rename CoreStoreDemo to LegacyDemo

2026-04-30 12:34:16 +02:00 · 2020-09-19 14:32:43 +09:00
parent 98a42feb95
commit 228e4e8e1a
69 changed files with 96 additions and 368 deletions
--- a/LegacyDemo/LegacyDemo/AppDelegate.swift
+++ b/LegacyDemo/LegacyDemo/AppDelegate.swift
@@ -0,0 +1,26 @@
+//
+//  AppDelegate.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/02.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+
+
+// MARK: - AppDelegate
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+    // MARK: UIApplicationDelegate
+    
+    var window: UIWindow?
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
+
+        return true
+    }
+}
+
--- a/LegacyDemo/LegacyDemo/Base.lproj/LaunchScreen.xib
+++ b/LegacyDemo/LegacyDemo/Base.lproj/LaunchScreen.xib
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14313.18" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14283.14"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="iN0-l3-epB">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="  Copyright © 2018 John Rommel Estropia. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
+                    <rect key="frame" x="20" y="439" width="440" height="21"/>
+                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                    <color key="textColor" red="0.90744441747665405" green="0.9265514612197876" blue="0.93116652965545654" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                    <nil key="highlightedColor"/>
+                </label>
+                <imageView userInteractionEnabled="NO" contentMode="center" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="CoreStoreIcon" translatesAutoresizingMaskIntoConstraints="NO" id="q8C-V6-gXH">
+                    <rect key="frame" x="155" y="83" width="170" height="170"/>
+                </imageView>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="CoreStore" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
+                    <rect key="frame" x="20" y="273" width="440" height="57.5"/>
+                    <fontDescription key="fontDescription" name="HelveticaNeue-UltraLight" family="Helvetica Neue" pointSize="50"/>
+                    <color key="textColor" red="0.90744441747665405" green="0.9265514612197876" blue="0.93116652965545654" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                    <nil key="highlightedColor"/>
+                </label>
+            </subviews>
+            <color key="backgroundColor" red="0.15542715787887573" green="0.2203737199306488" blue="0.2959403395652771" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <constraints>
+                <constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
+                <constraint firstAttribute="bottom" secondItem="8ie-xW-0ye" secondAttribute="bottom" constant="20" id="Kzo-t9-V3l"/>
+                <constraint firstItem="8ie-xW-0ye" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="MfP-vx-nX0"/>
+                <constraint firstItem="q8C-V6-gXH" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="centerY" multiplier="0.7" id="QW6-8Y-w15"/>
+                <constraint firstAttribute="centerX" secondItem="8ie-xW-0ye" secondAttribute="centerX" id="ZEH-qu-HZ9"/>
+                <constraint firstItem="q8C-V6-gXH" firstAttribute="centerX" secondItem="iN0-l3-epB" secondAttribute="centerX" id="fRb-1V-9iD"/>
+                <constraint firstItem="kId-c2-rCX" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="fvb-Df-36g"/>
+                <constraint firstItem="kId-c2-rCX" firstAttribute="top" secondItem="q8C-V6-gXH" secondAttribute="bottom" constant="20" id="s63-MP-ush"/>
+            </constraints>
+            <nil key="simulatedStatusBarMetrics"/>
+            <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
+            <point key="canvasLocation" x="548" y="455"/>
+        </view>
+    </objects>
+    <resources>
+        <image name="CoreStoreIcon" width="170" height="170"/>
+    </resources>
+</document>
--- a/LegacyDemo/LegacyDemo/Base.lproj/Main.storyboard
+++ b/LegacyDemo/LegacyDemo/Base.lproj/Main.storyboard
--- a/Demo/FetchingAndQueryingDemoViewController.swift
+++ b/Demo/FetchingAndQueryingDemoViewController.swift
@@ -0,0 +1,319 @@
+//
+//  FetchingAndQueryingDemoViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/12.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import CoreStore
+
+
+private struct Static {
+    
+    static let timeZonesStack: DataStack = {
+        
+        let dataStack = DataStack()
+        try! dataStack.addStorageAndWait(
+            SQLiteStore(
+                fileName: "TimeZoneDemo.sqlite",
+                configuration: "FetchingAndQueryingDemo",
+                localStorageOptions: .recreateStoreOnModelMismatch
+            )
+        )
+        _ = try? dataStack.perform(
+            synchronous: { (transaction) in
+                
+                try transaction.deleteAll(From<TimeZone>())
+                
+                for name in NSTimeZone.knownTimeZoneNames {
+                    
+                    let rawTimeZone = NSTimeZone(name: name)!
+                    let cachedTimeZone = transaction.create(Into<TimeZone>())
+                    
+                    cachedTimeZone.name = rawTimeZone.name
+                    cachedTimeZone.abbreviation = rawTimeZone.abbreviation ?? ""
+                    cachedTimeZone.secondsFromGMT = Int32(rawTimeZone.secondsFromGMT)
+                    cachedTimeZone.hasDaylightSavingTime = rawTimeZone.isDaylightSavingTime
+                    cachedTimeZone.daylightSavingTimeOffset = rawTimeZone.daylightSavingTimeOffset
+                }
+            }
+        )
+        return dataStack
+    }()
+}
+
+
+// MARK: - FetchingAndQueryingDemoViewController
+
+class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
+    
+    // MARK: UIViewController
+    
+    override func viewDidAppear(_ animated: Bool) {
+        
+        super.viewDidAppear(animated)
+        
+        if self.didAppearOnce {
+            
+            return
+        }
+        
+        self.didAppearOnce = true
+        
+        let alert = UIAlertController(
+            title: "Fetch and Query Demo",
+            message: "This demo shows how to execute fetches and queries.\n\nEach menu item executes and displays a preconfigured fetch/query.",
+            preferredStyle: .alert
+        )
+        alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+        self.present(alert, animated: true, completion: nil)
+    }
+    
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
+        
+        super.prepare(for: segue, sender: sender)
+        
+        if let indexPath = sender as? IndexPath {
+            
+            switch segue.destination {
+                
+            case let controller as FetchingResultsViewController:
+                let item = self.fetchingItems[indexPath.row]
+                controller.set(timeZones: item.fetch(), title: item.title)
+                
+            case let controller as QueryingResultsViewController:
+                let item = self.queryingItems[indexPath.row]
+                controller.set(value: item.query(), title: item.title)
+                
+            default:
+                break
+            }
+        }
+    }
+    
+    
+    // MARK: UITableViewDataSource
+    
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        
+        switch self.segmentedControl?.selectedSegmentIndex {
+            
+        case Section.fetching.rawValue?:
+            return self.fetchingItems.count
+            
+        case Section.querying.rawValue?:
+            return self.queryingItems.count
+            
+        default:
+            return 0
+        }
+    }
+    
+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        
+        let cell = tableView.dequeueReusableCell(withIdentifier: "UITableViewCell")!
+        
+        switch self.segmentedControl?.selectedSegmentIndex {
+            
+        case Section.fetching.rawValue?:
+            cell.textLabel?.text = self.fetchingItems[indexPath.row].title
+            
+        case Section.querying.rawValue?:
+            cell.textLabel?.text = self.queryingItems[indexPath.row].title
+            
+        default:
+            cell.textLabel?.text = nil
+        }
+        
+        return cell
+    }
+    
+    
+    // MARK: UITableViewDelegate
+    
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        
+        tableView.deselectRow(at: indexPath, animated: true)
+        
+        switch self.segmentedControl?.selectedSegmentIndex {
+            
+        case Section.fetching.rawValue?:
+            self.performSegue(withIdentifier: "FetchingResultsViewController", sender: indexPath)
+            
+        case Section.querying.rawValue?:
+            self.performSegue(withIdentifier: "QueryingResultsViewController", sender: indexPath)
+            
+        default:
+            break
+        }
+    }
+    
+    
+    // MARK: Private
+    
+    private enum Section: Int {
+        
+        case fetching
+        case querying
+    }
+    
+    private let fetchingItems = [
+        (
+            title: "All Time Zones",
+            fetch: { () -> [TimeZone] in
+                
+                return try! Static.timeZonesStack.fetchAll(
+                    From<TimeZone>()
+                        .orderBy(.ascending(\.name))
+                )
+            }
+        ),
+        (
+            title: "Time Zones in Asia",
+            fetch: { () -> [TimeZone] in
+                
+                return try! Static.timeZonesStack.fetchAll(
+                    From<TimeZone>()
+                        .where(
+                            format: "%K BEGINSWITH[c] %@",
+                            #keyPath(TimeZone.name),
+                            "Asia"
+                        )
+                        .orderBy(.ascending(\.secondsFromGMT))
+                )
+            }
+        ),
+        (
+            title: "Time Zones in America and Europe",
+            fetch: { () -> [TimeZone] in
+                
+                return try! Static.timeZonesStack.fetchAll(
+                    From<TimeZone>()
+                        .where(
+                            format: "%K BEGINSWITH[c] %@ OR %K BEGINSWITH[c] %@",
+                            #keyPath(TimeZone.name),
+                            "America",
+                            #keyPath(TimeZone.name),
+                            "Europe"
+                        )
+                        .orderBy(.ascending(\.secondsFromGMT))
+                )
+            }
+        ),
+        (
+            title: "All Time Zones Except America",
+            fetch: { () -> [TimeZone] in
+                
+                return try! Static.timeZonesStack.fetchAll(
+                    From<TimeZone>()
+                        .where(
+                            format: "%K BEGINSWITH[c] %@",
+                            #keyPath(TimeZone.name),
+                            "America"
+                        )
+                        .orderBy(.ascending(\.secondsFromGMT))
+                    )
+            }
+        ),
+        (
+            title: "Time Zones with Summer Time",
+            fetch: { () -> [TimeZone] in
+                
+                return try! Static.timeZonesStack.fetchAll(
+                    From<TimeZone>()
+                        .where(\.hasDaylightSavingTime == true)
+                        .orderBy(.ascending(\.name))
+                )
+            }
+        )
+    ]
+    
+    private let queryingItems: [(title: String, query: () -> Any)] = [
+        (
+            title: "Number of Time Zones",
+            query: { () -> Any in
+                
+                return try! Static.timeZonesStack.queryValue(
+                    From<TimeZone>()
+                        .select(NSNumber.self, .count(\.name))
+                )!
+            }
+        ),
+        (
+            title: "Abbreviation For Tokyo's Time Zone",
+            query: { () -> Any in
+                
+                return try! Static.timeZonesStack.queryValue(
+                    From<TimeZone>()
+                        .select(String.self, .attribute(\.abbreviation))
+                        .where(format: "%K ENDSWITH[c] %@", #keyPath(TimeZone.name), "Tokyo")
+                )!
