WIP: demo

Demo/Demo.xcodeproj/project.pbxproj

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@@ -496,9 +511,11 @@
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 				B5A543FA2504840E000DC5E3 /* Advanced.EvolutionDemo.swift */,
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 				B5A54400250487C7000DC5E3 /* Advanced.EvolutionDemo.ListView.swift */,
 				B5A54402250487D4000DC5E3 /* Advanced.EvolutionDemo.ItemView.swift */,
+				B5D6F208250E14AA00DF5D2F /* Advanced.EvolutionDemo.Migrator.swift */,
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 			path = EvolutionDemo;
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-				B5A5440825049489000DC5E3 /* Advanced.EvolutionDemo.CreatureV2.swift */,
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-				B5A5440A25049492000DC5E3 /* Advanced.EvolutionDemo.CreatureV3.swift */,
+				B5D6F1FA250E0AE000DF5D2F /* V2 */,
-				B5A5440C2504949C000DC5E3 /* Advanced.EvolutionDemo.CreatureV4.swift */,
+				B5D6F202250E0D9C00DF5D2F /* V3 */,
+				B5D6F203250E0DA400DF5D2F /* V4 */,
 			);
 			name = Models;
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+		B5D6F1F9250E08D200DF5D2F /* V1 */ = {
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+				B5A5440625049480000DC5E3 /* Advanced.EvolutionDemo.V1.Creature.swift */,
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+			name = V1;
+			sourceTree = "<group>";
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+		B5D6F1FA250E0AE000DF5D2F /* V2 */ = {
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+			);
+			name = V2;
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+			);
+			name = V3;
+			sourceTree = "<group>";
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-				B5A543D724FB7478000DC5E3 /* Classic.ColorsDemo.swift in Sources */,
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 				B566C8EC24F9D694001134A1 /* Modern.PokedexDemo.ItemCell.swift in Sources */,
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-				B5A543DD24FB78F9000DC5E3 /* Classic.ColorsDemo.Palette.swift in Sources */,
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@@ -873,6 +934,17 @@
 			sourceTree = "<group>";
 			versionGroupType = wrapper.xcdatamodel;
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+		B5D6F20E250E1E3200DF5D2F /* Advanced.EvolutionDemo.V1.xcdatamodeld */ = {
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Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.CreatureType.swift

@@ -16,9 +16,9 @@ extension Advanced.EvolutionDemo {
 
 // MARK: - Advanced.EvolutionDemo.CreatureType
 
-protocol Advanced_EvolutionDemo_CreatureType: CoreStoreObject, CustomStringConvertible {
+protocol Advanced_EvolutionDemo_CreatureType: DynamicObject, CustomStringConvertible {
 
     var dnaCode: Int64 { get }
 
-    func mutate()
+    func mutate(in transaction: BaseDataTransaction)
 }

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.CreatureV1.swift

@@ -1,30 +0,0 @@
-//
-// Demo
-// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
-
-import UIKit
-import CoreStore
-
-// MARK: - Advanced.EvolutionDemo
-
-extension Advanced.EvolutionDemo {
-
-    // MARK: - Advanced.EvolutionDemo.CreatureV1
-    
-    final class CreatureV1: CoreStoreObject, Advanced.EvolutionDemo.CreatureType {
-        
-        // MARK: Internal
-        
-        @Field.Stored("dnaCode")
-        var dnaCode: Int64 = 0
-
-        @Field.Stored("hasHead")
-        var hasHead: Bool = false
-
-        @Field.Stored("hasTail")
-        var hasTail: Bool = false
-
-        @Field.Stored("numberOfFlagella")
-        var numberOfFlagella: Int32 = 0
-    }
-}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.CreatureV2.swift

