person>("spouse")
     
@@ -81,34 +79,34 @@ class Person: CoreStoreObject {
     
     private static func setTitle(_ partialObject: PartialObject<Person>, _ newValue: String) {
         
-        partialObject.setPrimitiveValue(newValue, for: { $0.title })
+        partialObject.setPrimitiveValue(newValue, for: \.$title)
-        partialObject.setPrimitiveValue(nil, for: { $0.displayName })
+        partialObject.setPrimitiveValue(nil, for: { $0.$displayName })
     }
     
     private static func setName(_ partialObject: PartialObject<Person>, _ newValue: String) {
         
-        partialObject.setPrimitiveValue(newValue, for: { $0.name })
+        partialObject.setPrimitiveValue(newValue, for: \.$name)
-        partialObject.setPrimitiveValue(nil, for: { $0.displayName })
+        partialObject.setPrimitiveValue(nil, for: \.$displayName)
     }
     
     static func getDisplayName(_ partialObject: PartialObject<Person>) -> String? {
         
-        if let displayName = partialObject.primitiveValue(for: { $0.displayName }) {
+        if let displayName = partialObject.primitiveValue(for: \.$displayName) {
             
             return displayName
         }
-        let title = partialObject.value(for: { $0.title })
+        let title = partialObject.value(for: \.$title)
-        let name = partialObject.value(for: { $0.name })
+        let name = partialObject.value(for: \.$name)
         let displayName = "\(title) \(name)"
-        partialObject.setPrimitiveValue(displayName, for: { $0.displayName })
+        partialObject.setPrimitiveValue(displayName, for: \.$displayName)
         return displayName
     }
     
     static func keyPathsAffectingDisplayName() -> Set<String> {
         
         return [
-            String(keyPath: \Person.title),
+            String(keyPath: \Person.$title),
-            String(keyPath: \Person.name)
+            String(keyPath: \Person.$name)
         ]
     }
 }
@@ -138,13 +136,13 @@ class DynamicModelTests: BaseTestDataTestCase {
         )
         self.prepareStack(dataStack, configurations: [nil]) { (stack) in
             
-            let k1 = String(keyPath: \Animal.species)
+            let k1 = String(keyPath: \Animal.$species)
             XCTAssertEqual(k1, "species")
 
-            let k2 = String(keyPath: \Dog.species)
+            let k2 = String(keyPath: \Dog.$species)
             XCTAssertEqual(k2, "species")
             
-            let k3 = String(keyPath: \Dog.nickname)
+            let k3 = String(keyPath: \Dog.$nickname)
             XCTAssertEqual(k3, "nickname")
             
             let updateDone = self.expectation(description: "update-done")
@@ -156,11 +154,11 @@ class DynamicModelTests: BaseTestDataTestCase {
                 asynchronous: { (transaction) in
                     
                     let animal = transaction.create(Into<Animal>())
-                    XCTAssertEqual(animal.species.value, "Swift")
+                    XCTAssertEqual(animal.species, "Swift")
-                    XCTAssertTrue(type(of: animal.species.value) == String.self)
+                    XCTAssertTrue(type(of: animal.species) == String.self)
                     
-                    animal.species .= "Sparrow"
+                    animal.species = "Sparrow"
-                    XCTAssertEqual(animal.species.value, "Sparrow")
+                    XCTAssertEqual(animal.species, "Sparrow")
                     
                     animal.color .= .yellow
                     XCTAssertEqual(animal.color.value, Color.yellow)
@@ -169,8 +167,8 @@ class DynamicModelTests: BaseTestDataTestCase {
 
                         switch property.keyPath {
 
-                        case String(keyPath: \Animal.species):
+                        case String(keyPath: \Animal.$species):
-                            XCTAssertTrue(property is ValueContainer<Animal>.Required<String>)
+                            XCTAssertTrue(property is FieldContainer<Animal>.Stored<String>)
 
                         case String(keyPath: \Animal.master):
                             XCTAssertTrue(property is RelationshipContainer<Animal>.ToOne<Person>)
@@ -184,16 +182,16 @@ class DynamicModelTests: BaseTestDataTestCase {
                     }
                     
                     let dog = transaction.create(Into<Dog>())
-                    XCTAssertEqual(dog.species.value, "Swift")
+                    XCTAssertEqual(dog.species, "Swift")
-                    XCTAssertEqual(dog.nickname.value, nil)
+                    XCTAssertEqual(dog.nickname, nil)
                     XCTAssertEqual(dog.age.value, 1)
 
                     for property in Dog.metaProperties(includeSuperclasses: true) {
 
                         switch property.keyPath {
 
-                        case String(keyPath: \Dog.species):
+                        case String(keyPath: \Dog.$species):
-                            XCTAssertTrue(property is ValueContainer<Animal>.Required<String>)
+                            XCTAssertTrue(property is FieldContainer<Animal>.Stored<String>)
 
                         case String(keyPath: \Dog.master):
                             XCTAssertTrue(property is RelationshipContainer<Animal>.ToOne<Person>)
@@ -201,8 +199,8 @@ class DynamicModelTests: BaseTestDataTestCase {
                         case String(keyPath: \Dog.color):
                             XCTAssertTrue(property is TransformableContainer<Animal>.Optional<Color>)
 
-                        case String(keyPath: \Dog.nickname):
+                        case String(keyPath: \Dog.$nickname):
-                            XCTAssertTrue(property is ValueContainer<Dog>.Optional<String>)
+                            XCTAssertTrue(property is FieldContainer<Dog>.Stored<String?>)
 
                         case String(keyPath: \Dog.age):
                             XCTAssertTrue(property is ValueContainer<Dog>.Required<Int>)
@@ -231,17 +229,17 @@ class DynamicModelTests: BaseTestDataTestCase {
 //
 //                    #endif
 
-                    let didSetObserver = dog.species.observe(options: [.new, .old]) { (object, change) in
+                    let didSetObserver = dog.observe(\.$species, options: [.new, .old]) { (object, change) in
 
                         XCTAssertEqual(object, dog)
                         XCTAssertEqual(change.kind, .setting)
                         XCTAssertEqual(change.newValue, "Dog")
                         XCTAssertEqual(change.oldValue, "Swift")
                         XCTAssertFalse(change.isPrior)
-                        XCTAssertEqual(object.species.value, "Dog")
+                        XCTAssertEqual(object.species, "Dog")
                         didSetObserverDone.fulfill()
                     }
-                    let willSetObserver = dog.species.observe(options: [.new, .old, .prior]) { (object, change) in
+                    let willSetObserver = dog.observe(\.$species, options: [.new, .old, .prior]) { (object, change) in
 
                         XCTAssertEqual(object, dog)
                         XCTAssertEqual(change.kind, .setting)
@@ -250,25 +248,25 @@ class DynamicModelTests: BaseTestDataTestCase {
                         if change.isPrior {
 
                             XCTAssertNil(change.newValue)
-                            XCTAssertEqual(object.species.value, "Swift")
+                            XCTAssertEqual(object.species, "Swift")
                             willSetPriorObserverDone.fulfill()
                         }
                         else {
 
                             XCTAssertEqual(change.newValue, "Dog")
-                            XCTAssertEqual(object.species.value, "Dog")
+                            XCTAssertEqual(object.species, "Dog")
                             willSetNotPriorObserverDone.fulfill()
                         }
                     }
                     
-                    dog.species .= "Dog"
+                    dog.species = "Dog"
-                    XCTAssertEqual(dog.species.value, "Dog")
+                    XCTAssertEqual(dog.species, "Dog")
 
                     didSetObserver.invalidate()
                     willSetObserver.invalidate()
                     
-                    dog.nickname .= "Spot"
+                    dog.nickname = "Spot"
-                    XCTAssertEqual(dog.nickname.value, "Spot")
+                    XCTAssertEqual(dog.nickname, "Spot")
                     
                     let person = transaction.create(Into<Person>())
                     XCTAssertTrue(person.pets.value.isEmpty)
@@ -280,7 +278,7 @@ class DynamicModelTests: BaseTestDataTestCase {
                         ["title", "name"]
                     )
                     
-                    person.name .= "Joe"
+                    person.name = "Joe"
                     
                     XCTAssertEqual(person.rawObject!.value(forKey: "name") as! String?, "Joe")
                     XCTAssertEqual(person.rawObject!.value(forKey: "displayName") as! String?, "Mr. Joe")
@@ -288,35 +286,35 @@ class DynamicModelTests: BaseTestDataTestCase {
                     person.rawObject!.setValue("AAAA", forKey: "displayName")
                     XCTAssertEqual(person.rawObject!.value(forKey: "displayName") as! String?, "AAAA")
                     
-                    person.name .= "John"
+                    person.name = "John"
-                    XCTAssertEqual(person.name.value, "John")
+                    XCTAssertEqual(person.name, "John")
-                    XCTAssertEqual(person.displayName.value, "Mr. John") // Custom getter
+                    XCTAssertEqual(person.displayName, "Mr. John") // Custom getter
                     
                     let personSnapshot1 = person.asSnapshot(in: transaction)!
-                    XCTAssertEqual(person.name.value, personSnapshot1.name)
+                    XCTAssertEqual(person.name, personSnapshot1.$name)
-                    XCTAssertEqual(person.title.value, personSnapshot1.title)
+                    XCTAssertEqual(person.title, personSnapshot1.$title)
-                    XCTAssertEqual(person.displayName.value, personSnapshot1.displayName)
+                    XCTAssertEqual(person.displayName, personSnapshot1.$displayName)
                     
-                    person.title .= "Sir"
+                    person.title = "Sir"
-                    XCTAssertEqual(person.displayName.value, "Sir John")
+                    XCTAssertEqual(person.displayName, "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.asSnapshot(in: transaction)!
-                    XCTAssertEqual(person.name.value, personSnapshot2.name)
+                    XCTAssertEqual(person.name, personSnapshot2.$name)
-                    XCTAssertEqual(person.title.value, personSnapshot2.title)
+                    XCTAssertEqual(person.title, personSnapshot2.$title)
-                    XCTAssertEqual(person.displayName.value, personSnapshot2.displayName)
+                    XCTAssertEqual(person.displayName, personSnapshot2.$displayName)
 
                     var personSnapshot3 = personSnapshot2
-                    personSnapshot3.name = "James"
+                    personSnapshot3.$name = "James"
-                    XCTAssertEqual(personSnapshot1.name, "John")
+                    XCTAssertEqual(personSnapshot1.$name, "John")
-                    XCTAssertEqual(personSnapshot1.displayName, "Mr. John")
+                    XCTAssertEqual(personSnapshot1.$displayName, "Mr. John")
-                    XCTAssertEqual(personSnapshot2.name, "John")
+                    XCTAssertEqual(personSnapshot2.$name, "John")
-                    XCTAssertEqual(personSnapshot2.displayName, "Sir John")
+                    XCTAssertEqual(personSnapshot2.$displayName, "Sir John")
-                    XCTAssertEqual(personSnapshot3.name, "James")
+                    XCTAssertEqual(personSnapshot3.$name, "James")
-                    XCTAssertEqual(personSnapshot3.displayName, "Sir John")
+                    XCTAssertEqual(personSnapshot3.$displayName, "Sir John")
 