+            }
+        ),
+        (
+            title: "All Abbreviations",
+            query: { () -> Any in
+                
+                return try! Static.timeZonesStack.queryAttributes(
+                    From<TimeZone>()
+                        .select(
+                            NSDictionary.self,
+                            .attribute(\.name),
+                            .attribute(\.abbreviation)
+                        )
+                        .orderBy(.ascending(\.name))
+                )
+            }
+        ),
+        (
+            title: "Number of Countries per Time Zone",
+            query: { () -> Any in
+                
+                return try! Static.timeZonesStack.queryAttributes(
+                    From<TimeZone>()
+                        .select(
+                            NSDictionary.self,
+                            .count(\.abbreviation),
+                            .attribute(\.abbreviation)
+                        )
+                        .groupBy(\.abbreviation)
+                        .orderBy(
+                            .ascending(\.secondsFromGMT),
+                            .ascending(\.name)
+                        )
+                )
+            }
+        ),
+        (
+            title: "Number of Countries with Summer Time",
+            query: { () -> Any in
+                
+                return try! Static.timeZonesStack.queryAttributes(
+                    From<TimeZone>()
+                        .select(
+                            NSDictionary.self,
+                            .count(\.hasDaylightSavingTime, as: "numberOfCountries"),
+                            .attribute(\.hasDaylightSavingTime)
+                        )
+                        .groupBy(\.hasDaylightSavingTime)
+                        .orderBy(
+                            .descending(\.hasDaylightSavingTime),
+                            .ascending(\.name)
+                        )
+                )
+            }
+        )
+    ]
+    
+    var didAppearOnce = false
+    
+    @IBOutlet dynamic weak var segmentedControl: UISegmentedControl?
+    @IBOutlet dynamic weak var tableView: UITableView?
+    
+    @IBAction dynamic func segmentedControlValueChanged(_ sender: AnyObject?) {
+        
+        self.tableView?.reloadData()
+    }
+}
--- a/Demo/FetchingResultsViewController.swift
+++ b/Demo/FetchingResultsViewController.swift
@@ -0,0 +1,68 @@
+//
+//  FetchingResultsViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/17.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+
+// MARK: - FetchingResultsViewController
+
+class FetchingResultsViewController: UITableViewController {
+
+    // MARK: Public
+    
+    func set(timeZones: [TimeZone]?, title: String) {
+        
+        self.timeZones += timeZones ?? []
+        self.sectionTitle = title
+        
+        self.tableView?.reloadData()
+    }
+    
+    
+    // MARK: UIViewController
+    
+    override func viewDidLoad() {
+        
+        super.viewDidLoad()
+        
+        self.tableView.estimatedRowHeight = 60
+        self.tableView.rowHeight = UITableView.automaticDimension
+    }
+    
+    
+    // MARK: UITableViewDataSource
+    
+    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        
+        return self.timeZones.count
+    }
+    
+    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        
+        let cell = tableView.dequeueReusableCell(withIdentifier: "UITableViewCell", for: indexPath)
+        
+        let timeZone = self.timeZones[indexPath.row]
+        cell.textLabel?.text = timeZone.name
+        cell.detailTextLabel?.text = timeZone.abbreviation
+        
+        return cell
+    }
+    
+    
+    // MARK: UITableViewDelegate
+    
+    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
+        
+        return self.sectionTitle
+    }
+    
+    
+    // MARK: Private
+    
+    var timeZones = [TimeZone]()
+    var sectionTitle: String?
+}
--- a/Demo/QueryingResultsViewController.swift
+++ b/Demo/QueryingResultsViewController.swift
@@ -0,0 +1,88 @@
+//
+//  QueryingResultsViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/17.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+
+class QueryingResultsViewController: UITableViewController {
+    
+    // MARK: Public
+    
+    func set(value: Any?, title: String) {
+        
+        switch value {
+            
+        case (let array as [Any])?:
+            self.values = array.map { (item: Any) -> (title: String, detail: String) in
+                (
+                    title: String(describing: item),
+                    detail: String(reflecting: type(of: item))
+                )
+            }
+            
+        case let item?:
+            self.values = [
+                (
+                    title: String(describing: item),
+                    detail: String(reflecting: type(of: item))
+                )
+            ]
+            
+        default:
+            self.values = []
+        }
+        
+        self.sectionTitle = title
+        
+        self.tableView?.reloadData()
+    }
+    
+    
+    // MARK: UIViewController
+    
+    override func viewDidLoad() {
+        
+        super.viewDidLoad()
+        
+        self.tableView.estimatedRowHeight = 60
+        self.tableView.rowHeight = UITableView.automaticDimension
+    }
+    
+    
+    // MARK: UITableViewDataSource
+    
+    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        
+        return self.values.count
+    }
+    
+    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        
+        let cell = tableView.dequeueReusableCell(withIdentifier: "UITableViewCell", for: indexPath)
+        
+        let value = self.values[indexPath.row]
+        
+        cell.textLabel?.text = value.title
+        cell.detailTextLabel?.text = value.detail
+        
+        return cell
+    }
+    
+    
+    // MARK: UITableViewDelegate
+    
+    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
+        
+        return self.sectionTitle
+    }
+    
+    
+    // MARK: Private
+    
+    var values: [(title: String, detail: String)] = []
+    var sectionTitle: String?
+}
--- a/LegacyDemo/LegacyDemo/Fetching
+++ b/LegacyDemo/LegacyDemo/Fetching
@@ -0,0 +1,20 @@
+//
+//  TimeZone.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/15.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+class TimeZone: NSManagedObject {
+
+    @NSManaged var secondsFromGMT: Int32
+    @NSManaged var abbreviation: String
+    @NSManaged var hasDaylightSavingTime: Bool
+    @NSManaged var daylightSavingTimeOffset: Double
+    @NSManaged var name: String
+
+}
--- a/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Contents.json
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,114 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-60@3x-1.png",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-76.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Mask + Oval 1 + Oval 1 + Oval 1.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "car",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "car",
+      "filename" : "Icon-60@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-60@2x.png
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-60@2x.png
--- a/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-60@3x-1.png
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-60@3x-1.png
--- a/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-60@3x.png
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-60@3x.png
--- a/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-76.png
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-76.png
--- a/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-76@2x.png
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Icon-76@2x.png
--- a/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Mask
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/AppIcon.appiconset/Mask
--- a/LegacyDemo/LegacyDemo/Images.xcassets/Contents.json
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/LegacyDemo/LegacyDemo/Images.xcassets/CoreStoreIcon.imageset/Contents.json
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/CoreStoreIcon.imageset/Contents.json
@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "CoreStoreIcon@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/LegacyDemo/LegacyDemo/Images.xcassets/CoreStoreIcon.imageset/CoreStoreIcon@2x.png
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/CoreStoreIcon.imageset/CoreStoreIcon@2x.png
--- a/LegacyDemo/LegacyDemo/Images.xcassets/first.imageset/Contents.json
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/first.imageset/Contents.json
@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "first.pdf"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/LegacyDemo/LegacyDemo/Images.xcassets/first.imageset/first.pdf
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/first.imageset/first.pdf
--- a/LegacyDemo/LegacyDemo/Images.xcassets/second.imageset/Contents.json
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/second.imageset/Contents.json
@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "second.pdf"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/LegacyDemo/LegacyDemo/Images.xcassets/second.imageset/second.pdf
+++ b/LegacyDemo/LegacyDemo/Images.xcassets/second.imageset/second.pdf
--- a/LegacyDemo/LegacyDemo/Info.plist
+++ b/LegacyDemo/LegacyDemo/Info.plist
@@ -0,0 +1,56 @@
+<?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>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleDisplayName</key>
+	<string>CoreStore</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>6.3.2</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>4</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UIStatusBarStyle</key>
+	<string>UIStatusBarStyleLightContent</string>
+	<key>UIStatusBarTintParameters</key>
+	<dict>
+		<key>UINavigationBar</key>
+		<dict>
+			<key>Style</key>
+			<string>UIBarStyleDefault</string>
+			<key>Translucent</key>
+			<false/>
+		</dict>
+	</dict>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+	<key>UIUserInterfaceStyle</key>
+	<string>Light</string>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
+</dict>
+</plist>
--- a/LegacyDemo/LegacyDemo/LegacyDemo.xcdatamodeld/LegacyDemo.xcdatamodel/contents
+++ b/LegacyDemo/LegacyDemo/LegacyDemo.xcdatamodeld/LegacyDemo.xcdatamodel/contents
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="15702" systemVersion="18G1012" minimumToolsVersion="Xcode 7.3" sourceLanguage="Objective-C" userDefinedModelVersionIdentifier="">
+    <entity name="Place" representedClassName="LegacyDemo.Place" syncable="YES">
+        <attribute name="latitude" optional="YES" attributeType="Double" defaultValueString="0.0" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="longitude" optional="YES" attributeType="Double" defaultValueString="0.0" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="subtitle" optional="YES" attributeType="String" syncable="YES"/>
+        <attribute name="title" optional="YES" attributeType="String" syncable="YES"/>
+    </entity>
+    <entity name="TimeZone" representedClassName="LegacyDemo.TimeZone" syncable="YES">
+        <attribute name="abbreviation" optional="YES" attributeType="String" syncable="YES"/>
+        <attribute name="daylightSavingTimeOffset" optional="YES" attributeType="Double" defaultValueString="0.0" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="hasDaylightSavingTime" optional="YES" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="name" optional="YES" attributeType="String" syncable="YES"/>
+        <attribute name="secondsFromGMT" optional="YES" attributeType="Integer 32" defaultValueString="0.0" usesScalarValueType="NO" syncable="YES"/>
+    </entity>
+    <configuration name="FetchingAndQueryingDemo">
+        <memberEntity name="TimeZone"/>
+    </configuration>
+    <configuration name="TransactionsDemo">
+        <memberEntity name="Place"/>
+    </configuration>
+    <elements>
+        <element name="Place" positionX="261" positionY="225" width="128" height="103"/>
+        <element name="TimeZone" positionX="297" positionY="270" width="128" height="120"/>
+    </elements>
+</model>
--- a/Demo/CollectionViewDemoViewController.swift
+++ b/Demo/CollectionViewDemoViewController.swift
@@ -0,0 +1,168 @@
+//
+//  CollectionViewDemoViewController.swift
+//  LegacyDemo
+//
+//  Created by John Estropia on 2019/10/17.