@@ -1,30 +0,0 @@
-//
-// Demo
-// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
-
-import UIKit
-import CoreStore
-
-// MARK: - Advanced.EvolutionDemo
-
-extension Advanced.EvolutionDemo {
-
-    // MARK: - Advanced.EvolutionDemo.CreatureV2
-
-    final class CreatureV2: CoreStoreObject, Advanced.EvolutionDemo.CreatureType {
-        
-        // MARK: Internal
-
-        @Field.Stored("dnaCode")
-        var dnaCode: Int64 = 0
-
-        @Field.Stored("hasHead")
-        var hasHead: Bool = false
-
-        @Field.Stored("hasTail")
-        var hasTail: Bool = false
-
-        @Field.Stored("hasTail")
-        var numberOfFlippers: Int32 = 0
-    }
-}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.CreatureV3.swift

@@ -1,30 +0,0 @@
-//
-// Demo
-// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
-
-import UIKit
-import CoreStore
-
-// MARK: - Advanced.EvolutionDemo
-
-extension Advanced.EvolutionDemo {
-
-    // MARK: - Advanced.EvolutionDemo.CreatureV3
-
-    final class CreatureV3: CoreStoreObject, Advanced.EvolutionDemo.CreatureType {
-
-        // MARK: Internal
-
-        @Field.Stored("dnaCode")
-        var dnaCode: Int64 = 0
-
-        @Field.Stored("hasHead")
-        var hasHead: Bool = false
-
-        @Field.Stored("hasTail")
-        var hasTail: Bool = false
-
-        @Field.Stored("hasTail")
-        var numberOfFlippers: Int32 = 0
-    }
-}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.CreatureV4.swift

@@ -1,30 +0,0 @@
-//
-// Demo
-// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
-
-import UIKit
-import CoreStore
-
-// MARK: - Advanced.EvolutionDemo
-
-extension Advanced.EvolutionDemo {
-
-    // MARK: - Advanced.EvolutionDemo.CreatureV4
-
-    final class CreatureV4: CoreStoreObject, Advanced.EvolutionDemo.CreatureType {
-
-        // MARK: Internal
-
-        @Field.Stored("dnaCode")
-        var dnaCode: Int64 = 0
-
-        @Field.Stored("hasHead")
-        var hasHead: Bool = false
-
-        @Field.Stored("hasTail")
-        var hasTail: Bool = false
-
-        @Field.Stored("hasTail")
-        var numberOfFlippers: Int32 = 0
-    }
-}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.GeologicalPeriod.swift

@@ -0,0 +1,35 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+// MARK: - AdvancedEvolutionDemo
+
+extension Advanced.EvolutionDemo {
+    
+    // MARK: - GeologicalPeriod
+    
+    enum GeologicalPeriod: CaseIterable {
+
+        // MARK: Internal
+        
+        case ageOfInvertebrates
+        case ageOfFishes
+        case ageOfReptiles
+        case ageOfMammals
+
+        var creatureType: Advanced.EvolutionDemo.CreatureType.Type {
+
+            switch self {
+
+            case .ageOfInvertebrates:
+                return Advanced.EvolutionDemo.V1.Creature.self
+            case .ageOfFishes:
+                return Advanced.EvolutionDemo.V2.Creature.self
+            case .ageOfReptiles:
+                return Advanced.EvolutionDemo.V3.Creature.self
+            case .ageOfMammals:
+                return Advanced.EvolutionDemo.V4.Creature.self
+            }
+        }
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.Migrator.swift