                     
                     person.pets.value.insert(dog)
@@ -338,20 +336,20 @@ class DynamicModelTests: BaseTestDataTestCase {
             stack.perform(
                 asynchronous: { (transaction) in
                     
-                    let p1 = Where<Animal>({ $0.species == "Sparrow" })
+                    let p1 = Where<Animal>({ $0.$species == "Sparrow" })
                     XCTAssertEqual(p1.predicate, NSPredicate(format: "%K == %@", "species", "Sparrow"))
                     
                     let bird = try transaction.fetchOne(From<Animal>(), p1)
                     XCTAssertNotNil(bird)
-                    XCTAssertEqual(bird!.species.value, "Sparrow")
+                    XCTAssertEqual(bird!.species, "Sparrow")
                     
-                    let p2 = Where<Dog>({ $0.nickname == "Spot" })
+                    let p2 = Where<Dog>({ $0.$nickname == "Spot" })
                     XCTAssertEqual(p2.predicate, NSPredicate(format: "%K == %@", "nickname", "Spot"))
                     
-                    let dog = try transaction.fetchOne(From<Dog>().where(\.nickname == "Spot"))
+                    let dog = try transaction.fetchOne(From<Dog>().where(\.$nickname == "Spot"))
                     XCTAssertNotNil(dog)
-                    XCTAssertEqual(dog!.nickname.value, "Spot")
+                    XCTAssertEqual(dog!.nickname, "Spot")
-                    XCTAssertEqual(dog!.species.value, "Dog")
+                    XCTAssertEqual(dog!.species, "Dog")
                     
                     let person = try transaction.fetchOne(From<Person>())
                     XCTAssertNotNil(person)
@@ -365,12 +363,12 @@ class DynamicModelTests: BaseTestDataTestCase {
                     
                     _ = try transaction.fetchAll(
                         From<Dog>()
-                            .where(\Animal.species == "Dog" && \Dog.age == 10)
+                            .where(\Animal.$species == "Dog" && \Dog.age == 10)
                     )
                     _ = try transaction.fetchAll(
                         From<Dog>()
-                            .where(\Dog.age == 10 && \Animal.species == "Dog")
+                            .where(\Dog.age == 10 && \Animal.$species == "Dog")
-                            .orderBy(.ascending({ $0.species }))
+                            .orderBy(.ascending({ $0.$species }))
                     )
                     _ = try transaction.fetchAll(
                         From<Dog>(),
@@ -378,11 +376,11 @@ class DynamicModelTests: BaseTestDataTestCase {
                     )
                     _ = try transaction.fetchAll(
                         From<Dog>(),
-                        Where<Dog>({ $0.species == "Dog" && $0.age == 10 })
+                        Where<Dog>({ $0.$species == "Dog" && $0.age == 10 })
                     )
                     _ = try transaction.fetchAll(
                         From<Dog>(),
-                        Where<Dog>({ $0.age == 10 && $0.species == "Dog" })
+                        Where<Dog>({ $0.age == 10 && $0.$species == "Dog" })
                     )
                     _ = try transaction.fetchAll(
                         From<Dog>(),
@@ -409,8 +407,8 @@ class DynamicModelTests: BaseTestDataTestCase {
     @objc
     dynamic func test_ThatDynamicModelKeyPaths_CanBeCreated() {
         
-        XCTAssertEqual(String(keyPath: \Animal.species), "species")
+        XCTAssertEqual(String(keyPath: \Animal.$species), "species")
-        XCTAssertEqual(String(keyPath: \Dog.species), "species")
+        XCTAssertEqual(String(keyPath: \Dog.$species), "species")
     }
     
     @nonobjc

CoreStoreTests/ListObserverTests.swift

@@ -53,7 +53,7 @@ class ListObserverTests: BaseTestDataTestCase {
             
             var events = 0
             
-            let willChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorWillChange:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -67,7 +67,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 0
                 }
             )
-            let didInsertSectionExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitor:didInsertSection:toSectionIndex:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -87,7 +87,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 1
                 }
             )
-            let didInsertObjectExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitor:didInsertObject:toIndexPath:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -119,7 +119,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 2
                 }
             )
-            let didChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorDidChange:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -184,7 +184,7 @@ class ListObserverTests: BaseTestDataTestCase {
             
             var events = 0
             
-            let willChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorWillChange:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -199,7 +199,7 @@ class ListObserverTests: BaseTestDataTestCase {
                 }
             )
             
-            let didUpdateObjectExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitor:didUpdateObject:atIndexPath:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -250,7 +250,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 1 || events == 2
                 }
             )
-            let didChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorDidChange:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -329,7 +329,7 @@ class ListObserverTests: BaseTestDataTestCase {
             
             var events = 0
             
-            let willChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorWillChange:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -343,7 +343,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 0
                 }
             )
-            let didMoveObjectExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitor:didMoveObject:fromIndexPath:toIndexPath:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -376,7 +376,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 1
                 }
             )
-            let didChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorDidChange:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -437,7 +437,7 @@ class ListObserverTests: BaseTestDataTestCase {
             
             var events = 0
             
-            let willChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorWillChange:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -451,7 +451,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 0
                 }
             )
-            let didUpdateObjectExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitor:didDeleteObject:fromIndexPath:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -480,7 +480,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 1 || events == 2
                 }
             )
-            let didDeleteSectionExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitor:didDeleteSection:fromSectionIndex:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -508,7 +508,7 @@ class ListObserverTests: BaseTestDataTestCase {
                     return events == 3
                 }
             )
-            let didChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorDidChange:"),
                 object: observer,
                 handler: { (note) -> Bool in

CoreStoreTests/ObjectObserverTests.swift

@@ -57,7 +57,7 @@ class ObjectObserverTests: BaseTestDataTestCase {
             
             var events = 0
             
-            let willUpdateExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "objectMonitor:willUpdateObject:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -74,7 +74,7 @@ class ObjectObserverTests: BaseTestDataTestCase {
                     return events == 0
                 }
             )
-            let didUpdateExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "objectMonitor:didUpdateObject:changedPersistentKeys:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -154,7 +154,7 @@ class ObjectObserverTests: BaseTestDataTestCase {
             
             var events = 0
             
-            let didDeleteExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "objectMonitor:didDeleteObject:"),
                 object: observer,
                 handler: { (note) -> Bool in

CoreStoreTests/TransactionTests.swift

@@ -400,7 +400,7 @@ final class TransactionTests: BaseTestCase {
             XCTAssertFalse(monitor.hasObjects())
             
             var events = 0
-            let willChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorWillChange:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -414,7 +414,7 @@ final class TransactionTests: BaseTestCase {
                     return events == 0
                 }
             )
-            let didInsertObjectExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitor:didInsertObject:toIndexPath:"),
                 object: observer,
                 handler: { (note) -> Bool in
@@ -444,7 +444,7 @@ final class TransactionTests: BaseTestCase {
                     return events == 1
                 }
             )
-            let didChangeExpectation = self.expectation(
+            _ = self.expectation(
                 forNotification: NSNotification.Name(rawValue: "listMonitorDidChange:"),
                 object: observer,
                 handler: { (note) -> Bool in

CoreStoreTests/WhereTests.swift

@@ -109,8 +109,8 @@ final class WhereTests: XCTestCase {
                 )
                 XCTAssertAllEqual(
                     "master.pets.species",
-                    (\Animal.master ~ \.pets ~ \.species).description,
+                    (\Animal.master ~ \.pets ~ \.$species).description,
-                    String(keyPath: \Animal.master ~ \.pets ~ \.species)
+                    String(keyPath: \Animal.master ~ \.pets ~ \.$species)
                 )
                 XCTAssertAllEqual(
                     "master.pets.master",
@@ -167,8 +167,8 @@ final class WhereTests: XCTestCase {
                 )
                 XCTAssertAllEqual(
                     "ANY master.pets.species",
-                    (\Animal.master ~ \.pets ~ \.species).any().description,
+                    (\Animal.master ~ \.pets ~ \.$species).any().description,
-                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).any())
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.$species).any())
                 )
             }
         }
@@ -196,8 +196,8 @@ final class WhereTests: XCTestCase {
                 )
                 XCTAssertAllEqual(
                     "ALL master.pets.species",
-                    (\Animal.master ~ \.pets ~ \.species).all().description,
+                    (\Animal.master ~ \.pets ~ \.$species).all().description,
-                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).all())
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.$species).all())
                 )
             }
         }
@@ -225,8 +225,8 @@ final class WhereTests: XCTestCase {
                 )
                 XCTAssertAllEqual(
                     "NONE master.pets.species",
-                    (\Animal.master ~ \.pets ~ \.species).none().description,
+                    (\Animal.master ~ \.pets ~ \.$species).none().description,
-                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).none())
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.$species).none())
                 )
             }
         }
@@ -247,7 +247,7 @@ final class WhereTests: XCTestCase {
             }
             do {
 
-                let whereClause: Where<Animal> = (\.master ~ \.name) == dummy
+                let whereClause: Where<Animal> = (\.master ~ \.$name) == dummy
                 let predicate = NSPredicate(format: "master.name == %@", dummy)
                 XCTAssertAllEqual(whereClause, Where<Animal>(predicate))
                 XCTAssertAllEqual(whereClause.predicate, predicate)
@@ -265,7 +265,7 @@ final class WhereTests: XCTestCase {
             }
             do {
 
-                let whereClause: Where<Animal> = (\.master ~ \.spouse ~ \.name) == dummy
+                let whereClause: Where<Animal> = (\.master ~ \.spouse ~ \.$name) == dummy
                 let predicate = NSPredicate(format: "master.spouse.name == %@", dummy)
                 XCTAssertAllEqual(whereClause, Where<Animal>(predicate))
                 XCTAssertAllEqual(whereClause.predicate, predicate)
@@ -301,7 +301,7 @@ final class WhereTests: XCTestCase {
             }
             do {
 
-                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).any() == dummy
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.$species).any() == dummy
                 let predicate = NSPredicate(format: "ANY master.pets.species == %@", dummy)
                 XCTAssertAllEqual(whereClause, Where<Animal>(predicate))
                 XCTAssertAllEqual(whereClause.predicate, predicate)
@@ -319,7 +319,7 @@ final class WhereTests: XCTestCase {
             }
             do {
 