+//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import CoreStore
+
+
+// MARK: - CollectionViewDemoViewController
+
+final class CollectionViewDemoViewController: UICollectionViewController {
+
+    // MARK: UIViewController
+
+    override func viewDidLoad() {
+
+        super.viewDidLoad()
+
+        let navigationItem = self.navigationItem
+        navigationItem.leftBarButtonItems = [
+            self.editButtonItem,
+            UIBarButtonItem(
+                barButtonSystemItem: .trash,
+                target: self,
+                action: #selector(self.resetBarButtonItemTouched(_:))
+            )
+        ]
+
+        let filterBarButton = UIBarButtonItem(
+            title: ColorsDemo.filter.rawValue,
+            style: .plain,
+            target: self,
+            action: #selector(self.filterBarButtonItemTouched(_:))
+        )
+        navigationItem.rightBarButtonItems = [
+            UIBarButtonItem(
+                barButtonSystemItem: .add,
+                target: self,
+                action: #selector(self.addBarButtonItemTouched(_:))
+            ),
+            UIBarButtonItem(
+                barButtonSystemItem: .refresh,
+                target: self,
+                action: #selector(self.shuffleBarButtonItemTouched(_:))
+            ),
+            filterBarButton
+        ]
+        self.filterBarButton = filterBarButton
+
+        self.dataSource = DiffableDataSource.CollectionViewAdapter<Palette>(
+            collectionView: self.collectionView,
+            dataStack: ColorsDemo.stack,
+            cellProvider: { (collectionView, indexPath, palette) in
+
+                let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "PaletteCollectionViewCell", for: indexPath) as! PaletteCollectionViewCell
+                cell.colorView?.backgroundColor = palette.color
+                cell.label?.text = palette.colorText
+                return cell
+            },
+            supplementaryViewProvider: { (collectionView, kind, indexPath) in
+
+                switch kind {
+
+                case UICollectionView.elementKindSectionHeader:
+                    let view = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "PaletteCollectionSectionHeaderView", for: indexPath) as! PaletteCollectionSectionHeaderView
+                    view.label?.text = ColorsDemo.palettes.snapshot.sectionIDs[indexPath.section]
+                    return view
+
+                default:
+                    return nil
+                }
+            }
+        )
+        ColorsDemo.palettes.addObserver(self) { [weak self] (listPublisher) in
+
+            guard let self = self else {
+
+                return
+            }
+            self.filterBarButton?.title = ColorsDemo.filter.rawValue
+            self.dataSource?.apply(listPublisher.snapshot, animatingDifferences: true)
+        }
+        self.dataSource?.apply(ColorsDemo.palettes.snapshot, animatingDifferences: false)
+    }
+
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
+
+        super.prepare(for: segue, sender: sender)
+
+        switch (segue.identifier, segue.destination, sender) {
+
+        case ("ObjectObserverDemoViewController"?, let destinationViewController as ObjectObserverDemoViewController, let palette as ObjectPublisher<Palette>):
+            destinationViewController.setPalette(palette)
+
+        default:
+            break
+        }
+    }
+
+
+    // MARK: UICollectionViewDelegate
+
+    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
+
+        collectionView.deselectItem(at: indexPath, animated: true)
+
+        self.performSegue(
+            withIdentifier: "ObjectObserverDemoViewController",
+            sender: ColorsDemo.palettes.snapshot[indexPath]
+        )
+    }
+
+
+    // MARK: Private
+
+    private var filterBarButton: UIBarButtonItem?
+    private var dataSource: DiffableDataSource.CollectionViewAdapter<Palette>?
+
+    deinit {
+
+        ColorsDemo.palettes.removeObserver(self)
+    }
+
+    @IBAction private dynamic func resetBarButtonItemTouched(_ sender: AnyObject?) {
+
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+
+                try transaction.deleteAll(From<Palette>())
+            },
+            completion: { _ in }
+        )
+    }
+
+    @IBAction private dynamic func filterBarButtonItemTouched(_ sender: AnyObject?) {
+
+        ColorsDemo.filter = ColorsDemo.filter.next()
+    }
+
+    @IBAction private dynamic func addBarButtonItemTouched(_ sender: AnyObject?) {
+
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+
+                _ = transaction.create(Into<Palette>())
+            },
+            completion: { _ in }
+        )
+    }
+
+    @IBAction private dynamic func shuffleBarButtonItemTouched(_ sender: AnyObject?) {
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+
+                for palette in try transaction.fetchAll(From<Palette>()) {
+
+                    palette.hue = Palette.randomHue()
+                    palette.colorName = nil
+                }
+            },
+            completion: { _ in }
+        )
+    }
+}
--- a/LegacyDemo/LegacyDemo/List
+++ b/LegacyDemo/LegacyDemo/List
@@ -0,0 +1,88 @@
+//
+//  ColorsDemo.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2019/10/17.
+//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreStore
+
+
+// MARK: - ColorsDemo
+
+struct ColorsDemo {
+    
+    enum Filter: String {
+        
+        case all = "All Colors"
+        case light = "Light Colors"
+        case dark = "Dark Colors"
+        
+        func next() -> Filter {
+            
+            switch self {
+                
+            case .all: return .light
+            case .light: return .dark
+            case .dark: return .all
+            }
+        }
+        
+        func whereClause() -> Where<Palette> {
+            
+            switch self {
+                
+            case .all: return .init()
+            case .light: return (\Palette.$brightness >= 0.9)
+            case .dark: return (\Palette.$brightness <= 0.4)
+            }
+        }
+    }
+    
+    static var filter = Filter.all {
+        
+        didSet {
+            
+            try! self.palettes.refetch(
+                From<Palette>()
+                    .sectionBy(\.$colorName)
+                    .where(self.filter.whereClause())
+                    .orderBy(.ascending(\.$hue))
+            )
+        }
+    }
+    
+    static let stack: DataStack = {
+     
+        let dataStack = DataStack(
+            CoreStoreSchema(
+                modelVersion: "ColorsDemo",
+                entities: [
+                    Entity<Palette>("Palette"),
+                ],
+                versionLock: [
+                    "Palette": [0x8c25aa53c7c90a28, 0xa243a34d25f1a3a7, 0x56565b6935b6055a, 0x4f988bb257bf274f]
+                ]
+            )
+        )
+
+        try! dataStack.addStorageAndWait(
+            SQLiteStore(
+                fileName: "ColorsDemo.sqlite",
+                localStorageOptions: .recreateStoreOnModelMismatch
+            )
+        )
+        return dataStack
+    }()
+    
+    static let palettes: ListPublisher<Palette> = {
+
+        return ColorsDemo.stack.publishList(
+            From<Palette>()
+                .sectionBy(\.$colorName)
+                .orderBy(.ascending(\.$hue))
+        )
+    }()
+}
--- a/Demo/ListObserverDemoViewController.swift
+++ b/Demo/ListObserverDemoViewController.swift
@@ -0,0 +1,181 @@
+//
+//  ListObserverDemoViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/02.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import CoreStore
+
+
+// MARK: - ListObserverDemoViewController
+
+final class ListObserverDemoViewController: UITableViewController {
+
+    // MARK: - EditableDataSource
+
+    final class EditableDataSource: DiffableDataSource.TableViewAdapter<Palette> {
+
+        override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
+
+            switch editingStyle {
+
+            case .delete:
+                let palette = ColorsDemo.palettes.snapshot[indexPath]
+                ColorsDemo.stack.perform(
+                    asynchronous: { (transaction) in
+
+                        transaction.delete(palette)
+                    },
+                    completion: { _ in }
+                )
+
+            default:
+                break
+            }
+        }
+    }
+
+    
+    // MARK: UIViewController
+
+    override func viewDidLoad() {
+        
+        super.viewDidLoad()
+        
+        let navigationItem = self.navigationItem
+        navigationItem.leftBarButtonItems = [
+            self.editButtonItem,
+            UIBarButtonItem(
+                barButtonSystemItem: .trash,
+                target: self,
+                action: #selector(self.resetBarButtonItemTouched(_:))
+            )
+        ]
+        
+        let filterBarButton = UIBarButtonItem(
+            title: ColorsDemo.filter.rawValue,
+            style: .plain,
+            target: self,
+            action: #selector(self.filterBarButtonItemTouched(_:))
+        )
+        navigationItem.rightBarButtonItems = [
+            UIBarButtonItem(
+                barButtonSystemItem: .add,
+                target: self,
+                action: #selector(self.addBarButtonItemTouched(_:))
+            ),
+            UIBarButtonItem(
+                barButtonSystemItem: .refresh,
+                target: self,
+                action: #selector(self.shuffleBarButtonItemTouched(_:))
+            ),
+            filterBarButton
+        ]
+        self.filterBarButton = filterBarButton
+
+        self.dataSource = EditableDataSource(
+            tableView: self.tableView,
+            dataStack: ColorsDemo.stack,
+            cellProvider: { (tableView, indexPath, palette) in
+                
+                let cell = tableView.dequeueReusableCell(withIdentifier: "PaletteTableViewCell") as! PaletteTableViewCell
+                cell.colorView?.backgroundColor = palette.color
+                cell.label?.text = palette.colorText
+                return cell
+            }
+        )
+        ColorsDemo.palettes.addObserver(self) { [weak self] (listPublisher) in
+            
+            guard let self = self else {
+                
+                return
+            }
+            self.filterBarButton?.title = ColorsDemo.filter.rawValue
+            self.dataSource?.apply(listPublisher.snapshot, animatingDifferences: true)
+        }
+        self.dataSource?.apply(ColorsDemo.palettes.snapshot, animatingDifferences: false)
+    }
+    
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
+        
+        super.prepare(for: segue, sender: sender)
+        
+        switch (segue.identifier, segue.destination, sender) {
+            
+        case ("ObjectObserverDemoViewController"?, let destinationViewController as ObjectObserverDemoViewController, let palette as ObjectPublisher<Palette>):
+            destinationViewController.setPalette(palette)
+            
+        default:
+            break
+        }
+    }
+    
+    
+    // MARK: UITableViewDelegate
+    
+    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        
+        tableView.deselectRow(at: indexPath, animated: true)
+        
+        self.performSegue(
+            withIdentifier: "ObjectObserverDemoViewController",
+            sender: ColorsDemo.palettes.snapshot[indexPath]
+        )
+    }
+    
+    
+    // MARK: Private
+    
+    private var filterBarButton: UIBarButtonItem?
+    private var dataSource: DiffableDataSource.TableViewAdapter<Palette>?