@@ -0,0 +1,93 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import CoreStore
+import Foundation
+import Combine
+
+
+// MARK: - Advanced.EvolutionDemo
+
+extension Advanced.EvolutionDemo {
+    
+    // MARK: - Advanced.EvolutionDemo.Migrator
+    
+    final class Migrator: ObservableObject {
+        
+        var currentPeriod: Advanced.EvolutionDemo.GeologicalPeriod? {
+            
+            return self.current?.period
+        }
+        
+        
+        // MARK: Private
+        
+        private var current: (period: Advanced.EvolutionDemo.GeologicalPeriod, dataStack: DataStack)? {
+            
+            willSet {
+                
+                self.objectWillChange.send()
+            }
+        }
+        
+        private func findAndSetCurrentVersion() {
+            
+            let xcodeV1ToV2ModelSchema = XcodeDataModelSchema.from(
+                modelName: "Advanced.EvolutionDemo.V1",
+                bundle: Bundle(for: Advanced.EvolutionDemo.V1.Creature.self),
+                migrationChain: [
+                    Advanced.EvolutionDemo.V1.name,
+                    Advanced.EvolutionDemo.V2.name
+                ]
+            )
+            let dataStack = DataStack(
+                schemaHistory: SchemaHistory(
+                    allSchema: xcodeV1ToV2ModelSchema.allSchema
+                    + [
+                        CoreStoreSchema(
+                            modelVersion: Advanced.EvolutionDemo.V3.name,
+                            entities: [
+                                Entity<Advanced.EvolutionDemo.V3.Creature>("Creature")
+                            ]
+                        ),
+                        CoreStoreSchema(
+                            modelVersion: Advanced.EvolutionDemo.V4.name,
+                            entities: [
+                                Entity<Advanced.EvolutionDemo.V4.Creature>("Creature")
+                            ]
+                        )
+                    ],
+                    migrationChain: [
+                        Advanced.EvolutionDemo.V1.name,
+                        Advanced.EvolutionDemo.V2.name,
+                        Advanced.EvolutionDemo.V3.name,
+                        Advanced.EvolutionDemo.V4.name
+                    ]
+                )
+            )
+        }
+        
+        private func selectModelVersion(_ period: GeologicalPeriod) {
+            
+            guard period != self.current?.period else {
+                
+                return
+            }
+            
+            // explicitly trigger `NSPersistentStore` cleanup by deallocating the `DataStack`
+            self.current = nil
+            
+        }
+        
+        
+        // MARK: - VersionMetadata
+        
+        private struct VersionMetadata {
+            
+            let label: String
+            let entityType: Advanced.EvolutionDemo.CreatureType.Type
+            let schemaHistory: SchemaHistory
+        }
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V1.Creature.swift

@@ -0,0 +1,38 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import UIKit
+import CoreStore
+
+
+// MARK: - Advanced.EvolutionDemo.V1.Creature
+
+@objc(Advanced_EvolutionDemo_V1_Creature)
+final class Advanced_EvolutionDemo_V1_Creature: NSManagedObject, Advanced.EvolutionDemo.CreatureType {
+
+    @NSManaged
+    dynamic var dnaCode: Int64
+    
+    @NSManaged
+    dynamic var numberOfFlagella: Int32
+    
+    
+    // MARK: CustomStringConvertible
+    
+    override var description: String {
+        
+        return """
+            dnaCode: \(self.dnaCode)
+            numberOfFlagella: \(self.numberOfFlagella)
+            """
+    }
+    
+    
+    // MARK: Advanced.EvolutionDemo.CreatureType
+    
+    func mutate(in transaction: BaseDataTransaction) {
+        
+        self.numberOfFlagella = .random(in: 1...200)
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V1.swift

@@ -0,0 +1,25 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import CoreStore
+
+
+// MARK: - Advanced.EvolutionDemo
+
+extension Advanced.EvolutionDemo {
+    
+    // MARK: - Advanced.EvolutionDemo.V1
+    
+    /**
+    Namespace for V1 models (`Advanced.EvolutionDemo.GeologicalPeriod.ageOfInvertebrates`)
+    */
+    enum V1 {
+        
+        // MARK: Internal
+        
+        static let name: ModelVersion = "Advanced.Evolution.V1"
+        
+        typealias Creature = Advanced_EvolutionDemo_V1_Creature
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V1.xcdatamodeld/.xccurrentversion

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>_XCCurrentVersionName</key>
+	<string>Advanced.EvolutionDemo.V1.xcdatamodel</string>
+</dict>
+</plist>

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V1.xcdatamodeld/Advanced.EvolutionDemo.V1.xcdatamodel/contents