-                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).all() == dummy
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.$species).all() == dummy
                 let predicate = NSPredicate(format: "ALL master.pets.species == %@", dummy)
                 XCTAssertAllEqual(whereClause, Where<Animal>(predicate))
                 XCTAssertAllEqual(whereClause.predicate, predicate)
@@ -337,7 +337,7 @@ final class WhereTests: XCTestCase {
             }
             do {
 
-                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).none() == dummy
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.$species).none() == dummy
                 let predicate = NSPredicate(format: "NONE master.pets.species == %@", dummy)
                 XCTAssertAllEqual(whereClause, Where<Animal>(predicate))
                 XCTAssertAllEqual(whereClause.predicate, predicate)

Sources/AttributeProtocol.swift

@@ -29,7 +29,7 @@ import CoreData
 
 // MARK: - AttributeProtocol
 
-internal protocol AttributeProtocol: PropertyProtocol {
+internal protocol AttributeProtocol: AnyObject, PropertyProtocol {
 
     typealias EntityDescriptionValues = (
         attributeType: NSAttributeType,

Sources/CoreStore+CustomDebugStringConvertible.swift

@@ -94,9 +94,10 @@ extension CoreStoreError: CustomDebugStringConvertible, CoreStoreDebugStringConv
             firstLine = ".progressiveMigrationRequired"
             info.append(("localStoreURL", localStoreURL))
 
-        case .asynchronousMigrationRequired(let localStoreURL):
+        case .asynchronousMigrationRequired(let localStoreURL, let NSError):
             firstLine = ".asynchronousMigrationRequired"
             info.append(("localStoreURL", localStoreURL))
+            info.append(("NSError", NSError))
             
         case .internalError(let NSError):
             firstLine = ".internalError"

Sources/CoreStoreError.swift

@@ -199,9 +199,6 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
         case (.userError(let error1), .userError(let error2)):
             switch (error1, error2) {
             
-            case (let error1 as AnyHashable, let error2 as AnyHashable):
-                return error1 == error2
-            
             case (let error1 as NSError, let error2 as NSError):
                 return error1.isEqual(error2)
             }

Sources/CoreStoreObject+DataSources.swift

@@ -1,9 +1,26 @@
 //
 //  CoreStoreObject+DataSources.swift
-//  CoreStore iOS
+//  CoreStore
 //
-//  Created by John Estropia on 2019/10/04.
+//  Copyright © 2020 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(UIKit) || canImport(AppKit)

Sources/CoreStoreObject+Observing.swift

@@ -27,6 +27,33 @@ import Foundation
 import CoreData
 
 
+extension DynamicObject where Self: CoreStoreObject {
+
+    public func observe<O, V>(_ keyPath: KeyPath<Self, FieldContainer<O>.Stored<V>>, options: NSKeyValueObservingOptions = [], changeHandler: @escaping (Self, CoreStoreObjectValueDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        let result = _CoreStoreObjectKeyValueObservation(
+            object: self.rawObject!,
+            keyPath: self[keyPath: keyPath].keyPath,
+            callback: { (object, kind, newValue, oldValue, _, isPrior) in
+
+                let notification = CoreStoreObjectValueDiff<V>(
+                    kind: kind,
+                    newNativeValue: newValue as? V.QueryableNativeType,
+                    oldNativeValue: oldValue as? V.QueryableNativeType,
+                    isPrior: isPrior
+                )
+                changeHandler(
+                    Self.cs_fromRaw(object: object),
+                    notification
+                )
+            }
+        )
+        result.start(options)
+        return result
+    }
+}
+
+
 // MARK: CoreStoreObjectKeyValueObservation
 
 /**

Sources/CoreStoreObject+Querying.swift

@@ -26,6 +26,88 @@
 import CoreData
 import Foundation
 
+// MARK: - FieldContainer.Value
+
+extension FieldContainer.Stored {
+
+    /**
+     Creates a `Where` clause by comparing if a property is equal to a value
+     ```
+     let person = dataStack.fetchOne(From<Person>().where({ $0.nickname == "John" }))
+     ```
+     */
+    public static func == (_ attribute: Self, _ value: V) -> Where<O> {
+
+        return Where(attribute.keyPath, isEqualTo: value)
+    }
+
+    /**
+     Creates a `Where` clause by comparing if a property is not equal to a value
+     ```
+     let person = dataStack.fetchOne(From<Person>().where({ $0.nickname != "John" }))
+     ```
+     */
+    public static func != (_ attribute: Self, _ value: V) -> Where<O> {
+
+        return !Where(attribute.keyPath, isEqualTo: value)
+    }
+
+    /**
+     Creates a `Where` clause by comparing if a property is less than a value
+     ```
+     let person = dataStack.fetchOne(From<Person>().where({ $0.age < 20 }))
+     ```
+     */
+    public static func < (_ attribute: Self, _ value: V) -> Where<O> {
+
+        return Where("%K < %@", attribute.keyPath, value.cs_toFieldStoredNativeType() as Any)
+    }
+
+    /**
+     Creates a `Where` clause by comparing if a property is greater than a value
+     ```
+     let person = dataStack.fetchOne(From<Person>().where({ $0.age > 20 }))
+     ```
+     */
+    public static func > (_ attribute: Self, _ value: V) -> Where<O> {
+
+        return Where("%K > %@", attribute.keyPath, value.cs_toFieldStoredNativeType() as Any)
+    }
+
+    /**
+     Creates a `Where` clause by comparing if a property is less than or equal to a value
+     ```
+     let person = dataStack.fetchOne(From<Person>().where({ $0.age <= 20 }))
+     ```
+     */
+    public static func <= (_ attribute: Self, _ value: V) -> Where<O> {
+
+        return Where("%K <= %@", attribute.keyPath, value.cs_toFieldStoredNativeType() as Any)
+    }
+
+    /**
+     Creates a `Where` clause by comparing if a property is greater than or equal to a value
+     ```
+     let person = dataStack.fetchOne(From<Person>().where({ $0.age >= 20 }))
+     ```
+     */
+    public static func >= (_ attribute: Self, _ value: V) -> Where<O> {
+
+        return Where("%K >= %@", attribute.keyPath, value.cs_toFieldStoredNativeType() as Any)
+    }
+
+    /**
+     Creates a `Where` clause by checking if a sequence contains the value of a property
+     ```
+     let dog = dataStack.fetchOne(From<Dog>().where({ ["Pluto", "Snoopy", "Scooby"] ~= $0.nickname }))
+     ```
+     */
+    public static func ~= <S: Sequence>(_ sequence: S, _ attribute: Self) -> Where<O> where S.Iterator.Element == V {
+
+        return Where(attribute.keyPath, isMemberOf: sequence)
+    }
+}
+
 // MARK: - ValueContainer.Required
 
 extension ValueContainer.Required {

Sources/CoreStoreObject.swift

@@ -69,6 +69,11 @@ open /*abstract*/ class CoreStoreObject: DynamicObject, Hashable {
         
         self.isMeta = false
         self.rawObject = (rawObject as! CoreStoreManagedObject)
+
+        guard Self.meta.needsReflection else {
+
+            return
+        }
         self.registerReceiver(
             mirror: Mirror(reflecting: self),
             object: self
@@ -117,6 +122,11 @@ open /*abstract*/ class CoreStoreObject: DynamicObject, Hashable {
     internal let rawObject: CoreStoreManagedObject?
     internal let isMeta: Bool
 
+    internal lazy var needsReflection: Bool = self.containsLegacyAttributes(
+        mirror: Mirror(reflecting: self),
+        object: self
+    )
+
     internal class func metaProperties(includeSuperclasses: Bool) -> [PropertyProtocol] {
 
         func keyPaths(_ allKeyPaths: inout [PropertyProtocol], for dynamicType: CoreStoreObject.Type) {
@@ -141,6 +151,30 @@ open /*abstract*/ class CoreStoreObject: DynamicObject, Hashable {
     
     // MARK: Private
 
+    private func containsLegacyAttributes(mirror: Mirror, object: CoreStoreObject) -> Bool {
+
+        if let superclassMirror = mirror.superclassMirror,
+            self.containsLegacyAttributes(mirror: superclassMirror, object: object) {
+
+            return true
+        }
+        for child in mirror.children {
+
+            switch child.value {
+
+            case is AttributeProtocol:
+                return true
+
+            case is RelationshipProtocol:
+                return true
+
+            default:
+                continue
+            }
+        }
+        return false
+    }
+    
     private func registerReceiver(mirror: Mirror, object: CoreStoreObject) {
         
         if let superclassMirror = mirror.superclassMirror {

Sources/CoreStoreSchema.swift

@@ -287,6 +287,25 @@ public final class CoreStoreSchema: DynamicSchema {
                 
                 switch property {
 
+                case let attribute as FieldAttributeProtocol:
+                    Internals.assert(
+                        !NSManagedObject.instancesRespond(to: Selector(attribute.keyPath)),
+                        "Attribute Property name \"\(String(reflecting: entity.type)).\(attribute.keyPath)\" is not allowed because it collides with \"\(String(reflecting: NSManagedObject.self)).\(attribute.keyPath)\""
+                    )
+                    let entityDescriptionValues = attribute.entityDescriptionValues()
+                    let description = NSAttributeDescription()
+                    description.name = attribute.keyPath
+                    description.attributeType = entityDescriptionValues.attributeType
+                    description.isOptional = entityDescriptionValues.isOptional
+                    description.defaultValue = entityDescriptionValues.defaultValue
+                    description.isTransient = entityDescriptionValues.isTransient
+                    description.allowsExternalBinaryDataStorage = entityDescriptionValues.allowsExternalBinaryDataStorage
+                    description.versionHashModifier = entityDescriptionValues.versionHashModifier
+                    description.renamingIdentifier = entityDescriptionValues.renamingIdentifier
+                    propertyDescriptions.append(description)
+                    keyPathsByAffectedKeyPaths[attribute.keyPath] = entityDescriptionValues.affectedByKeyPaths
+                    customGetterSetterByKeyPaths[attribute.keyPath] = (attribute.getter, attribute.setter)
+                    
                 case let attribute as AttributeProtocol:
                     Internals.assert(
                         !NSManagedObject.instancesRespond(to: Selector(attribute.keyPath)),

Sources/DynamicObject.swift

@@ -153,41 +153,68 @@ extension CoreStoreObject {
 
     public class func cs_snapshotDictionary(id: ObjectID, context: NSManagedObjectContext) -> [String: Any]? {
 