+    
+    deinit {
+        
+        ColorsDemo.palettes.removeObserver(self)
+    }
+    
+    @IBAction private dynamic func resetBarButtonItemTouched(_ sender: AnyObject?) {
+        
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+                
+                try transaction.deleteAll(From<Palette>())
+            },
+            completion: { _ in }
+        )
+    }
+    
+    @IBAction private dynamic func filterBarButtonItemTouched(_ sender: AnyObject?) {
+        
+        ColorsDemo.filter = ColorsDemo.filter.next()
+    }
+    
+    @IBAction private dynamic func addBarButtonItemTouched(_ sender: AnyObject?) {
+        
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+                
+                _ = transaction.create(Into<Palette>())
+            },
+            completion: { _ in }
+        )
+    }
+
+    @IBAction private dynamic func shuffleBarButtonItemTouched(_ sender: AnyObject?) {
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+
+                for palette in try transaction.fetchAll(From<Palette>()) {
+
+                    palette.hue = Palette.randomHue()
+                    palette.colorName = nil
+                }
+            },
+            completion: { _ in }
+        )
+    }
+}
+
--- a/Demo/ObjectObserverDemoViewController.swift
+++ b/Demo/ObjectObserverDemoViewController.swift
@@ -0,0 +1,192 @@
+//
+//  ObjectObserverDemoViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/06.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import CoreStore
+
+
+// MARK: - ObjectObserverDemoViewController
+
+class ObjectObserverDemoViewController: UIViewController, ObjectObserver {
+    
+    func setPalette<O: ObjectRepresentation>(_ newValue: O?) where O.ObjectType == Palette {
+        
+        guard self.monitor?.object?.objectID() != newValue?.objectID() else {
+            
+            return
+        }
+        if let newValue = newValue {
+            
+            self.monitor = newValue.asReadOnly(in: ColorsDemo.stack).map(ColorsDemo.stack.monitorObject(_:))
+        }
+        else {
+            
+            self.monitor = nil
+        }
+    }
+    
+    
+    // MARK: NSObject
+    
+    deinit {
+        
+        self.monitor?.removeObserver(self)
+    }
+    
+
+    // MARK: UIViewController
+    
+    required init?(coder aDecoder: NSCoder) {
+        
+        if let palette = try! ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.$hue))) {
+            
+            self.monitor = ColorsDemo.stack.monitorObject(palette)
+        }
+        else {
+            
+            _ = try? ColorsDemo.stack.perform(
+                synchronous: { (transaction) in
+                    
+                    _ = transaction.create(Into<Palette>())
+                }
+            )
+            
+            let palette = try! ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.$hue)))!
+            self.monitor = ColorsDemo.stack.monitorObject(palette)
+        }
+        
+        super.init(coder: aDecoder)
+    }
+    
+    override func viewDidLoad() {
+        
+        super.viewDidLoad()
+        self.monitor?.addObserver(self)
+        
+        if let palette = self.monitor?.object {
+            
+            self.reloadPaletteInfo(palette, changedKeys: nil)
+        }
+    }
+    
+    
+    // MARK: ObjectObserver
+    
+    func objectMonitor(_ monitor: ObjectMonitor<Palette>, didUpdateObject object: Palette, changedPersistentKeys: Set<KeyPathString>) {
+        
+        self.reloadPaletteInfo(object, changedKeys: changedPersistentKeys)
+    }
+    
+    func objectMonitor(_ monitor: ObjectMonitor<Palette>, didDeleteObject object: Palette) {
+        
+        self.navigationItem.rightBarButtonItem?.isEnabled = false
+        
+        self.colorNameLabel?.alpha = 0.3
+        self.colorView?.alpha = 0.3
+        
+        self.hsbLabel?.text = "Deleted"
+        self.hsbLabel?.textColor = UIColor.red
+        
+        self.hueSlider?.isEnabled = false
+        self.saturationSlider?.isEnabled = false
+        self.brightnessSlider?.isEnabled = false
+    }
+
+    
+    // MARK: Private
+    
+    var monitor: ObjectMonitor<Palette>?
+    
+    @IBOutlet weak var colorNameLabel: UILabel?
+    @IBOutlet weak var colorView: UIView?
+    @IBOutlet weak var hsbLabel: UILabel?
+    @IBOutlet weak var dateLabel: UILabel?
+    @IBOutlet weak var hueSlider: UISlider?
+    @IBOutlet weak var saturationSlider: UISlider?
+    @IBOutlet weak var brightnessSlider: UISlider?
+    
+    @IBAction dynamic func hueSliderValueDidChange(_ sender: AnyObject?) {
+        
+        let hue = self.hueSlider?.value ?? 0
+        ColorsDemo.stack.perform(
+            asynchronous: { [weak self] (transaction) in
+                
+                if let palette = transaction.edit(self?.monitor?.object) {
+                    
+                    palette.hue = Int(hue)
+                }
+            },
+            completion: { _ in }
+        )
+    }
+    
+    @IBAction dynamic func saturationSliderValueDidChange(_ sender: AnyObject?) {
+        
+        let saturation = self.saturationSlider?.value ?? 0
+        ColorsDemo.stack.perform(
+            asynchronous: { [weak self] (transaction) in
+                
+                if let palette = transaction.edit(self?.monitor?.object) {
+                    
+                    palette.saturation = saturation
+                }
+            },
+            completion: { _ in }
+        )
+    }
+    
+    @IBAction dynamic func brightnessSliderValueDidChange(_ sender: AnyObject?) {
+        
+        let brightness = self.brightnessSlider?.value ?? 0
+        ColorsDemo.stack.perform(
+            asynchronous: { [weak self] (transaction) in
+                
+                if let palette = transaction.edit(self?.monitor?.object) {
+                    
+                    palette.brightness = brightness
+                }
+            },
+            completion: { _ in }
+        )
+    }
+    
+    @IBAction dynamic func deleteBarButtonTapped(_ sender: AnyObject?) {
+        
+        ColorsDemo.stack.perform(
+            asynchronous: { [weak self] (transaction) in
+                
+                transaction.delete(self?.monitor?.object)
+            },
+            completion: { _ in }
+        )
+    }
+    
+    func reloadPaletteInfo(_ palette: Palette, changedKeys: Set<String>?) {
+        
+        self.colorNameLabel?.text = palette.colorName
+        
+        let color = palette.color
+        self.colorNameLabel?.textColor = color
+        self.colorView?.backgroundColor = color
+        
+        self.hsbLabel?.text = palette.colorText
+        
+        if changedKeys == nil || changedKeys?.contains(String(keyPath: \Palette.$hue)) == true {
+            
+            self.hueSlider?.value = Float(palette.hue)
+        }
+        if changedKeys == nil || changedKeys?.contains(String(keyPath: \Palette.$saturation)) == true {
+            
+            self.saturationSlider?.value = palette.saturation
+        }
+        if changedKeys == nil || changedKeys?.contains(String(keyPath: \Palette.$brightness)) == true {
+            
+            self.brightnessSlider?.value = palette.brightness
+        }
+    }
+}
--- a/Demo/ObserversViewController.swift
+++ b/Demo/ObserversViewController.swift
@@ -0,0 +1,59 @@
+//
+//  ObserversViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/24.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+
+
+// MARK: - ObserversViewController
+
+class ObserversViewController: UIViewController {
+    
+    // MARK: UIViewController
+    
+    override func viewDidAppear(_ animated: Bool) {
+        
+        super.viewDidAppear(animated)
+        
+        let alert = UIAlertController(
+            title: "Observers Demo",
+            message: "This demo shows how to observe changes to a list of objects. The top and bottom view controllers both observe a single shared \"ListMonitor\" instance.\n\nTap on a row to see how to observe changes made to a single object using a \"ObjectMonitor\".",
+            preferredStyle: .alert
+        )
+        alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+        self.present(alert, animated: true, completion: nil)
+    }
+    
+    
+    // MARK: Private
+
+    @IBOutlet private dynamic weak var toggleTopBarButtonItem: UIBarButtonItem?
+    @IBOutlet private dynamic weak var toggleBottomBarButtonItem: UIBarButtonItem?
+    @IBOutlet private dynamic weak var stackView: UIStackView?
+    @IBOutlet private dynamic weak var topContainerView: UIView?
+    @IBOutlet private dynamic weak var bottomContainerView: UIView?
+    
+    @IBAction private dynamic func toggleTopContainerView() {
+
+        UIView.animate(withDuration: 0.2) {
+
+            self.topContainerView!.isHidden.toggle()
+        }
+        self.toggleTopBarButtonItem!.isEnabled = !self.bottomContainerView!.isHidden
+        self.toggleBottomBarButtonItem!.isEnabled = !self.topContainerView!.isHidden
+    }
+    
+    @IBAction private dynamic func toggleBottomContainerView() {
+
+        UIView.animate(withDuration: 0.2) {
+
+            self.bottomContainerView!.isHidden.toggle()
+        }
+        self.toggleTopBarButtonItem!.isEnabled = !self.bottomContainerView!.isHidden
+        self.toggleBottomBarButtonItem!.isEnabled = !self.topContainerView!.isHidden
+    }
+}
--- a/LegacyDemo/LegacyDemo/List
+++ b/LegacyDemo/LegacyDemo/List
@@ -0,0 +1,86 @@
+//
+//  Palette.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/05.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import UIKit
+import CoreData
+import CoreStore
+
+
+// MARK: - Palette
+
+final class Palette: CoreStoreObject {
+    
+    @Field.Stored(
+        "hue",
+        dynamicInitialValue: { Palette.randomHue() }
+    )
+    var hue: Int
+
+    @Field.Stored("saturation")
+    var saturation: Float = 1
+    
+    @Field.Stored(
+        "brightness",
+        dynamicInitialValue: { Palette.randomBrightness() }
+    )
+    var brightness: Float
+    
+    @Field.Virtual(
+        "colorName",
+        customGetter: { object, field in
+            if let colorName = field.primitiveValue {
+                return colorName
+            }
+            let colorName: String
+            switch object.$hue.value {
+            case 0 ..< 20: colorName = "Lower Reds"
+            case 20 ..< 57: colorName = "Oranges and Browns"
+            case 57 ..< 90: colorName = "Yellow-Greens"
+            case 90 ..< 159: colorName = "Greens"
+            case 159 ..< 197: colorName = "Blue-Greens"
+            case 197 ..< 241: colorName = "Blues"
+            case 241 ..< 297: colorName = "Violets"
+            case 297 ..< 331: colorName = "Magentas"
+            case 331 ..< 360: colorName = "Upper Reds"
+            default: colorName = "<Invalid>"
+            }
+            field.primitiveValue = colorName
+            return colorName
+        }
+    )
+    var colorName: String!