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="16119" systemVersion="19F101" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Creature" representedClassName="Advanced_EvolutionDemo_V1_Creature" syncable="YES">
+        <attribute name="dnaCode" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
+        <attribute name="numberOfFlagella" attributeType="Integer 32" defaultValueString="2" usesScalarValueType="YES"/>
+    </entity>
+    <elements>
+        <element name="Creature" positionX="-27" positionY="18" width="128" height="73"/>
+    </elements>
+</model>

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V1.xcdatamodeld/Advanced.EvolutionDemo.V2.xcdatamodel/contents

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="16119" systemVersion="19F101" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Creature" representedClassName="Advanced_EvolutionDemo_V2_Creature" syncable="YES">
+        <attribute name="dnaCode" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
+        <attribute name="hasHead" attributeType="Boolean" defaultValueString="YES" usesScalarValueType="YES"/>
+        <attribute name="hasTail" attributeType="Boolean" defaultValueString="YES" usesScalarValueType="YES"/>
+        <attribute name="hasVertebrae" attributeType="Boolean" defaultValueString="YES" usesScalarValueType="YES"/>
+        <attribute name="numberOfFlippers" attributeType="Integer 32" defaultValueString="2" usesScalarValueType="YES"/>
+    </entity>
+    <elements>
+        <element name="Creature" positionX="-9" positionY="36" width="128" height="118"/>
+    </elements>
+</model>

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V2.Creature.swift

@@ -0,0 +1,53 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import UIKit
+import CoreStore
+
+
+// MARK: - Advanced.EvolutionDemo.V2.Creature
+
+@objc(Advanced_EvolutionDemo_V2_Creature)
+final class Advanced_EvolutionDemo_V2_Creature: NSManagedObject, Advanced.EvolutionDemo.CreatureType {
+
+    @NSManaged
+    dynamic var dnaCode: Int64
+    
+    @NSManaged
+    dynamic var numberOfFlippers: Int32
+    
+    @NSManaged
+    dynamic var hasVertebrae: Bool
+    
+    @NSManaged
+    dynamic var hasHead: Bool
+    
+    @NSManaged
+    dynamic var hasTail: Bool
+    
+    
+    // MARK: CustomStringConvertible
+    
+    override var description: String {
+        
+        return """
+            dnaCode: \(self.dnaCode)
+            numberOfFlippers: \(self.numberOfFlippers)
+            hasVertebrae: \(self.hasVertebrae)
+            hasHead: \(self.hasHead)
+            hasTail: \(self.hasTail)
+            """
+    }
+    
+    
+    // MARK: Advanced.EvolutionDemo.CreatureType
+    
+    func mutate(in transaction: BaseDataTransaction) {
+        
+        self.numberOfFlippers = .random(in: 1...4) * 2
+        self.hasVertebrae = .random()
+        self.hasHead = true
+        self.hasTail = .random()
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V2.swift

@@ -0,0 +1,25 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import CoreStore
+
+
+// MARK: - Advanced.EvolutionDemo
+
+extension Advanced.EvolutionDemo {
+    
+    // MARK: - Advanced.EvolutionDemo.V2
+    
+    /**
+    Namespace for V2 models (`Advanced.EvolutionDemo.GeologicalPeriod.ageOfFishes`)
+    */
+    enum V2 {
+        
+        // MARK: Internal
+        
+        static let name: ModelVersion = "Advanced.Evolution.V2"
+        
+        typealias Creature = Advanced_EvolutionDemo_V2_Creature
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V2.xcdatamodeld/Advanced.EvolutionDemo.V2.xcdatamodel/contents

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="16119" systemVersion="19F101" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Creature" representedClassName="Advanced_EvolutionDemo_V2_Creature" syncable="YES">
+        <attribute name="dnaCode" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
+        <attribute name="hasHead" attributeType="Boolean" defaultValueString="YES" usesScalarValueType="YES"/>
+        <attribute name="hasTail" attributeType="Boolean" defaultValueString="YES" usesScalarValueType="YES"/>
+        <attribute name="hasVertebrae" attributeType="Boolean" defaultValueString="YES" usesScalarValueType="YES"/>
+        <attribute name="numberOfFlippers" attributeType="Integer 32" defaultValueString="2" usesScalarValueType="YES"/>
+    </entity>
+    <elements>
+        <element name="Creature" positionX="-45" positionY="0" width="128" height="118"/>
+    </elements>
+</model>