-        func initializeAttributes(mirror: Mirror, object: Self, into attributes: inout [KeyPathString: Any]) {
+        var values: [KeyPathString: Any] = [:]
+        if self.meta.needsReflection {
 
-            if let superClassMirror = mirror.superclassMirror {
+            func initializeAttributes(mirror: Mirror, object: Self, into attributes: inout [KeyPathString: Any]) {
 
-                initializeAttributes(
+                if let superClassMirror = mirror.superclassMirror {
-                    mirror: superClassMirror,
+
-                    object: object,
+                    initializeAttributes(
-                    into: &attributes
+                        mirror: superClassMirror,
-                )
+                        object: object,
+                        into: &attributes
+                    )
+                }
+                for child in mirror.children {
+
+                    switch child.value {
+
+                    case let property as FieldAttributeProtocol:
+                        attributes[property.keyPath] = type(of: property).read(field: property, for: object.rawObject!)
+
+                    case let property as AttributeProtocol:
+                        attributes[property.keyPath] = property.valueForSnapshot
+
+                    case let property as RelationshipProtocol:
+                        attributes[property.keyPath] = property.valueForSnapshot
+
+                    default:
+                        continue
+                    }
+                }
             }
-            for child in mirror.children {
+            guard let object = context.fetchExisting(id) as CoreStoreObject? else {
 
-                switch child.value {
+                return nil
+            }
+            initializeAttributes(
+                mirror: Mirror(reflecting: object),
+                object: object as! Self,
+                into: &values
+            )
+        }
+        else {
 
-                case let property as AttributeProtocol:
+            guard
-                    attributes[property.keyPath] = property.valueForSnapshot
+                let object = context.fetchExisting(id) as CoreStoreObject?,
+                let rawObject = object.rawObject
+                else {
 
-                case let property as RelationshipProtocol:
+                    return nil
-                    attributes[property.keyPath] = property.valueForSnapshot
+            }
+            for property in self.metaProperties(includeSuperclasses: true) {
+
+                switch property {
+
+                case let property as FieldAttributeProtocol:
+                    values[property.keyPath] = type(of: property).read(field: property, for: rawObject)
 
                 default:
                     continue
                 }
             }
         }
-        guard let object = context.fetchExisting(id) as CoreStoreObject? else {
-
-            return nil
-        }
-        var values: [KeyPathString: Any] = [:]
-        initializeAttributes(
-            mirror: Mirror(reflecting: object),
-            object: object as! Self,
-            into: &values
-        )
         return values
     }
     

Sources/DynamicObjectMeta.swift

@@ -1,143 +0,0 @@
-//
-//  DynamicObjectMeta.swift
-//  CoreStore iOS
-//
-//  Created by John Estropia on 2019/08/20.
-//  Copyright © 2019 John Rommel Estropia. All rights reserved.
-//
-
-#if swift(>=5.1)
-
-import CoreData
-import Foundation
-
-
-// MARK: - DynamicObjectMeta
-
-@dynamicMemberLookup
-public struct DynamicObjectMeta<R, D>: CustomDebugStringConvertible {
-
-    // MARK: Public
-
-    public typealias Root = R
-    public typealias Destination = D
-
-    
-    // MARK: CustomDebugStringConvertible
-
-    public var debugDescription: String {
-
-        return self.keyPathString
-    }
-
-
-    // MARK: Internal
-
-    internal let keyPathString: KeyPathString
-
-    internal init(keyPathString: KeyPathString) {
-
-        self.keyPathString = keyPathString
-    }
-
-    internal func appending<D2>(keyPathString: KeyPathString) -> DynamicObjectMeta<(R, D), D2> {
-
-        return .init(keyPathString: [self.keyPathString, keyPathString].joined(separator: "."))
-    }
-}
-
-
-// MARK: - DynamicObjectMeta where Destination: NSManagedObject
-
-extension DynamicObjectMeta where Destination: NSManagedObject {
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<V: AllowedObjectiveCAttributeKeyPathValue>(dynamicMember member: KeyPath<Destination, V>) -> DynamicObjectMeta<(Root, Destination), V.ReturnValueType> {
-
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<V: NSManagedObject>(dynamicMember member: KeyPath<Destination, V>) -> DynamicObjectMeta<(Root, Destination), V> {
-
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<V: NSManagedObject>(dynamicMember member: KeyPath<Destination, V?>) -> DynamicObjectMeta<(Root, Destination), V> {
-
-        // TODO: not working
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<V: NSOrderedSet>(dynamicMember member: KeyPath<Destination, V>) -> DynamicObjectMeta<(Root, Destination), V> {
-
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<V: NSOrderedSet>(dynamicMember member: KeyPath<Destination, V?>) -> DynamicObjectMeta<(Root, Destination), V> {
-
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<V: NSSet>(dynamicMember member: KeyPath<Destination, V>) -> DynamicObjectMeta<(Root, Destination), V> {
-
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<V: NSSet>(dynamicMember member: KeyPath<Destination, V?>) -> DynamicObjectMeta<(Root, Destination), V> {
-
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-}
-
-
-// MARK: - DynamicObjectMeta where Destination: CoreStoreObject
-
-extension DynamicObjectMeta where Destination: CoreStoreObject {
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<K: AttributeKeyPathStringConvertible>(dynamicMember member: KeyPath<Destination, K>) -> DynamicObjectMeta<(Root, Destination), K.ReturnValueType> {
-
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-
-    /**
-     Returns the value for the property identified by a given key.
-     */
-    public subscript<K: RelationshipKeyPathStringConvertible>(dynamicMember member: KeyPath<Destination, K>) -> DynamicObjectMeta<(Root, Destination), K.DestinationValueType> {
-
-        let keyPathString = String(keyPath: member)
-        return self.appending(keyPathString: keyPathString)
-    }
-}
-
-#endif