+    
+    static func randomHue() -> Int {
+        
+        return Int.random(in: 0 ..< 360)
+    }
+    
+    static func randomBrightness() -> Float {
+        
+        return (Float.random(in: 0 ..< 70) + 30) / 100.0
+    }
+}
+
+extension Palette {
+    
+    var color: UIColor {
+        
+        return UIColor(
+            hue: CGFloat(self.hue) / 360.0,
+            saturation: CGFloat(self.saturation),
+            brightness: CGFloat(self.brightness),
+            alpha: 1.0
+        )
+    }
+    
+    var colorText: String {
+        
+        return "H: \(self.hue)˚, S: \(round(self.saturation * 100.0))%, B: \(round(self.brightness * 100.0))%"
+    }
+}
--- a/Demo/PaletteCollectionSectionHeaderView.swift
+++ b/Demo/PaletteCollectionSectionHeaderView.swift
@@ -0,0 +1,17 @@
+//
+//  PaletteCollectionSectionHeaderView.swift
+//  LegacyDemo
+//
+//  Created by John Estropia on 2019/10/17.
+//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+
+
+// MARK: - PaletteCollectionSectionHeaderView
+
+final class PaletteCollectionSectionHeaderView: UICollectionReusableView {
+
+    @IBOutlet weak var label: UILabel?
+}
--- a/Demo/PaletteCollectionViewCell.swift
+++ b/Demo/PaletteCollectionViewCell.swift
@@ -0,0 +1,18 @@
+//
+//  PaletteCollectionViewCell.swift
+//  LegacyDemo
+//
+//  Created by John Estropia on 2019/10/17.
+//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+
+
+// MARK: - PaletteCollectionViewCell
+
+final class PaletteCollectionViewCell: UICollectionViewCell {
+
+    @IBOutlet weak var colorView: UIView?
+    @IBOutlet weak var label: UILabel?
+}
--- a/Demo/PaletteTableViewCell.swift
+++ b/Demo/PaletteTableViewCell.swift
@@ -0,0 +1,18 @@
+//
+//  PaletteTableViewCell.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/05.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+
+
+// MARK: - PaletteTableViewCell
+
+final class PaletteTableViewCell: UITableViewCell {
+    
+    @IBOutlet weak var colorView: UIView?
+    @IBOutlet weak var label: UILabel?
+}
--- a/Demo/CustomLoggerViewController.swift
+++ b/Demo/CustomLoggerViewController.swift
@@ -0,0 +1,126 @@
+//
+//  CustomLoggerViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/05.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import CoreStore
+
+
+// MARK: - CustomLoggerViewController
+
+class CustomLoggerViewController: UIViewController, CoreStoreLogger {
+    
+    // MARK: NSObject
+    
+    let dataStack = DataStack()
+    
+    // MARK: UIViewController
+
+    override func viewDidLoad() {
+        
+        super.viewDidLoad()
+        
+        try! self.dataStack.addStorageAndWait(SQLiteStore(fileName: "emptyStore.sqlite"))
+    }
+    
+    override func viewDidAppear(_ animated: Bool) {
+        
+        super.viewDidAppear(animated)
+
+        CoreStoreDefaults.logger = self
+
+        let alert = UIAlertController(
+            title: "Logger Demo",
+            message: "This demo shows how to plug-in any logging framework to CoreStore.\n\nThe view controller implements CoreStoreLogger and appends all logs to the text view.",
+            preferredStyle: .alert
+        )
+        alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+        self.present(alert, animated: true, completion: nil)
+    }
+
+    override func viewDidDisappear(_ animated: Bool) {
+
+        super.viewDidDisappear(animated)
+
+        CoreStoreDefaults.logger = DefaultLogger()
+    }
+
+    
+    // MARK: CoreStoreLogger
+    
+    func log(level: LogLevel, message: String, fileName: StaticString, lineNumber: Int, functionName: StaticString) {
+        
+        DispatchQueue.main.async { [weak self] in
+            
+            let levelString: String
+            switch level {
+                
+            case .trace: levelString = "Trace"
+            case .notice: levelString = "Notice"
+            case .warning: levelString = "Warning"
+            case .fatal: levelString = "Fatal"
+            }
+            self?.textView?.insertText("\((String(describing: fileName) as NSString).lastPathComponent):\(lineNumber) \(functionName)\n  ↪︎ [Log:\(levelString)] \(message)\n\n")
+        }
+    }
+    
+    func log(error: CoreStoreError, message: String, fileName: StaticString, lineNumber: Int, functionName: StaticString) {
+        
+        DispatchQueue.main.async { [weak self] in
+            
+            self?.textView?.insertText("\((String(describing: fileName) as NSString).lastPathComponent):\(lineNumber) \(functionName)\n  ↪︎ [Error] \(message): \(error)\n\n")
+        }
+    }
+    
+    func assert(_ condition: @autoclosure () -> Bool, message: @autoclosure () -> String, fileName: StaticString, lineNumber: Int, functionName: StaticString) {
+        
+        if condition() {
+            
+            return
+        }
+        
+        let messageString = message()
+        DispatchQueue.main.async { [weak self] in
+            
+            self?.textView?.insertText("\((String(describing: fileName) as NSString).lastPathComponent):\(lineNumber) \(functionName)\n  ↪︎ [Assert] \(messageString)\n\n")
+        }
+    }
+    
+    
+    // MARK: Private
+    
+    @IBOutlet dynamic weak var textView: UITextView?
+    @IBOutlet dynamic weak var segmentedControl: UISegmentedControl?
+    
+    @IBAction dynamic func segmentedControlValueChanged(_ sender: AnyObject?) {
+        
+        switch self.segmentedControl?.selectedSegmentIndex {
+            
+        case 0?:
+            let request = NSFetchRequest<NSFetchRequestResult>()
+            Where<NSManagedObject>(true).applyToFetchRequest(request)
+            Where<NSManagedObject>(false).applyToFetchRequest(request)
+            
+        case 1?:
+            _ = try? dataStack.addStorageAndWait(
+                SQLiteStore(
+                    fileName: "emptyStore.sqlite",
+                    configuration: "invalidStore"
+                )
+            )
+            
+        case 2?:
+            DispatchQueue.global(qos: .background).async {
+                
+                _ = try! self.dataStack.fetchOne(From<Place>())
+            }
+            
+        default:
+            return
+        }
+    }
+}
--- a/Demo/MigrationsDemoViewController.swift
+++ b/Demo/MigrationsDemoViewController.swift
@@ -0,0 +1,445 @@
+//
+//  MigrationsDemoViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/21.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import CoreStore
+
+
+// MARK: - MigrationsDemoViewController
+
+class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewDataSource, UITableViewDelegate {
+    
+    // MARK: UIViewController
+    
+    override func viewDidLoad() {
+        
+        super.viewDidLoad()
+        
+        if let segmentedControl = self.segmentedControl {
+            
+            for (index, model) in self.models.enumerated() {
+                
+                segmentedControl.setTitle(
+                    model.label,
+                    forSegmentAt: index
+                )
+            }
+        }
+        self.set(dataStack: nil, model: nil, scrollToSelection: false)
+    }
+    
+    override func viewDidAppear(_ animated: Bool) {
+        
+        super.viewDidAppear(animated)
+        
+        let alert = UIAlertController(
+            title: "Migrations Demo",
+            message: "This demo shows how to run progressive migrations and how to support multiple model versions in a single project.\n\nThe persistent store contains 10000 organisms, which gain/lose properties when the migration evolves/devolves them.\n\nYou can use the \"mutate\" button to change an organism's properties then migrate to a different model to see how its value gets affected.",
+            preferredStyle: .alert
+        )
+        alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+        self.present(alert, animated: true, completion: nil)
+        
+        
+        let modelMetadata = withExtendedLifetime(DataStack(xcodeModelName: "MigrationDemo")) {
+            (dataStack: DataStack) -> ModelMetadata in
+            
+            let models = self.models
+            let migrations = try! dataStack.requiredMigrationsForStorage(
+                SQLiteStore(fileName: "MigrationDemo.sqlite")
+            )
+            
+            guard let storeVersion = migrations.first?.sourceVersion else {
+            
+                return models.first!
+            }
+            for model in models {
+                
+                if model.schemaHistory.currentModelVersion == storeVersion {
+                    
+                    return model
+                }
+            }
+            
+            return models.first!