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V3.Creature.swift

@@ -0,0 +1,78 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import UIKit
+import CoreStore
+
+// MARK: - Advanced.EvolutionDemo.V3
+
+extension Advanced.EvolutionDemo.V3 {
+
+    // MARK: - Advanced.EvolutionDemo.V3.Creature
+
+    final class Creature: CoreStoreObject, Advanced.EvolutionDemo.CreatureType {
+        
+        // MARK: Internal
+
+        @Field.Stored("dnaCode")
+        var dnaCode: Int64 = 0
+
+        @Field.Stored("numberOfLimbs")
+        var numberOfLimbs: Int32 = 0
+
+        @Field.Stored("hasVertebrae")
+        var hasVertebrae: Bool = false
+
+        @Field.Stored("hasHead")
+        var hasHead: Bool = true
+
+        @Field.Stored("hasTail")
+        var hasTail: Bool = true
+
+        @Field.Stored("hasWings")
+        var hasWings: Bool = false
+
+        @Field.Stored("habitat")
+        var habitat: Habitat = .water
+        
+        
+        // MARK: - Habitat
+        
+        enum Habitat: String, CaseIterable, ImportableAttributeType, FieldStorableType {
+            
+            case water = "water"
+            case land = "land"
+            case amphibian = "amphibian"
+        }
+        
+        
+        // MARK: CustomStringConvertible
+        
+        var description: String {
+            
+            return """
+                dnaCode: \(self.dnaCode)
+                numberOfLimbs: \(self.numberOfLimbs)
+                hasVertebrae: \(self.hasVertebrae)
+                hasHead: \(self.hasHead)
+                hasTail: \(self.hasTail)
+                habitat: \(self.habitat)
+                hasWings: \(self.hasWings)
+                """
+        }
+        
+        
+        // MARK: Advanced.EvolutionDemo.CreatureType
+        
+        func mutate(in transaction: BaseDataTransaction) {
+            
+            self.numberOfLimbs = .random(in: 1...4) * 2
+            self.hasVertebrae = .random()
+            self.hasHead = true
+            self.hasTail = .random()
+            self.habitat = Habitat.allCases.randomElement()!
+            self.hasWings = .random()
+        }
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V3.swift

@@ -0,0 +1,23 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import CoreStore
+
+
+// MARK: - Advanced.EvolutionDemo
+
+extension Advanced.EvolutionDemo {
+    
+    // MARK: - Advanced.EvolutionDemo.V3
+    
+    /**
+    Namespace for V3 models (`Advanced.EvolutionDemo.GeologicalPeriod.ageOfReptiles`)
+    */
+    enum V3 {
+        
+        // MARK: Internal
+        
+        static let name: ModelVersion = "Advanced.Evolution.V3"
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V4.Creature.swift