Sources/Field.Computed.swift

@@ -0,0 +1,305 @@
+//
+//  Field.Computed.swift
+//  CoreStore
+//
+//  Copyright © 2020 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 CoreData
+import Foundation
+
+
+// MARK: - FieldContainer
+
+extension FieldContainer {
+
+    // MARK: - Computed
+
+    /**
+     The containing type for computed property values. Any type that conforms to `FieldStorableType` are supported.
+     ```
+     class Animal: CoreStoreObject {
+         @Field.Stored("species")
+         var species = ""
+
+         @Field.Computed("pluralName", customGetter: Animal.pluralName(_:))
+         var pluralName: String = ""
+
+         @Field.PlistCoded("color")
+         var color: UIColor?
+     }
+     ```
+     - Important: `Field` properties are required to be used as `@propertyWrapper`s. Any other declaration not using the `@Field.Computed(...) var` syntax will be ignored.
+     */
+    @propertyWrapper
+    public struct Computed<V>: AttributeKeyPathStringConvertible, FieldAttributeProtocol {
+
+        /**
+         Initializes the metadata for the property.
+         ```
+         class Person: CoreStoreObject {
+             @Field.Stored("title")
+             var title: String = "Mr."
+
+             @Field.Stored("name")
+             var name: String = ""
+
+             @Field.Computed("displayName", customGetter: Person.getName(_:))
+             var displayName: String = ""
+
+             private static func getName(_ partialObject: PartialObject<Person>) -> String {
+                 let cachedDisplayName = partialObject.primitiveValue(for: \.$displayName)
+                 if !cachedDisplayName.isEmpty {
+                     return cachedDisplayName
+                 }
+                 let title = partialObject.value(for: \.$title)
+                 let name = partialObject.value(for: \.$name)
+                 let displayName = "\(title) \(name)"
+                 partialObject.setPrimitiveValue(displayName, for: { $0.displayName })
+                 return displayName
+             }
+         }
+         ```
+         - parameter keyPath: the permanent attribute name for this property.
+         - parameter renamingIdentifier: used to resolve naming conflicts between models. When creating an entity mapping between entities in two managed object models, a source entity property and a destination entity property that share the same identifier indicate that a property mapping should be configured to migrate from the source to the destination. If unset, the identifier will be the property's name.
+         - parameter customGetter: use this closure as an "override" for the default property getter. The closure receives a `PartialObject<O>`, which acts as a fast, type-safe KVC interface for `CoreStoreObject`. The reason a `CoreStoreObject` instance is not passed directly is because the Core Data runtime is not aware of `CoreStoreObject` properties' static typing, and so loading those info everytime KVO invokes this accessor method incurs a cumulative performance hit (especially in KVO-heavy operations such as `ListMonitor` observing.) When accessing the property value from `PartialObject<O>`, make sure to use `PartialObject<O>.primitiveValue(for:)` instead of `PartialObject<O>.value(for:)`, which would unintentionally execute the same closure again recursively.
+         - parameter customSetter: use this closure as an "override" for the default property setter. The closure receives a `PartialObject<O>`, which acts as a fast, type-safe KVC interface for `CoreStoreObject`. The reason a `CoreStoreObject` instance is not passed directly is because the Core Data runtime is not aware of `CoreStoreObject` properties' static typing, and so loading those info everytime KVO invokes this accessor method incurs a cumulative performance hit (especially in KVO-heavy operations such as `ListMonitor` observing.) When accessing the property value from `PartialObject<O>`, make sure to use `PartialObject<O>.setPrimitiveValue(_:for:)` instead of `PartialObject<O>.setValue(_:for:)`, which would unintentionally execute the same closure again recursively.
+         - parameter affectedByKeyPaths: a set of key paths for properties whose values affect the value of the receiver. This is similar to `NSManagedObject.keyPathsForValuesAffectingValue(forKey:)`.
+         */
+        public init(
+            _ keyPath: KeyPathString,
+            renamingIdentifier: @autoclosure @escaping () -> String? = nil,
+            customGetter: ((_ partialObject: PartialObject<O>) -> V)? = nil,
+            customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? = nil,
+            affectedByKeyPaths: @autoclosure @escaping () -> Set<KeyPathString> = []) {
+
+            self.init(
+                keyPath: keyPath,
+                isOptional: false,
+                renamingIdentifier: renamingIdentifier,
+                customGetter: customGetter,
+                customSetter: customSetter,
+                affectedByKeyPaths: affectedByKeyPaths
+            )
+        }
+
+        /**
+         Overload for compiler message only
+         */
+        @available(*, unavailable, message: "Field.Computed properties are not allowed to have default values.")
+        public init(
+            wrappedValue initial: @autoclosure @escaping () -> V,
+            _ keyPath: KeyPathString,
+            versionHashModifier: @autoclosure @escaping () -> String? = nil,
+            renamingIdentifier: @autoclosure @escaping () -> String? = nil,
+            customGetter: ((_ partialObject: PartialObject<O>) -> V)? = nil,
+            customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? = nil,
+            affectedByKeyPaths: @autoclosure @escaping () -> Set<KeyPathString> = []) {
+
+            fatalError()
+        }
+
+
+        // MARK: @propertyWrapper
+
+        @available(*, unavailable)
+        public var wrappedValue: V {
+
+            get { fatalError() }
+            set { fatalError() }
+        }
+
+        public var projectedValue: Self {
+
+            return self
+        }
+
+        public static subscript(
+            _enclosingInstance instance: O,
+            wrapped wrappedKeyPath: ReferenceWritableKeyPath<O, V>,
+            storage storageKeyPath: ReferenceWritableKeyPath<O, Self>
+        ) -> V {
+
+            get {
+
+                Internals.assert(
+                    instance.rawObject != nil,
+                    "Attempted to access values from a \(Internals.typeName(O.self)) meta object. Meta objects are only used for querying keyPaths and infering types."
+                )
+                return self.read(field: instance[keyPath: storageKeyPath], for: instance.rawObject!) as! V
+            }
+            set {
+
+                Internals.assert(
+                    instance.rawObject != nil,
+                    "Attempted to access values from a \(Internals.typeName(O.self)) meta object. Meta objects are only used for querying keyPaths and infering types."
+                )
+                return self.modify(field: instance[keyPath: storageKeyPath], for: instance.rawObject!, newValue: newValue)
+            }
+        }
+
+
+        // MARK: AnyKeyPathStringConvertible
+
+        public var cs_keyPathString: String {
+
+            return self.keyPath
+        }
+
+
+        // MARK: KeyPathStringConvertible
+
+        public typealias ObjectType = O
+        public typealias DestinationValueType = V
+
+
+        // MARK: AttributeKeyPathStringConvertible
+
+        public typealias ReturnValueType = DestinationValueType
+
+
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
+
+
+        // MARK: FieldProtocol
+
+        internal static func read(field: FieldProtocol, for rawObject: CoreStoreManagedObject) -> Any? {
+
+            Internals.assert(
+                rawObject.isRunningInAllowedQueue() == true,
+                "Attempted to access \(Internals.typeName(O.self))'s value outside it's designated queue."
+            )
+            let field = field as! Self
+            if let customGetter = field.customGetter {
+
+                return customGetter(PartialObject<O>(rawObject))
+            }
+            let keyPath = field.keyPath
+            switch rawObject.value(forKey: keyPath) {
+
+            case let rawValue as V:
+                return rawValue
+
+            default:
+                return nil
+            }
+        }
+
+        internal static func modify(field: FieldProtocol, for rawObject: CoreStoreManagedObject, newValue: Any?) {
+
+            Internals.assert(
+                rawObject.isRunningInAllowedQueue() == true,
+                "Attempted to access \(Internals.typeName(O.self))'s value outside it's designated queue."
+            )
+            Internals.assert(
+                rawObject.isEditableInContext() == true,
+                "Attempted to update a \(Internals.typeName(O.self))'s value from outside a transaction."
+            )
+            let newValue = newValue as! V
+            let field = field as! Self
+            let keyPath = field.keyPath
+            if let customSetter = field.customSetter {
+
+                return customSetter(PartialObject<O>(rawObject), newValue)
+            }
+            return rawObject.setValue(newValue, forKey: keyPath)
+        }
+
+
+        // MARK: FieldAttributeProtocol
+
+        internal let entityDescriptionValues: () -> FieldAttributeProtocol.EntityDescriptionValues
+
+        internal var getter: CoreStoreManagedObject.CustomGetter? {
+
+            guard let customGetter = self.customGetter else {
+
+                return nil
+            }
+            let keyPath = self.keyPath
+            return { (_ id: Any) -> Any? in
+
+                let rawObject = id as! CoreStoreManagedObject
+                rawObject.willAccessValue(forKey: keyPath)
+                defer {
+
+                    rawObject.didAccessValue(forKey: keyPath)
+                }
+                return customGetter(PartialObject<O>(rawObject))
+            }
+        }
+
+        internal var setter: CoreStoreManagedObject.CustomSetter? {
+
+            guard let customSetter = self.customSetter else {
+
+                return nil
+            }
+            let keyPath = self.keyPath
+            return { (_ id: Any, _ newValue: Any?) -> Void in
+
+                let rawObject = id as! CoreStoreManagedObject
+                rawObject.willChangeValue(forKey: keyPath)
+                defer {
+
+                    rawObject.didChangeValue(forKey: keyPath)
+                }
+                return customSetter(PartialObject<O>(rawObject), newValue as! V)
+            }
+        }
+
+
+        // MARK: FilePrivate
+
+        fileprivate init(
+            keyPath: KeyPathString,
+            isOptional: Bool,
+            renamingIdentifier: @escaping () -> String?,
+            customGetter: ((_ partialObject: PartialObject<O>) -> V)?,
+            customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? ,
+            affectedByKeyPaths: @escaping () -> Set<KeyPathString>) {
+
+            self.keyPath = keyPath
+            self.entityDescriptionValues = {
+                (
+                    attributeType: .undefinedAttributeType,
+                    isOptional: isOptional,
+                    isTransient: true,
+                    allowsExternalBinaryDataStorage: false,
+                    versionHashModifier: nil,
+                    renamingIdentifier: renamingIdentifier(),
+                    affectedByKeyPaths: affectedByKeyPaths(),
+                    defaultValue: nil
+                )
+            }
+            self.customGetter = customGetter
+            self.customSetter = customSetter
+        }
+
+
+        // MARK: Private
+
+        private let customGetter: ((_ partialObject: PartialObject<O>) -> V)?
+        private let customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)?
+    }
+}

Sources/Field.PlistCoded.swift

@@ -0,0 +1,9 @@
+//
+//  Field.PlistCoded.swift
+//  CoreStore
+//
+//  Created by John Estropia on 2020/01/15.
+//  Copyright © 2020 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation

Sources/Field.Stored.swift

@@ -0,0 +1,362 @@
+//
+//  Field.Stored.swift
+//  CoreStore
+//
+//  Copyright © 2020 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 CoreData
+import Foundation
+
+
+// MARK: - FieldContainer
+
+extension FieldContainer {
+
+    // MARK: - Stored
+
+    /**
+     The containing type for stored property values. Any type that conforms to `FieldStorableType` are supported.
+     ```
+     class Animal: CoreStoreObject {
+         @Field.Stored("species")
+         var species = ""
+
+         @Field.Computed("pluralName", customGetter: Animal.pluralName(_:))
+         var pluralName: String = ""
+
+         @Field.PlistCoded("color")
+         var color: UIColor?
+     }
+     ```
+     - Important: `Field` properties are required to be used as `@propertyWrapper`s. Any other declaration not using the `@Field.Stored(...) var` syntax will be ignored.     
+     */
+    @propertyWrapper
+    public struct Stored<V: FieldStorableType>: AttributeKeyPathStringConvertible, FieldAttributeProtocol {
+
+        /**
+         Initializes the metadata for the property.
+         ```
+         class Person: CoreStoreObject {
+             @Field.Stored("title")
+             var title: String = "Mr."
+
+             @Field.Stored("name")
+             var name: String = ""
+
+             @Field.Computed("displayName", customGetter: Person.getName(_:))
+             var displayName: String = ""
+
+             private static func getName(_ partialObject: PartialObject<Person>) -> String {
+                 let cachedDisplayName = partialObject.primitiveValue(for: \.$displayName)
+                 if !cachedDisplayName.isEmpty {
+                     return cachedDisplayName
+                 }
+                 let title = partialObject.value(for: \.$title)
+                 let name = partialObject.value(for: \.$name)
+                 let displayName = "\(title) \(name)"
+                 partialObject.setPrimitiveValue(displayName, for: { $0.displayName })
+                 return displayName
+             }
+         }
+         ```
+         - parameter initial: the initial value for the property when the object is first create
+         - parameter keyPath: the permanent attribute name for this property.
+         - parameter versionHashModifier: used to mark or denote a property as being a different "version" than another even if all of the values which affect persistence are equal. (Such a difference is important in cases where the properties are unchanged but the format or content of its data are changed.)
+         - parameter renamingIdentifier: used to resolve naming conflicts between models. When creating an entity mapping between entities in two managed object models, a source entity property and a destination entity property that share the same identifier indicate that a property mapping should be configured to migrate from the source to the destination. If unset, the identifier will be the property's name.
+         - parameter customGetter: use this closure as an "override" for the default property getter. The closure receives a `PartialObject<O>`, which acts as a fast, type-safe KVC interface for `CoreStoreObject`. The reason a `CoreStoreObject` instance is not passed directly is because the Core Data runtime is not aware of `CoreStoreObject` properties' static typing, and so loading those info everytime KVO invokes this accessor method incurs a cumulative performance hit (especially in KVO-heavy operations such as `ListMonitor` observing.) When accessing the property value from `PartialObject<O>`, make sure to use `PartialObject<O>.primitiveValue(for:)` instead of `PartialObject<O>.value(for:)`, which would unintentionally execute the same closure again recursively.
+         - parameter customSetter: use this closure as an "override" for the default property setter. The closure receives a `PartialObject<O>`, which acts as a fast, type-safe KVC interface for `CoreStoreObject`. The reason a `CoreStoreObject` instance is not passed directly is because the Core Data runtime is not aware of `CoreStoreObject` properties' static typing, and so loading those info everytime KVO invokes this accessor method incurs a cumulative performance hit (especially in KVO-heavy operations such as `ListMonitor` observing.) When accessing the property value from `PartialObject<O>`, make sure to use `PartialObject<O>.setPrimitiveValue(_:for:)` instead of `PartialObject<O>.setValue(_:for:)`, which would unintentionally execute the same closure again recursively.
+         - parameter affectedByKeyPaths: a set of key paths for properties whose values affect the value of the receiver. This is similar to `NSManagedObject.keyPathsForValuesAffectingValue(forKey:)`.
+         */
+        public init(
+            wrappedValue initial: @autoclosure @escaping () -> V,
+            _ keyPath: KeyPathString,
+            versionHashModifier: @autoclosure @escaping () -> String? = nil,
+            renamingIdentifier: @autoclosure @escaping () -> String? = nil,
+            customGetter: ((_ partialObject: PartialObject<O>) -> V)? = nil,
+            customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? = nil,
+            affectedByKeyPaths: @autoclosure @escaping () -> Set<KeyPathString> = []) {
+
+            self.init(
+                wrappedValue: initial,
+                keyPath: keyPath,
+                isOptional: false,
+                versionHashModifier: versionHashModifier,
+                renamingIdentifier: renamingIdentifier,
+                customGetter: customGetter,
+                customSetter: customSetter,
+                affectedByKeyPaths: affectedByKeyPaths
+            )
+        }
+
+
+        // MARK: @propertyWrapper
+
+        @available(*, unavailable)
+        public var wrappedValue: V {
+
+            get { fatalError() }
+            set { fatalError() }
+        }
+
+        public var projectedValue: Self {
+
+            return self
+        }
+
+        public static subscript(
+            _enclosingInstance instance: O,
+            wrapped wrappedKeyPath: ReferenceWritableKeyPath<O, V>,
+            storage storageKeyPath: ReferenceWritableKeyPath<O, Self>
+        ) -> V {
+
+            get {
+
+                Internals.assert(
+                    instance.rawObject != nil,
+                    "Attempted to access values from a \(Internals.typeName(O.self)) meta object. Meta objects are only used for querying keyPaths and infering types."
+                )
+                return self.read(field: instance[keyPath: storageKeyPath], for: instance.rawObject!) as! V
+            }
+            set {
+
+                Internals.assert(
+                    instance.rawObject != nil,
+                    "Attempted to access values from a \(Internals.typeName(O.self)) meta object. Meta objects are only used for querying keyPaths and infering types."
+                )
+                return self.modify(field: instance[keyPath: storageKeyPath], for: instance.rawObject!, newValue: newValue)
+            }
+        }
+
+
+        // MARK: AnyKeyPathStringConvertible
+
+        public var cs_keyPathString: String {
+
+            return self.keyPath
+        }
+
+
+        // MARK: KeyPathStringConvertible
+
+        public typealias ObjectType = O
+        public typealias DestinationValueType = V
+
+
+        // MARK: AttributeKeyPathStringConvertible
+
+        public typealias ReturnValueType = DestinationValueType
+
+
+        // MARK: PropertyProtocol
+
+        internal let keyPath: KeyPathString
+
+
+        // MARK: FieldProtocol
+
+        internal static func read(field: FieldProtocol, for rawObject: CoreStoreManagedObject) -> Any? {
+
+            Internals.assert(
+                rawObject.isRunningInAllowedQueue() == true,
+                "Attempted to access \(Internals.typeName(O.self))'s value outside it's designated queue."
+            )
+            let field = field as! Self
+            if let customGetter = field.customGetter {
+
+                return customGetter(PartialObject<O>(rawObject))
+            }
+            let keyPath = field.keyPath
+            guard case let rawValue as V.FieldStoredNativeType = rawObject.value(forKey: keyPath) else {
+
+                return nil
+            }
+            return V.cs_fromFieldStoredNativeType(rawValue)
+        }
+
+        internal static func modify(field: FieldProtocol, for rawObject: CoreStoreManagedObject, newValue: Any?) {
+
+            Internals.assert(
+                rawObject.isRunningInAllowedQueue() == true,
+                "Attempted to access \(Internals.typeName(O.self))'s value outside it's designated queue."
+            )
+            Internals.assert(
+                rawObject.isEditableInContext() == true,
+                "Attempted to update a \(Internals.typeName(O.self))'s value from outside a transaction."
+            )
+            let newValue = newValue as! V
+            let field = field as! Self
+            let keyPath = field.keyPath
+            if let customSetter = field.customSetter {
+
+                return customSetter(PartialObject<O>(rawObject), newValue)
+            }
+            return rawObject.setValue(
+                newValue.cs_toFieldStoredNativeType(),
+                forKey: keyPath
+            )
+        }
+
+
+        // MARK: FieldAttributeProtocol
+
+        internal let entityDescriptionValues: () -> FieldAttributeProtocol.EntityDescriptionValues
+
+        internal var getter: CoreStoreManagedObject.CustomGetter? {
+
+            guard let customGetter = self.customGetter else {
+
+                return nil
+            }
+            let keyPath = self.keyPath
+            return { (_ id: Any) -> Any? in
+
+                let rawObject = id as! CoreStoreManagedObject
+                rawObject.willAccessValue(forKey: keyPath)
+                defer {
+
+                    rawObject.didAccessValue(forKey: keyPath)
+                }
+                let value = customGetter(PartialObject<O>(rawObject))
+                return value.cs_toFieldStoredNativeType()
+            }
+        }
+
+        internal var setter: CoreStoreManagedObject.CustomSetter? {
+
+            guard let customSetter = self.customSetter else {
+
+                return nil
+            }
+            let keyPath = self.keyPath
+            return { (_ id: Any, _ newValue: Any?) -> Void in
+
+                let rawObject = id as! CoreStoreManagedObject
+                rawObject.willChangeValue(forKey: keyPath)
+                defer {
+
+                    rawObject.didChangeValue(forKey: keyPath)
+                }
+                customSetter(
+                    PartialObject<O>(rawObject),
+                    V.cs_fromFieldStoredNativeType(newValue as! V.FieldStoredNativeType)
+                )
+            }
+        }
+
+
+        // MARK: FilePrivate
+
+        fileprivate init(
+            wrappedValue initial: @escaping () -> V,
+            keyPath: KeyPathString,
+            isOptional: Bool,
+            versionHashModifier: @escaping () -> String?,
+            renamingIdentifier: @escaping () -> String?,
+            customGetter: ((_ partialObject: PartialObject<O>) -> V)?,
+            customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? ,
+            affectedByKeyPaths: @escaping () -> Set<KeyPathString>) {
+
+            self.keyPath = keyPath
+            self.entityDescriptionValues = {
+                (
+                    attributeType: V.cs_rawAttributeType,
+                    isOptional: isOptional,
+                    isTransient: false,
+                    allowsExternalBinaryDataStorage: false,
+                    versionHashModifier: versionHashModifier(),
+                    renamingIdentifier: renamingIdentifier(),
+                    affectedByKeyPaths: affectedByKeyPaths(),
+                    defaultValue: initial().cs_toFieldStoredNativeType()
+                )
+            }
+            self.customGetter = customGetter
+            self.customSetter = customSetter
+        }
+
+
+        // MARK: Private
+
+        private let customGetter: ((_ partialObject: PartialObject<O>) -> V)?
+        private let customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)?
+    }
+}
+
+
+// MARK: - FieldContainer.Stored where V: FieldOptionalType
+
+extension FieldContainer.Stored where V: FieldOptionalType {
+
+    /**
+     Initializes the metadata for the property.
+     ```
+     class Person: CoreStoreObject {
+         @Field.Stored("title")
+         var title: String = "Mr."
+
+         @Field.Stored("name")
+         var name: String = ""
+
+         @Field.Computed("displayName", customGetter: Person.getName(_:))
+         var displayName: String = ""
+
+         private static func getName(_ partialObject: PartialObject<Person>) -> String {
+             let cachedDisplayName = partialObject.primitiveValue(for: \.$displayName)
+             if !cachedDisplayName.isEmpty {
+                 return cachedDisplayName
+             }
+             let title = partialObject.value(for: \.$title)
+             let name = partialObject.value(for: \.$name)
+             let displayName = "\(title) \(name)"
+             partialObject.setPrimitiveValue(displayName, for: { $0.displayName })
+             return displayName
+         }
+     }
+     ```
+     - parameter initial: the initial value for the property when the object is first create
+     - parameter keyPath: the permanent attribute name for this property.
+     - parameter versionHashModifier: used to mark or denote a property as being a different "version" than another even if all of the values which affect persistence are equal. (Such a difference is important in cases where the properties are unchanged but the format or content of its data are changed.)
+     - parameter renamingIdentifier: used to resolve naming conflicts between models. When creating an entity mapping between entities in two managed object models, a source entity property and a destination entity property that share the same identifier indicate that a property mapping should be configured to migrate from the source to the destination. If unset, the identifier will be the property's name.
+     - parameter customGetter: use this closure as an "override" for the default property getter. The closure receives a `PartialObject<O>`, which acts as a fast, type-safe KVC interface for `CoreStoreObject`. The reason a `CoreStoreObject` instance is not passed directly is because the Core Data runtime is not aware of `CoreStoreObject` properties' static typing, and so loading those info everytime KVO invokes this accessor method incurs a cumulative performance hit (especially in KVO-heavy operations such as `ListMonitor` observing.) When accessing the property value from `PartialObject<O>`, make sure to use `PartialObject<O>.primitiveValue(for:)` instead of `PartialObject<O>.value(for:)`, which would unintentionally execute the same closure again recursively.
+     - parameter customSetter: use this closure as an "override" for the default property setter. The closure receives a `PartialObject<O>`, which acts as a fast, type-safe KVC interface for `CoreStoreObject`. The reason a `CoreStoreObject` instance is not passed directly is because the Core Data runtime is not aware of `CoreStoreObject` properties' static typing, and so loading those info everytime KVO invokes this accessor method incurs a cumulative performance hit (especially in KVO-heavy operations such as `ListMonitor` observing.) When accessing the property value from `PartialObject<O>`, make sure to use `PartialObject<O>.setPrimitiveValue(_:for:)` instead of `PartialObject<O>.setValue(_:for:)`, which would unintentionally execute the same closure again recursively.
+     - parameter affectedByKeyPaths: a set of key paths for properties whose values affect the value of the receiver. This is similar to `NSManagedObject.keyPathsForValuesAffectingValue(forKey:)`.
+     */
+    public init(
+        wrappedValue initial: @autoclosure @escaping () -> V = nil,
+        _ keyPath: KeyPathString,
+        versionHashModifier: @autoclosure @escaping () -> String? = nil,
+        renamingIdentifier: @autoclosure @escaping () -> String? = nil,
+        customGetter: ((_ partialObject: PartialObject<O>) -> V)? = nil,
+        customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? = nil,
+        affectedByKeyPaths: @autoclosure @escaping () -> Set<KeyPathString> = []) {
+
+        self.init(
+            wrappedValue: initial,
+            keyPath: keyPath,
+            isOptional: true,
+            versionHashModifier: versionHashModifier,
+            renamingIdentifier: renamingIdentifier,
+            customGetter: customGetter,
+            customSetter: customSetter,
+            affectedByKeyPaths: affectedByKeyPaths
+        )
+    }
+}