+        }
+        
+        self.selectModelVersion(modelMetadata)
+    }
+    
+    // MARK: ListObserver
+    
+    func listMonitorWillChange(_ monitor: ListMonitor<NSManagedObject>) { }
+    
+    func listMonitorDidChange(_ monitor: ListMonitor<NSManagedObject>) {
+        
+        if self.lastSelectedIndexPath == nil,
+            let numberOfObjectsInSection = self.listMonitor?.numberOfObjects(in: 0),
+            numberOfObjectsInSection > 0 {
+            
+            self.tableView?.reloadData()
+            self.setSelectedIndexPath(IndexPath(row: 0, section: 0), scrollToSelection: false)
+        }
+        else {
+            
+            self.updateDisplay(reloadData: true, scrollToSelection: true, animated: true)
+        }
+    }
+    
+    func listMonitorDidRefetch(_ monitor: ListMonitor<NSManagedObject>) {
+        
+        self.listMonitorDidChange(monitor)
+    }
+    
+    // MARK: UITableViewDataSource
+    
+    @objc dynamic func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        
+        return self.listMonitor?.numberOfObjects(in: 0) ?? 0
+    }
+    
+    @objc dynamic func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        
+        let cell = tableView.dequeueReusableCell(withIdentifier: "OrganismTableViewCell", for: indexPath) as! OrganismTableViewCell
+        
+        let dna = (self.listMonitor?[indexPath] as? OrganismProtocol)?.dna.description ?? ""
+        cell.dnaLabel?.text = "DNA: \(dna)"
+        cell.mutateButtonHandler = { [weak self] () -> Void in
+            
+            guard let `self` = self,
+                let dataStack = self.dataStack,
+                let organism = self.listMonitor?[indexPath] else {
+                    
+                    return
+            }
+            
+            self.setSelectedIndexPath(indexPath, scrollToSelection: false)
+            self.setEnabled(false)
+            dataStack.perform(
+                asynchronous: { (transaction) in
+                    
+                    let organism = transaction.edit(organism) as! OrganismProtocol
+                    organism.mutate()
+                },
+                completion: { [weak self] _ in
+                    
+                    self?.setEnabled(true)
+                }
+            )
+        }
+        return cell
+    }
+    
+    
+    // MARK: UITableViewDelegate
+    
+    @objc dynamic func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        
+        self.setSelectedIndexPath(indexPath, scrollToSelection: false)
+    }
+    
+    
+    // MARK: Private
+    
+    private typealias ModelMetadata = (label: String, entityType: NSManagedObject.Type, schemaHistory: SchemaHistory)
+    
+    private let models: [ModelMetadata] = [
+        (
+            label: "Model V1",
+            entityType: OrganismV1.self,
+            schemaHistory: SchemaHistory(
+                XcodeDataModelSchema.from(
+                    modelName: "MigrationDemo",
+                    migrationChain: ["MigrationDemoV3", "MigrationDemoV2", "MigrationDemo"]
+                ),
+                migrationChain: ["MigrationDemoV3", "MigrationDemoV2", "MigrationDemo"]
+            )
+        ),
+        (
+            label: "Model V2",
+            entityType: OrganismV2.self,
+            schemaHistory: SchemaHistory(
+                XcodeDataModelSchema.from(
+                    modelName: "MigrationDemo",
+                    migrationChain: [
+                        "MigrationDemo": "MigrationDemoV2",
+                        "MigrationDemoV3": "MigrationDemoV2"
+                    ]
+                ),
+                migrationChain: [
+                    "MigrationDemo": "MigrationDemoV2",
+                    "MigrationDemoV3": "MigrationDemoV2"
+                ]
+            )
+        ),
+        (
+            label: "Model V3",
+            entityType: OrganismV3.self,
+            schemaHistory: SchemaHistory(
+                XcodeDataModelSchema.from(
+                    modelName: "MigrationDemo",
+                    migrationChain: ["MigrationDemo", "MigrationDemoV2", "MigrationDemoV3"]
+                ),
+                migrationChain: ["MigrationDemo", "MigrationDemoV2", "MigrationDemoV3"]
+            )
+        )
+    ]
+    
+    private var _listMonitor: ListMonitor<NSManagedObject>?
+    private var listMonitor: ListMonitor<NSManagedObject>? {
+        
+        return self._listMonitor
+    }
+    
+    private var _dataStack: DataStack?
+    private var dataStack: DataStack? {
+        
+        return self._dataStack
+    }
+    
+    private var _lastSelectedIndexPath: IndexPath?
+    private var lastSelectedIndexPath: IndexPath? {
+        
+        return self._lastSelectedIndexPath
+    }
+    
+    private func setSelectedIndexPath(_ indexPath: IndexPath, scrollToSelection: Bool) {
+        
+        self._lastSelectedIndexPath = indexPath
+        self.updateDisplay(reloadData: false, scrollToSelection: scrollToSelection, animated: true)
+    }
+    
+    @IBOutlet private dynamic weak var headerContainer: UIView?
+    @IBOutlet private dynamic weak var titleLabel: UILabel?
+    @IBOutlet private dynamic weak var organismLabel: UILabel?
+    @IBOutlet private dynamic weak var segmentedControl: UISegmentedControl?
+    @IBOutlet private dynamic weak var progressView: UIProgressView?
+    @IBOutlet private dynamic weak var tableView: UITableView?
+    
+    @IBAction private dynamic func segmentedControlValueChanged(_ sender: AnyObject?) {
+        
+        guard let index = self.segmentedControl?.selectedSegmentIndex else {
+            
+            return
+        }
+        
+        self.selectModelVersion(self.models[index])
+    }
+    
+    private func selectModelVersion(_ model: ModelMetadata) {
+        
+        if self.dataStack?.modelVersion == model.schemaHistory.currentModelVersion {
+            
+            return
+        }
+        
+        self.set(dataStack: nil, model: nil, scrollToSelection: false) // explicitly trigger NSPersistentStore cleanup by deallocating the stack
+        
+        let dataStack = DataStack(schemaHistory: model.schemaHistory)
+        
+        self.setEnabled(false)
+        let progress = dataStack.addStorage(
+            SQLiteStore(
+                fileName: "MigrationDemo.sqlite",
+                migrationMappingProviders: [
+                    CustomSchemaMappingProvider(
+                        from: "MigrationDemoV3",
+                        to: "MigrationDemoV2",
+                        entityMappings: [
+                            .transformEntity(
+                                sourceEntity: "Organism",
+                                destinationEntity: "Organism",
+                                transformer: { (source, createDestination) in
+                                    
+                                    let destination = createDestination()
+                                    destination.enumerateAttributes { (attribute, sourceAttribute) in
+                                        
+                                        if let sourceAttribute = sourceAttribute {
+                                            
+                                            destination[attribute] = source[sourceAttribute]
+                                        }
+                                    }
+                                    destination["numberOfFlippers"] = source["numberOfLimbs"]
+                                }
+                            )
+                        ]
+                    )
+                ]
+            ),
+            completion: { [weak self] (result) -> Void in
+                
+                guard let `self` = self else {
+                    
+                    return
+                }
+                
+                guard case .success = result else {
+                    
+                    self.setEnabled(true)
+                    return
+                }
+                
+                self.set(dataStack: dataStack, model: model, scrollToSelection: true)
+                
+                let count = try! dataStack.queryValue(
+                    From<NSManagedObject>(model.entityType)
+                        .select(Int.self, .count(#keyPath(OrganismV1.dna))))!
+                if count > 0 {
+                    
+                    self.setEnabled(true)
+                }
+                else {
+                    
+                    for i: Int64 in 0 ..< 20 {
+                        
+                        dataStack.perform(
+                            asynchronous: { (transaction) in
+                                
+                                for j: Int64 in 0 ..< 500 {
+                                    
+                                    let organism = transaction.create(Into(model.entityType)) as! OrganismProtocol
+                                    organism.dna = (i * 500) + j + 1
+                                    organism.mutate()
+                                }
+                            },
+                            completion: { _ in }
+                        )
+                    }
+                    dataStack.perform(
+                        asynchronous: { _ in },
+                        completion: { [weak self] _ in
+                    
+                            self?.setEnabled(true)
+                        }
+                    )
+                }
+            }
+        )
+        
+        if let progress = progress {
+            
+            progress.setProgressHandler { [weak self] (progress) -> Void in
+                
+                self?.reloadTableHeaderWithProgress(progress)
+            }
+        }
+    }
+    
+    private func setEnabled(_ enabled: Bool) {
+        
+        UIView.animate(
+            withDuration: 0.2,
+            delay: 0,
+            options: .beginFromCurrentState,
+            animations: { () -> Void in
+                
+                let navigationItem = self.navigationItem
+                navigationItem.leftBarButtonItem?.isEnabled = enabled
+                navigationItem.rightBarButtonItem?.isEnabled = enabled
+                navigationItem.hidesBackButton = !enabled
+                
+                self.segmentedControl?.isEnabled = enabled
+                
+                if let tableView = self.tableView {
+                    
+                    tableView.alpha = enabled ? 1.0 : 0.5
+                    tableView.isUserInteractionEnabled = enabled
+                }
+            },
+            completion: nil
+        )
+    }
+    
+    private func set(dataStack: DataStack?, model: ModelMetadata?, scrollToSelection: Bool) {
+        
+        if let dataStack = dataStack, let model = model {
+            
+            self.segmentedControl?.selectedSegmentIndex = self.models
+                .firstIndex(
+                    where: { (arg) -> Bool in
+                        
+                        let (_, _, schemaHistory) = arg
+                        return schemaHistory.currentModelVersion == model.schemaHistory.currentModelVersion
+                    }
+                )!
+            
+            self._dataStack = dataStack
+            let listMonitor = dataStack.monitorList(
+                From(model.entityType),
+                OrderBy<NSManagedObject>(.descending(#keyPath(OrganismV1.dna)))
+            )
+            listMonitor.addObserver(self)
+            self._listMonitor = listMonitor
+            
+            if self.lastSelectedIndexPath == nil  {
+                
+                if listMonitor.numberOfObjects(in: 0) > 0 {
+                    
+                    self.setSelectedIndexPath(IndexPath(row: 0, section: 0), scrollToSelection: true)
+                }
+            }
+        }
+        else {
+           
+            self.segmentedControl?.selectedSegmentIndex = UISegmentedControl.noSegment
+            self._listMonitor = nil
+            self._dataStack = nil
+        }
+        
+        self.updateDisplay(reloadData: true, scrollToSelection: scrollToSelection, animated: false)
+    }
+    
+    private func reloadTableHeaderWithProgress(_ progress: Progress) {
+        
+        self.progressView?.setProgress(Float(progress.fractionCompleted), animated: true)
+        self.titleLabel?.text = "Migrating: \(progress.localizedDescription ?? "")"
+        self.organismLabel?.text = "Progressive step \(progress.localizedAdditionalDescription ?? "")"
+    }
+    
+    private func updateDisplay(reloadData: Bool, scrollToSelection: Bool, animated: Bool) {
+        
+        var lines = [String]()
+        var organismType = ""
+        if let indexPath = self.lastSelectedIndexPath, let organism = self.listMonitor?[indexPath] {
+            
+            for property in organism.entity.properties {
+                
+                let value = organism.value(forKey: property.name) ?? NSNull()
+                lines.append("\(property.name): \(value)")
+            }
+            organismType = organism.entity.managedObjectClassName
+        }
+        
+        self.titleLabel?.text = organismType
+        self.organismLabel?.text = lines.joined(separator: "\n")
+        self.progressView?.progress = 0
+        
+        self.headerContainer?.setNeedsLayout()
+        
+        guard let tableView = self.tableView else {
+            
+            return
+        }
+        
+        if reloadData {
+            
+            tableView.reloadData()
+        }
+        
+        tableView.layoutIfNeeded()
+        
+        if let indexPath = self.lastSelectedIndexPath,
+            indexPath.row < tableView.numberOfRows(inSection: 0) {
+            
+            tableView.selectRow(at: indexPath,
+                animated: scrollToSelection && animated,
+                scrollPosition: scrollToSelection ? .middle : .none
+            )
+        }
+    }
+}
--- a/Demo/MyAppModel.xcdatamodeld/.xccurrentversion
+++ b/Demo/MyAppModel.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>
--- a/Demo/MyAppModel.xcdatamodeld/MyAppModel.xcdatamodel/contents
+++ b/Demo/MyAppModel.xcdatamodeld/MyAppModel.xcdatamodel/contents
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model userDefinedModelVersionIdentifier="" type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="8166.2" systemVersion="14E46" minimumToolsVersion="Xcode 7.0">
+    <elements/>
+</model>
--- a/LegacyDemo/LegacyDemo/MIgrations
+++ b/LegacyDemo/LegacyDemo/MIgrations
@@ -0,0 +1,16 @@
+//
+//  OrganismProtocol.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/27.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+
+protocol OrganismProtocol: AnyObject {
+    
+    var dna: Int64 { get set }
+    
+    func mutate()
+}
--- a/Demo/OrganismTableViewCell.swift
+++ b/Demo/OrganismTableViewCell.swift
@@ -0,0 +1,22 @@
+//
+//  OrganismTableViewCell.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/07/12.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+
+class OrganismTableViewCell: UITableViewCell {
+
+    @IBOutlet weak dynamic var dnaLabel: UILabel?