@@ -0,0 +1,75 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import UIKit
+import CoreStore
+
+// MARK: - Advanced.EvolutionDemo.V4
+
+extension Advanced.EvolutionDemo.V4 {
+
+    // MARK: - Advanced.EvolutionDemo.V4.Creature
+
+    final class Creature: CoreStoreObject, Advanced.EvolutionDemo.CreatureType {
+        
+        // MARK: Internal
+
+        @Field.Stored("dnaCode")
+        var dnaCode: Int64 = 0
+
+        @Field.Stored("numberOfLimbs")
+        var numberOfLimbs: Int32 = 0
+
+        @Field.Stored("hasVertebrae")
+        var hasVertebrae: Bool = false
+
+        @Field.Stored("hasHead")
+        var hasHead: Bool = true
+
+        @Field.Stored("hasTail")
+        var hasTail: Bool = false
+
+        @Field.Stored("hasWings")
+        var hasWings: Bool = false
+        
+        
+        typealias Habitat = Advanced.EvolutionDemo.V3.Creature.Habitat
+
+        @Field.Stored("habitat")
+        var habitat: Habitat = .water
+
+        @Field.Stored("isWarmBlooded")
+        var isWarmBlooded: Bool = true
+        
+        
+        // MARK: CustomStringConvertible
+        
+        var description: String {
+            
+            return """
+                dnaCode: \(self.dnaCode)
+                numberOfLimbs: \(self.numberOfLimbs)
+                hasVertebrae: \(self.hasVertebrae)
+                hasHead: \(self.hasHead)
+                hasTail: \(self.hasTail)
+                habitat: \(self.habitat)
+                hasWings: \(self.hasWings)
+                """
+        }
+        
+        
+        // MARK: Advanced.EvolutionDemo.CreatureType
+        
+        func mutate(in transaction: BaseDataTransaction) {
+            
+            self.numberOfLimbs = .random(in: 1...4) * 2
+            self.hasVertebrae = .random()
+            self.hasHead = true
+            self.hasTail = .random()
+            self.habitat = Habitat.allCases.randomElement()!
+            self.hasWings = .random()
+            self.isWarmBlooded = .random()
+        }
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.V4.swift

@@ -0,0 +1,23 @@
+//
+// Demo
+// Copyright © 2020 John Rommel Estropia, Inc. All rights reserved.
+
+import CoreStore
+
+
+// MARK: - Advanced.EvolutionDemo
+
+extension Advanced.EvolutionDemo {
+    
+    // MARK: - Advanced.EvolutionDemo.V4
+    
+    /**
+    Namespace for V3 models (`Advanced.EvolutionDemo.GeologicalPeriod.ageOfMammals`)
+    */
+    enum V4 {
+        
+        // MARK: Internal
+        
+        static let name: ModelVersion = "Advanced.Evolution.V4"
+    }
+}

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.swift

@@ -11,24 +11,5 @@ extension Advanced {
     /**
     Sample execution of progressive migrations. This demo also supports backwards migration.
     */
-    enum EvolutionDemo: CaseIterable {
+    enum EvolutionDemo {}
-        
-        // MARK: Internal
-        
-        case ageOfInvertebrates
-        case ageOfFishes
-        case ageOfReptiles
-        case ageOfMammals
-
-        var creatureType: Advanced.EvolutionDemo.CreatureType.Type {
-
-            switch self {
-
-            case .ageOfInvertebrates:   return Advanced.EvolutionDemo.CreatureV1.self
-            case .ageOfFishes:          return Advanced.EvolutionDemo.CreatureV2.self
-            case .ageOfReptiles:        return Advanced.EvolutionDemo.CreatureV3.self
-            case .ageOfMammals:         return Advanced.EvolutionDemo.CreatureV4.self
-            }
-        }
-    }
 }

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.xcdatamodeld/.xccurrentversion

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict/>
+</plist>

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.xcdatamodeld/Advanced.EvolutionDemo.V2.xcdatamodel/contents

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="16119" systemVersion="19F101" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Creature" representedClassName="Advanced_EvolutionDemo_V1_Creature" syncable="YES" codeGenerationType="class">
+        <attribute name="dnaCode" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
+        <attribute name="numberOfFlagella" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES"/>
+    </entity>
+    <elements>
+        <element name="Creature" positionX="-36" positionY="9" width="128" height="73"/>
+    </elements>
+</model>

Demo/⭐️Sources/⭐️Demos/⭐️Advanced/EvolutionDemo/Advanced.EvolutionDemo.xcdatamodeld/Advanced.EvolutionDemo.xcdatamodel/contents

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="16119" systemVersion="19F101" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Creature" representedClassName="Advanced_EvolutionDemo_V1_Creature" syncable="YES" codeGenerationType="class">
+        <attribute name="dnaCode" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
+        <attribute name="numberOfFlagella" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES"/>
+    </entity>
+    <elements>
+        <element name="Creature" positionX="-36" positionY="9" width="128" height="73"/>
+    </elements>
+</model>