Sources/Field.swift

@@ -0,0 +1,71 @@
+//
+//  Field.swift
+//  CoreStore
+//
+//  Copyright © 2020 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 CoreData
+import Foundation
+
+
+// MARK: - DynamicObject
+
+extension DynamicObject where Self: CoreStoreObject {
+
+    /**
+     The containing type for value propertiess. `Field` properties support any type that conforms to `ImportableAttributeType`.
+     ```
+     class Animal: CoreStoreObject {
+         @Field.Stored("species")
+         var species = ""
+
+         @Field.Stored("nickname")
+         var nickname: String?
+
+         @Field.PlistCoded("color")
+         var color: UIColor?
+     }
+     ```
+     - Important: `Field` properties are required to be used as `@propertyWrapper`s. Any other declaration not using the `@Field.*(...) var` syntax will be ignored.
+     */
+    public typealias Field = FieldContainer<Self>
+}
+
+
+// MARK: - FieldContainer
+
+/**
+ The containing type for value properties. Use the `DynamicObject.Field` typealias instead for shorter syntax.
+ ```
+ class Animal: CoreStoreObject {
+     @Field.Stored("species")
+     var species = ""
+
+     @Field.Stored("nickname")
+     var nickname: String?
+
+     @Field.PlistCoded("color")
+     var color: UIColor?
+ }
+ ```
+ */
+public enum FieldContainer<O: CoreStoreObject> {}

Sources/FieldOptionalType.swift

@@ -0,0 +1,56 @@
+//
+//  FieldOptionalType.swift
+//  CoreStore
+//
+//  Copyright © 2020 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
+
+
+// MARK: - FieldOptionalType
+
+public protocol FieldOptionalType: ExpressibleByNilLiteral {
+
+    /**
+     The type for the wrapped value
+     */
+    associatedtype Wrapped
+
+    /**
+     The wrapped value
+     */
+    var cs_wrappedValue: Wrapped? { get }
+}
+
+
+// MARK: - Optional: FieldOptionalType
+
+extension Optional: FieldOptionalType {
+
+    // MARK: Public
+    
+    @inlinable
+    public var cs_wrappedValue: Wrapped? {
+
+        return self
+    }
+}

Sources/FieldProtocol.swift

@@ -0,0 +1,57 @@
+//
+//  FieldProtocol.swift
+//  CoreStore
+//
+//  Copyright © 2020 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: - FieldProtocol
+
+internal protocol FieldProtocol: PropertyProtocol {
+    
+    static func read(field: FieldProtocol, for rawObject: CoreStoreManagedObject) -> Any?
+    static func modify(field: FieldProtocol, for rawObject: CoreStoreManagedObject, newValue: Any?)
+}
+
+
+// MARK: - FieldAttributeProtocol
+
+internal protocol FieldAttributeProtocol: FieldProtocol {
+
+    typealias EntityDescriptionValues = (
+        attributeType: NSAttributeType,
+        isOptional: Bool,
+        isTransient: Bool,
+        allowsExternalBinaryDataStorage: Bool,
+        versionHashModifier: String?,
+        renamingIdentifier: String?,
+        affectedByKeyPaths: Set<KeyPathString>,
+        defaultValue: Any?
+    )
+
+    var entityDescriptionValues: () -> EntityDescriptionValues { get }
+    var getter: CoreStoreManagedObject.CustomGetter? { get }
+    var setter: CoreStoreManagedObject.CustomSetter? { get }
+}

Sources/FieldStorableType.swift

@@ -0,0 +1,259 @@
+//
+//  FieldStorableType.swift
+//  CoreStore
+//
+//  Copyright © 2020 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 CoreData
+import Foundation
+import CoreGraphics
+
+
+// MARK: - FieldStorableType
+
+public protocol FieldStorableType {
+
+    /**
+     The `NSAttributeType` for this type
+     */
+    associatedtype FieldStoredNativeType
+
+    /**
+     The `NSAttributeType` for this type
+     */
+    static var cs_rawAttributeType: NSAttributeType { get }
+
+    /**
+     Creates an instance of this type from raw native value.
+     */
+    @inline(__always)
+    static func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self
+
+    /**
+     Creates `FieldStoredNativeType` value from this instance.
+     */
+    @inline(__always)
+    func cs_toFieldStoredNativeType() -> Any?
+}
+
+
+// MARK: - FieldStorableType where Self: ImportableAttributeType, FieldStoredNativeType == QueryableNativeType
+
+extension FieldStorableType where Self: ImportableAttributeType, FieldStoredNativeType == QueryableNativeType {
+
+    @inline(__always)
+    public static func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self {
+
+        return self.cs_fromQueryableNativeType(value)!
+    }
+
+    @inline(__always)
+    public func cs_toFieldStoredNativeType() -> Any? {
+
+        return self.cs_toQueryableNativeType()
+    }
+}
+
+
+// MARK: - Bool
+
+extension Bool: FieldStorableType {}
+
+
+// MARK: - CGFloat
+
+extension CGFloat: FieldStorableType {}
+
+
+// MARK: - Data
+
+extension Data: FieldStorableType {}
+
+
+// MARK: - Date
+
+extension Date: FieldStorableType {}
+
+
+// MARK: - Double
+
+extension Double: FieldStorableType {}
+
+
+// MARK: - Float
+
+extension Float: FieldStorableType {}
+
+
+// MARK: - Int
+
+extension Int: FieldStorableType {}
+
+
+// MARK: - Int8
+
+extension Int8: FieldStorableType {}
+
+
+// MARK: - Int16
+
+extension Int16: FieldStorableType {}
+
+
+// MARK: - Int32
+
+extension Int32: FieldStorableType {}
+
+
+// MARK: - Int64
+
+extension Int64: FieldStorableType {}
+
+
+// MARK: - NSData
+
+extension NSData: FieldStorableType {
+
+    @nonobjc @inline(__always)
+    public class func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self {
+
+        return self.cs_fromQueryableNativeType(value)!
+    }
+}
+
+
+// MARK: - NSDate
+
+extension NSDate: FieldStorableType {
+
+    @nonobjc @inline(__always)
+    public class func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self {
+
+        return self.cs_fromQueryableNativeType(value)!
+    }
+}
+
+
+// MARK: - NSNumber
+
+extension NSNumber: FieldStorableType {
+
+    @nonobjc @inline(__always)
+    public class func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self {
+
+        return self.cs_fromQueryableNativeType(value)!
+    }
+}
+
+
+// MARK: - NSString
+
+extension NSString: FieldStorableType {
+
+    @nonobjc @inline(__always)
+    public class func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self {
+
+        return self.cs_fromQueryableNativeType(value)!
+    }
+}
+
+
+// MARK: - NSURL
+
+extension NSURL: FieldStorableType {
+
+    @nonobjc @inline(__always)
+    public class func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self {
+
+        return self.cs_fromQueryableNativeType(value)!
+    }
+}
+
+
+// MARK: - NSUUID
+
+extension NSUUID: FieldStorableType {
+
+    @nonobjc @inline(__always)
+    public class func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self {
+
+        return self.cs_fromQueryableNativeType(value)!
+    }
+}
+
+
+// MARK: - String
+
+extension String: FieldStorableType {}
+
+
+// MARK: - URL
+
+extension URL: FieldStorableType {}
+
+
+// MARK: - UUID
+
+extension UUID: FieldStorableType {}
+
+
+// MARK: - Optional<FieldStorableType>
+
+extension Optional: FieldStorableType where Wrapped: FieldStorableType {
+
+    // MARK: FieldStorableType
+
+    public typealias FieldStoredNativeType = Wrapped.FieldStoredNativeType?
+
+    public static var cs_rawAttributeType: NSAttributeType {
+
+        return Wrapped.cs_rawAttributeType
+    }
+
+    @inline(__always)
+    public static func cs_fromFieldStoredNativeType(_ value: FieldStoredNativeType) -> Self {
+
+        switch value {
+
+        case nil,
+             is NSNull:
+            return nil
+
+        case let value?:
+            return Wrapped.cs_fromFieldStoredNativeType(value)
+        }
+    }
+
+    @inline(__always)
+    public func cs_toFieldStoredNativeType() -> Any? {
+
+        switch self {
+
+        case nil,
+             is NSNull:
+            return nil
+
+        case let value?:
+            return value.cs_toFieldStoredNativeType()
+        }
+    }
+}

Sources/KeyPath+Querying.swift

@@ -359,6 +359,20 @@ public func ~= <O: NSManagedObject, D: NSManagedObject, S: Sequence>(_ sequence:
 }
 
 
+// MARK: - KeyPath where Root: CoreStoreObject, Value: FieldContainer<Root>.Stored<QueryableAttributeType & Equatable>
+
+/**
+ Creates a `Where` clause by comparing if a property is equal to a value
+ ```
+ let person = dataStack.fetchOne(From<Person>().where(\.nickname == "John"))
+ ```
+ */
+public func == <O, V>(_ keyPath: KeyPath<O, FieldContainer<O>.Stored<V>>, _ value: V) -> Where<O> {
+
+    return Where<O>(keyPath, isEqualTo: value)
+}
+
+
 // MARK: - KeyPath where Root: CoreStoreObject, Value: ValueContainer<Root>.Required<QueryableAttributeType & Equatable>
 
 /**

Sources/KeyPathGenericBindings.swift

@@ -106,47 +106,47 @@ extension Int64: AllowedObjectiveCKeyPathValue {
 
 extension NSData: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSData
 }
 
 extension NSDate: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSDate
 }
 
 extension NSManagedObject: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSManagedObject
 }
 
 extension NSNumber: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSNumber
 }
 
 extension NSString: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSString
 }
 
 extension NSSet: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSSet
 }
 
 extension NSOrderedSet: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSOrderedSet
 }
 
 extension NSURL: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSURL
 }
 
 extension NSUUID: AllowedOptionalObjectiveCKeyPathValue {
 
-    public typealias DestinationValueType = Self
+    public typealias DestinationValueType = NSUUID
 }
 
 extension String: AllowedOptionalObjectiveCKeyPathValue {
@@ -240,32 +240,32 @@ extension Int64: AllowedObjectiveCAttributeKeyPathValue {
 
 extension NSData: AllowedObjectiveCAttributeKeyPathValue {
 
-    public typealias ReturnValueType = Self
+    public typealias ReturnValueType = NSData
 }
 
 extension NSDate: AllowedObjectiveCAttributeKeyPathValue {
 
-    public typealias ReturnValueType = Self
+    public typealias ReturnValueType = NSDate
 }
 
 extension NSNumber: AllowedObjectiveCAttributeKeyPathValue {
 
-    public typealias ReturnValueType = Self
+    public typealias ReturnValueType = NSNumber
 }
 
 extension NSString: AllowedObjectiveCAttributeKeyPathValue {
 
-    public typealias ReturnValueType = Self
+    public typealias ReturnValueType = NSString
 }
 
 extension NSURL: AllowedObjectiveCAttributeKeyPathValue {
 
-    public typealias ReturnValueType = Self
+    public typealias ReturnValueType = NSURL
 }
 
 extension NSUUID: AllowedObjectiveCAttributeKeyPathValue {
 
-    public typealias ReturnValueType = Self
+    public typealias ReturnValueType = NSUUID
 }
 
 extension String: AllowedObjectiveCAttributeKeyPathValue {

Sources/ObjectPublisher.swift

@@ -367,6 +367,36 @@ extension ObjectPublisher where O: CoreStoreObject {
 
     // MARK: Public
 
+    /**
+     Returns the value for the property identified by a given key.
+     */
+    public subscript<OBase, V>(dynamicMember member: KeyPath<O, FieldContainer<OBase>.Stored<V>>) -> V? {
+
+        guard
+            let object = self.object,
+            let rawObject = object.rawObject
+            else {
+
+                return nil
+        }
+        return FieldContainer<OBase>.Stored<V>.read(field: object[keyPath: member], for: rawObject) as! V?
+    }
+
+    /**
+     Returns the value for the property identified by a given key.
+     */
+    public subscript<OBase, V>(dynamicMember member: KeyPath<O, FieldContainer<OBase>.Computed<V>>) -> V? {
+
+        guard
+            let object = self.object,
+            let rawObject = object.rawObject
+            else {
+
+                return nil
+        }
+        return FieldContainer<OBase>.Computed<V>.read(field: object[keyPath: member], for: rawObject) as! V?
+    }
+
     /**
      Returns the value for the property identified by a given key.
      */