+    @IBOutlet weak dynamic var mutateButton: UIButton?
+    
+    var mutateButtonHandler: (() -> Void)?
+
+    @IBAction dynamic func mutateButtonTouchUpInside(_ sender: UIButton?) {
+     
+        self.mutateButtonHandler?()
+    }
+}
--- a/LegacyDemo/LegacyDemo/MIgrations
+++ b/LegacyDemo/LegacyDemo/MIgrations
@@ -0,0 +1,25 @@
+//
+//  OrganismV1.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/21.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+class OrganismV1: NSManagedObject, OrganismProtocol {
+
+    @NSManaged var dna: Int64
+    @NSManaged var hasHead: Bool
+    @NSManaged var hasTail: Bool
+    
+    // MARK: OrganismProtocol
+    
+    func mutate() {
+        
+        self.hasHead = arc4random_uniform(2) == 1
+        self.hasTail = arc4random_uniform(2) == 1
+    }
+}
--- a/LegacyDemo/LegacyDemo/MIgrations
+++ b/LegacyDemo/LegacyDemo/MIgrations
@@ -0,0 +1,27 @@
+//
+//  OrganismV2.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/21.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+class OrganismV2: NSManagedObject, OrganismProtocol {
+    
+    @NSManaged var dna: Int64
+    @NSManaged var hasHead: Bool
+    @NSManaged var hasTail: Bool
+    @NSManaged var numberOfFlippers: Int32
+    
+    // MARK: OrganismProtocol
+    
+    func mutate() {
+        
+        self.hasHead = arc4random_uniform(2) == 1
+        self.hasTail = arc4random_uniform(2) == 1
+        self.numberOfFlippers = Int32(arc4random_uniform(9) / 2 * 2)
+    }
+}
--- a/Demo/OrganismV2ToV3.xcmappingmodel/xcmapping.xml
+++ b/Demo/OrganismV2ToV3.xcmappingmodel/xcmapping.xml
--- a/Demo/OrganismV2ToV3MigrationPolicy.swift
+++ b/Demo/OrganismV2ToV3MigrationPolicy.swift
@@ -0,0 +1,29 @@
+//
+//  OrganismV2ToV3MigrationPolicy.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/27.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import CoreData
+
+class OrganismV2ToV3MigrationPolicy: NSEntityMigrationPolicy {
+    
+    override func createDestinationInstances(forSource sInstance: NSManagedObject, in mapping: NSEntityMapping, manager: NSMigrationManager) throws {
+        
+        try super.createDestinationInstances(forSource: sInstance, in: mapping, manager: manager)
+        
+        for dInstance in manager.destinationInstances(forEntityMappingName: mapping.name, sourceInstances: [sInstance]) {
+            
+            dInstance.setValue(
+                false,
+                forKey: #keyPath(OrganismV3.hasVertebrae)
+            )
+            dInstance.setValue(
+                sInstance.value(forKey: #keyPath(OrganismV2.numberOfFlippers)),
+                forKey: #keyPath(OrganismV3.numberOfLimbs)
+            )
+        }
+    }
+}
--- a/LegacyDemo/LegacyDemo/MIgrations
+++ b/LegacyDemo/LegacyDemo/MIgrations
@@ -0,0 +1,29 @@
+//
+//  OrganismV3.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/27.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+class OrganismV3: NSManagedObject, OrganismProtocol {
+    
+    @NSManaged var dna: Int64
+    @NSManaged var hasHead: Bool
+    @NSManaged var hasTail: Bool
+    @NSManaged var numberOfLimbs: Int32
+    @NSManaged var hasVertebrae: Bool
+    
+    // MARK: OrganismProtocol
+    
+    func mutate() {
+        
+        self.hasHead = arc4random_uniform(2) == 1
+        self.hasTail = arc4random_uniform(2) == 1
+        self.numberOfLimbs = Int32(arc4random_uniform(9) / 2 * 2)
+        self.hasVertebrae = arc4random_uniform(2) == 1
+    }
+}
--- a/Demo/OrganismV3ToV2.xcmappingmodel/xcmapping.xml
+++ b/Demo/OrganismV3ToV2.xcmappingmodel/xcmapping.xml
--- a/LegacyDemo/LegacyDemo/MigrationDemo.xcdatamodeld/.xccurrentversion
+++ b/LegacyDemo/LegacyDemo/MigrationDemo.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>MigrationDemoV3.xcdatamodel</string>
+</dict>
+</plist>
--- a/LegacyDemo/LegacyDemo/MigrationDemo.xcdatamodeld/MigrationDemo.xcdatamodel/contents
+++ b/LegacyDemo/LegacyDemo/MigrationDemo.xcdatamodeld/MigrationDemo.xcdatamodel/contents
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="11198.3" systemVersion="15F34" minimumToolsVersion="Xcode 4.3" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Organism" representedClassName="LegacyDemo.OrganismV1" syncable="YES">
+        <attribute name="dna" optional="YES" attributeType="Integer 64" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="hasHead" optional="YES" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="hasTail" optional="YES" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
+    </entity>
+    <elements>
+        <element name="Organism" positionX="-36" positionY="9" width="128" height="90"/>
+    </elements>
+</model>
--- a/LegacyDemo/LegacyDemo/MigrationDemo.xcdatamodeld/MigrationDemoV2.xcdatamodel/contents
+++ b/LegacyDemo/LegacyDemo/MigrationDemo.xcdatamodeld/MigrationDemoV2.xcdatamodel/contents
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="11198.3" systemVersion="15F34" minimumToolsVersion="Xcode 4.3" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Organism" representedClassName="LegacyDemo.OrganismV2" syncable="YES">
+        <attribute name="dna" optional="YES" attributeType="Integer 64" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="hasHead" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="hasTail" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="numberOfFlippers" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="NO" syncable="YES"/>
+    </entity>
+    <elements>
+        <element name="Organism" positionX="-36" positionY="9" width="128" height="105"/>
+    </elements>
+</model>
--- a/LegacyDemo/LegacyDemo/MigrationDemo.xcdatamodeld/MigrationDemoV3.xcdatamodel/contents
+++ b/LegacyDemo/LegacyDemo/MigrationDemo.xcdatamodeld/MigrationDemoV3.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="12141" systemVersion="16E195" minimumToolsVersion="Xcode 4.3" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Organism" representedClassName="LegacyDemo.OrganismV3" syncable="YES">
+        <attribute name="dna" optional="YES" attributeType="Integer 64" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="hasHead" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="hasTail" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="hasVertebrae" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
+        <attribute name="numberOfLimbs" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="NO" elementID="numberOfFlippers" syncable="YES"/>
+    </entity>
+    <elements>
+        <element name="Organism" positionX="-36" positionY="9" width="128" height="120"/>
+    </elements>
+</model>
--- a/LegacyDemo/LegacyDemo/Stack
+++ b/LegacyDemo/LegacyDemo/Stack
@@ -0,0 +1,15 @@
+//
+//  FemaleAccount.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/06.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+class FemaleAccount: UserAccount {
+
+
+}
--- a/LegacyDemo/LegacyDemo/Stack
+++ b/LegacyDemo/LegacyDemo/Stack
@@ -0,0 +1,15 @@
+//
+//  MaleAccount.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/06/06.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+class MaleAccount: UserAccount {
+
+
+}
--- a/Demo/StackSetupDemoViewController.swift
+++ b/Demo/StackSetupDemoViewController.swift
@@ -0,0 +1,196 @@
+//
+//  StackSetupDemoViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/24.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import CoreStore
+
+
+private struct Static {
+    
+    static let maleConfiguration = "MaleAccounts"
+    static let femaleConfiguration = "FemaleAccounts"
+    
+    static let facebookStack: DataStack = {
+        
+        let dataStack = DataStack(xcodeModelName: "StackSetupDemo")
+        try! dataStack.addStorageAndWait(
+            SQLiteStore(
+                fileName: "AccountsDemo_FB_Male.sqlite",
+                configuration: maleConfiguration,
+                localStorageOptions: .recreateStoreOnModelMismatch
+            )
+        )
+        try! dataStack.addStorageAndWait(
+            SQLiteStore(
+                fileName: "AccountsDemo_FB_Female.sqlite",
+                configuration: femaleConfiguration,
+                localStorageOptions: .recreateStoreOnModelMismatch
+            )
+        )
+        
+        _ = try? dataStack.perform(
+            synchronous: { (transaction) in
+                
+                try transaction.deleteAll(From<UserAccount>())
+                
+                let account1 = transaction.create(Into<MaleAccount>(maleConfiguration))
+                account1.accountType = "Facebook"
+                account1.name = "John Smith HCD"
+                account1.friends = 42
+                
+                let account2 = transaction.create(Into<FemaleAccount>(femaleConfiguration))
+                account2.accountType = "Facebook"
+                account2.name = "Jane Doe HCD"
+                account2.friends = 314
+            }
+        )
+        
+        return dataStack
+    }()
+    
+    static let twitterStack: DataStack = {
+        
+        let dataStack = DataStack(xcodeModelName: "StackSetupDemo")
+        try! dataStack.addStorageAndWait(
+            SQLiteStore(
+                fileName: "AccountsDemo_TW_Male.sqlite",
+                configuration: maleConfiguration,
+                localStorageOptions: .recreateStoreOnModelMismatch
+            )
+        )
+        try! dataStack.addStorageAndWait(
+            SQLiteStore(
+                fileName: "AccountsDemo_TW_Female.sqlite",
+                configuration: femaleConfiguration,
+                localStorageOptions: .recreateStoreOnModelMismatch
+            )
+        )
+        
+        _ = try? dataStack.perform(
+            synchronous: { (transaction) in
+                
+                try transaction.deleteAll(From<UserAccount>())
+                
+                let account1 = transaction.create(Into<MaleAccount>(maleConfiguration))
+                account1.accountType = "Twitter"
+                account1.name = "#johnsmith_hcd"
+                account1.friends = 7
+                
+                let account2 = transaction.create(Into<FemaleAccount>(femaleConfiguration))
+                account2.accountType = "Twitter"
+                account2.name = "#janedoe_hcd"
+                account2.friends = 100
+            }
+        )
+        return dataStack
+    }()
+}
+
+
+
+
+// MARK: - StackSetupDemoViewController
+
+class StackSetupDemoViewController: UITableViewController {
+    
+    let accounts = [
+        try! Static.facebookStack.fetchAll(From<UserAccount>()),
+        try! Static.twitterStack.fetchAll(From<UserAccount>())
+    ]
+    
+    
+    // MARK: UIViewController
+    
+    override func viewWillAppear(_ animated: Bool) {
+        
+        super.viewWillAppear(animated)
+        
+        self.tableView.reloadData()
+        
+        let indexPath = IndexPath(row: 0, section: 0)
+        self.tableView.selectRow(at: indexPath, animated: false, scrollPosition: .none)
+        self.updateDetails(account: self.accounts[indexPath.section][indexPath.row])
+    }
+    
+    override func viewDidAppear(_ animated: Bool) {
+        
+        super.viewDidAppear(animated)
+        
+        let alert = UIAlertController(
+            title: "Setup Demo",
+            message: "This demo shows how to initialize 2 DataStacks with 2 configurations each, for a total of 4 SQLite files, each with 1 instance of a \"UserAccount\" entity.",
+            preferredStyle: .alert
+        )
+        alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+        self.present(alert, animated: true, completion: nil)
+    }
+    
+    
+    // MARK: UITableViewDataSource
+    
+    override func numberOfSections(in tableView: UITableView) -> Int {
+        
+        return self.accounts.count
+    }
+    
+    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        
+        return self.accounts[section].count
+    }
+    
+    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        
+        let cell = tableView.dequeueReusableCell(withIdentifier: "UITableViewCell")!