Sources/ObjectSnapshot.swift

@@ -175,6 +175,40 @@ extension ObjectSnapshot where O: NSManagedObject {
 
 extension ObjectSnapshot where O: CoreStoreObject {
 
+    /**
+     Returns the value for the property identified by a given key.
+     */
+    public subscript<OBase, V>(dynamicMember member: KeyPath<O, FieldContainer<OBase>.Stored<V>>) -> V {
+
+        get {
+
+            let key = String(keyPath: member)
+            return self.values[key] as! V
+        }
+        set {
+
+            let key = String(keyPath: member)
+            self.values[key] = newValue
+        }
+    }
+
+    /**
+     Returns the value for the property identified by a given key.
+     */
+    public subscript<OBase, V>(dynamicMember member: KeyPath<O, FieldContainer<OBase>.Computed<V>>) -> V {
+
+        get {
+
+            let key = String(keyPath: member)
+            return self.values[key] as! V
+        }
+        set {
+
+            let key = String(keyPath: member)
+            self.values[key] = newValue
+        }
+    }
+
     /**
      Returns the value for the property identified by a given key.
      */

Sources/PartialObject.swift

@@ -43,6 +43,89 @@ public struct PartialObject<O: CoreStoreObject> {
     }
 
 
+    // MARK: Field.Stored accessors/mutators
+
+    /**
+     Returns the value for the property identified by a given key.
+     */
+    public func value<V>(for property: (O) -> FieldContainer<O>.Stored<V>) -> V {
+
+        return V.cs_fromFieldStoredNativeType(
+            self.rawObject.value(forKey: property(O.meta).keyPath) as! V.FieldStoredNativeType
+        )
+    }
+
+    /**
+     Returns the value for the property identified by a given key.
+     */
+    public func value<V>(for property: (O) -> FieldContainer<O>.Computed<V>) -> V {
+
+        switch self.rawObject.value(forKey: property(O.meta).keyPath) {
+
+        case let value as V:
+            return value
+
+        default:
+            return nil as Any? as! V // filter NSNull
+        }
+    }
+
+    /**
+     Returns the value for the specified property from the managed object’s private internal storage.
+
+     This method does not invoke the access notification methods (`willAccessValue(forKey:)` and `didAccessValue(forKey:)`). This method is used primarily by subclasses that implement custom accessor methods that need direct access to the receiver’s private storage.
+     */
+    public func primitiveValue<V>(for property: (O) -> FieldContainer<O>.Stored<V>) -> V {
+
+        return V.cs_fromFieldStoredNativeType(
+            self.rawObject.primitiveValue(forKey: property(O.meta).keyPath) as! V.FieldStoredNativeType
+        )
+    }
+
+    /**
+     Returns the value for the specified property from the managed object’s private internal storage.
+
+     This method does not invoke the access notification methods (`willAccessValue(forKey:)` and `didAccessValue(forKey:)`). This method is used primarily by subclasses that implement custom accessor methods that need direct access to the receiver’s private storage.
+     */
+    public func primitiveValue<V>(for property: (O) -> FieldContainer<O>.Computed<V>) -> V {
+
+        switch self.rawObject.primitiveValue(forKey: property(O.meta).keyPath) {
+
+        case let value as V:
+            return value
+
+        default:
+            return nil as Any? as! V // filter NSNull
+        }
+    }
+
+    /**
+     Sets in the object's private internal storage the value of a given property.
+
+     Sets in the receiver’s private internal storage the value of the property specified by key to value.
+     */
+    public func setPrimitiveValue<V>(_ value: V, for property: (O) -> FieldContainer<O>.Stored<V>) {
+
+        self.rawObject.setPrimitiveValue(
+            value.cs_toFieldStoredNativeType(),
+            forKey: property(O.meta).keyPath
+        )
+    }
+
+    /**
+     Sets in the object's private internal storage the value of a given property.
+
+     Sets in the receiver’s private internal storage the value of the property specified by key to value.
+     */
+    public func setPrimitiveValue<V>(_ value: V, for property: (O) -> FieldContainer<O>.Computed<V>) {
+
+        self.rawObject.setPrimitiveValue(
+            value,
+            forKey: property(O.meta).keyPath
+        )
+    }
+    
+    
     // MARK: Value.Required accessors/mutators
     
     /**

Sources/PropertyProtocol.swift

@@ -29,7 +29,7 @@ import CoreData
 
 // MARK: - PropertyProtocol
 
-internal protocol PropertyProtocol: AnyObject {
+internal protocol PropertyProtocol {
 
     var keyPath: KeyPathString { get }
 }

Sources/RelationshipProtocol.swift

@@ -29,7 +29,7 @@ import CoreData
 
 // MARK: - RelationshipProtocol
 
-internal protocol RelationshipProtocol: PropertyProtocol {
+internal protocol RelationshipProtocol: AnyObject, PropertyProtocol {
 
     typealias EntityDescriptionValues = (
         isToMany: Bool,

Sources/StorageInterface.swift

@@ -73,22 +73,22 @@ public struct LocalStorageOptions: OptionSet, ExpressibleByNilLiteral {
     /**
      Tells the `DataStack` that the store should not be migrated or recreated, and should simply fail on model mismatch
      */
-    public static let none = LocalStorageOptions(rawValue: 0)
+    public static let none: LocalStorageOptions = []
     
     /**
      Tells the `DataStack` to delete and recreate the store on model mismatch, otherwise exceptions will be thrown on failure instead
      */
-    public static let recreateStoreOnModelMismatch = LocalStorageOptions(rawValue: 1 << 0)
+    public static let recreateStoreOnModelMismatch: LocalStorageOptions = .init(rawValue: 1 << 0)
     
     /**
      Tells the `DataStack` to prevent progressive migrations for the store
      */
-    public static let preventProgressiveMigration = LocalStorageOptions(rawValue: 1 << 1)
+    public static let preventProgressiveMigration: LocalStorageOptions = .init(rawValue: 1 << 1)
     
     /**
      Tells the `DataStack` to allow lightweight migration for the store when added synchronously
      */
-    public static let allowSynchronousLightweightMigration = LocalStorageOptions(rawValue: 1 << 2)
+    public static let allowSynchronousLightweightMigration: LocalStorageOptions = .init(rawValue: 1 << 2)
     
     
     

Sources/VersionLock.swift

@@ -111,12 +111,7 @@ public struct VersionLock: ExpressibleByDictionaryLiteral, Equatable {
         var hashesByEntityName: [EntityName: Data] = [:]
         for (entityName, intArray) in keyValues {
 
-            hashesByEntityName[entityName] = Data(
+            hashesByEntityName[entityName] = intArray.withUnsafeBufferPointer(Data.init(buffer:))
-                buffer: UnsafeBufferPointer(
-                    start: intArray,
-                    count: intArray.count
-                )
-            )
         }
         self.hashesByEntityName = hashesByEntityName
     }

Sources/Where.swift

@@ -181,6 +181,26 @@ public struct Where<O: DynamicObject>: WhereClauseType, FetchClause, QueryClause
      - parameter keyPath: the keyPath to compare with
      - parameter value: the arguments for the `==` operator
      */
+    public init<V: FieldStorableType>(_ keyPath: KeyPathString, isEqualTo value: V) {
+
+        switch value {
+
+        case nil,
+             is NSNull:
+            self.init(NSPredicate(format: "\(keyPath) == nil"))
+
+        case let value:
+            self.init(NSPredicate(format: "\(keyPath) == %@", argumentArray: [value.cs_toFieldStoredNativeType() as Any]))
+        }
+    }
+
+    /**
+     Initializes a `Where` clause that compares equality
+
+     - parameter keyPath: the keyPath to compare with
+     - parameter value: the arguments for the `==` operator
+     */
+    @_disfavoredOverload
     public init<U: QueryableAttributeType>(_ keyPath: KeyPathString, isEqualTo value: U?) {
 
         switch value {
@@ -229,6 +249,18 @@ public struct Where<O: DynamicObject>: WhereClauseType, FetchClause, QueryClause
      - parameter keyPath: the keyPath to compare with
      - parameter list: the sequence to check membership of
      */
+    public init<S: Sequence>(_ keyPath: KeyPathString, isMemberOf list: S) where S.Iterator.Element: FieldStorableType {
+
+        self.init(NSPredicate(format: "\(keyPath) IN %@", list.map({ $0.cs_toFieldStoredNativeType() }) as NSArray))
+    }
+    
+    /**
+     Initializes a `Where` clause that compares membership
+     
+     - parameter keyPath: the keyPath to compare with
+     - parameter list: the sequence to check membership of
+     */
+    @_disfavoredOverload
     public init<S: Sequence>(_ keyPath: KeyPathString, isMemberOf list: S) where S.Iterator.Element: QueryableAttributeType {
         
         self.init(NSPredicate(format: "\(keyPath) IN %@", list.map({ $0.cs_toQueryableNativeType() }) as NSArray))
@@ -409,6 +441,17 @@ extension Where where O: NSManagedObject {
 
 extension Where where O: CoreStoreObject {
 
+    /**
+     Initializes a `Where` clause that compares equality
+
+     - parameter keyPath: the keyPath to compare with
+     - parameter value: the arguments for the `==` operator
+     */
+    public init<V>(_ keyPath: KeyPath<O, FieldContainer<O>.Stored<V>>, isEqualTo value: V) {
+
+        self.init(O.meta[keyPath: keyPath].keyPath, isEqualTo: value)
+    }
+    
     /**
      Initializes a `Where` clause that compares equality to `nil`