+        
+        let account = self.accounts[indexPath.section][indexPath.row]
+        cell.textLabel?.text = account.name
+        cell.detailTextLabel?.text = "\(account.friends) friends"
+        
+        return cell
+    }
+    
+    
+    // MARK: UITableViewDelegate
+    
+    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        
+        let account = self.accounts[indexPath.section][indexPath.row]
+        self.updateDetails(account: account)
+    }
+    
+    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
+        
+        switch section {
+            
+        case 0:
+            let count = self.accounts[section].count
+            return "Facebook Accounts (\(count) users)"
+            
+        case 1:
+            let count = self.accounts[section].count
+            return "Twitter Accounts (\(count) users)"
+            
+        default:
+            return nil
+        }
+    }
+    
+    
+    // MARK: Private
+    
+    @IBOutlet private dynamic weak var accountTypeLabel: UILabel?
+    @IBOutlet private dynamic weak var nameLabel: UILabel?
+    @IBOutlet private dynamic weak var friendsLabel: UILabel?
+    
+    private func updateDetails(account: UserAccount) {
+        
+        self.accountTypeLabel?.text = account.accountType
+        self.nameLabel?.text = account.name
+        self.friendsLabel?.text = "\(account.friends) friends"
+    }
+}
--- a/LegacyDemo/LegacyDemo/Stack
+++ b/LegacyDemo/LegacyDemo/Stack
@@ -0,0 +1,20 @@
+//
+//  UserAccount.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/24.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+
+// MARK: - UserAccount
+
+class UserAccount: NSManagedObject {
+    
+    @NSManaged var accountType: String?
+    @NSManaged var name: String?
+    @NSManaged var friends: Int32
+}
--- a/LegacyDemo/LegacyDemo/StackSetupDemo.xcdatamodeld/StackSetupDemo.xcdatamodel/contents
+++ b/LegacyDemo/LegacyDemo/StackSetupDemo.xcdatamodeld/StackSetupDemo.xcdatamodel/contents
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model userDefinedModelVersionIdentifier="" type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="7701" systemVersion="14D136" minimumToolsVersion="Xcode 4.3" macOSVersion="Automatic" iOSVersion="Automatic">
+    <entity name="FemaleAccount" representedClassName="LegacyDemo.FemaleAccount" parentEntity="UserAccount" syncable="YES"/>
+    <entity name="MaleAccount" representedClassName="LegacyDemo.MaleAccount" parentEntity="UserAccount" syncable="YES"/>
+    <entity name="UserAccount" representedClassName="LegacyDemo.UserAccount" isAbstract="YES" syncable="YES">
+        <attribute name="accountType" optional="YES" attributeType="String" syncable="YES"/>
+        <attribute name="friends" optional="YES" attributeType="Integer 32" defaultValueString="0" syncable="YES"/>
+        <attribute name="name" optional="YES" attributeType="String" syncable="YES"/>
+    </entity>
+    <configuration name="FemaleAccounts">
+        <memberEntity name="FemaleAccount"/>
+        <memberEntity name="UserAccount"/>
+    </configuration>
+    <configuration name="MaleAccounts">
+        <memberEntity name="MaleAccount"/>
+        <memberEntity name="UserAccount"/>
+    </configuration>
+    <elements>
+        <element name="UserAccount" positionX="-63" positionY="-18" width="128" height="90"/>
+        <element name="MaleAccount" positionX="-54" positionY="18" width="128" height="45"/>
+        <element name="FemaleAccount" positionX="-36" positionY="27" width="128" height="45"/>
+    </elements>
+</model>
--- a/Demo/SwiftUIContainerViewController.swift
+++ b/Demo/SwiftUIContainerViewController.swift
@@ -0,0 +1,53 @@
+//
+//  SwiftUIContainerViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2019/10/02.
+//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import CoreStore
+
+#if canImport(SwiftUI)
+import SwiftUI
+
+#endif
+
+#if canImport(Combine)
+import Combine
+
+#endif
+
+import Compression
+final class SwiftUIContainerViewController: UIViewController {
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        #if canImport(SwiftUI) && canImport(Combine)
+        
+        if #available(iOS 13, *) {
+            
+            let hostingController = UIHostingController(
+                rootView: SwiftUIView(
+                    palettes: ColorsDemo.stack.publishList(
+                        From<Palette>()
+                            .sectionBy(\.$colorName)
+                            .orderBy(.ascending(\.$hue))
+                    )
+                )
+                .environment(\.dataStack, ColorsDemo.stack)
+            )
+            self.addChild(hostingController)
+            
+            hostingController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+            hostingController.view.frame = self.view.bounds.inset(by: self.view.safeAreaInsets)
+            self.view.addSubview(hostingController.view)
+            
+            hostingController.didMove(toParent: self)
+        }
+
+        #endif
+    }
+}
--- a/LegacyDemo/LegacyDemo/SwiftUI
+++ b/LegacyDemo/LegacyDemo/SwiftUI
@@ -0,0 +1,183 @@
+//
+//  SwiftUIView.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2019/10/02.
+//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+
+#if canImport(SwiftUI) && canImport(Combine)
+import SwiftUI
+import Combine
+
+import CoreStore
+
+
+@available(iOS 13.0.0, *)
+struct SwiftUIView: View {
+    
+    @Environment(\.dataStack)
+    var dataStack: DataStack
+
+    @ObservedObject
+    var palettes: ListPublisher<Palette>
+
+    var body: some View {
+        NavigationView {
+            List {
+                ForEach(palettes.snapshot.sectionIDs, id: \.self) { (sectionID) in
+                    Section(header: Text(sectionID)) {
+                        ForEach(self.palettes.snapshot.items(inSectionWithID: sectionID), id: \.self) { palette in
+                            NavigationLink(
+                                destination: DetailView(palette: palette),
+                                label: { ColorCell(palette: palette) }
+                            )
+                        }
+                        .onDelete { itemIndices in
+                            let objectIDsToDelete = self.palettes.snapshot.itemIDs(
+                                inSectionWithID: sectionID,
+                                atIndices: itemIndices
+                            )
+                            self.dataStack.perform(
+                                asynchronous: { transaction in
+
+                                    transaction.delete(objectIDs: objectIDsToDelete)
+                                },
+                                completion: { _ in }
+                            )
+                        }
+                    }
+                }
+            }
+            .navigationBarTitle(Text("SwiftUI (\(palettes.snapshot.numberOfItems) objects)"))
+            .navigationBarItems(
+                leading: EditButton(),
+                trailing: HStack {
+                    Button(
+                        action: {
+
+                            self.dataStack.perform(
+                                asynchronous: { transaction in
+
+                                    for palette in try transaction.fetchAll(From<Palette>()) {
+
+                                        palette.hue = Palette.randomHue()
+                                        palette.colorName = nil
+                                    }
+                                },
+                                completion: { _ in }
+                            )
+                        },
+                        label: {
+                            Image(systemName: "goforward")
+                        }
+                    )
+                    .frame(width: 30)
+                    Button(
+                        action: {
+
+                            self.dataStack.perform(
+                                asynchronous: { transaction in
+
+                                    _ = transaction.create(Into<Palette>())
+                                },
+                                completion: { _ in }
+                            )
+                        },
+                        label: {
+                            Image(systemName: "plus")
+                        }
+                    )
+                    .frame(width: 30)
+                }
+            )
+            .alert(
+                isPresented: $needsShowAlert,
+                content: {
+                    Alert(
+                        title: Text("SwiftUI Binding Demo"),
+                        message: Text("This demo shows how to bind to ListPublisher and to CoreStoreObject when using SwiftUI"),
+                        dismissButton: .cancel(Text("OK"))
+                    )
+                }
+            )
+            .onAppear {
+                
+                self.needsShowAlert = true
+            }
+        }
+    }
+
+    @State
+    private var needsShowAlert = false
+}
+
+@available(iOS 13.0.0, *)
+struct ColorCell: View {
+
+    @ObservedObject
+    var palette: ObjectPublisher<Palette>
+
+    var body: some View {
+        HStack {
+            Color(palette.color ?? UIColor.clear)
+                .cornerRadius(5)
+                .frame(width: 30, height: 30, alignment: .leading)
+            Text(palette.colorText ?? "<Deleted>")
+        }
+    }
+}
+
+@available(iOS 13.0.0, *)
+struct DetailView: View {
+
+    @Environment(\.dataStack)
+    var dataStack: DataStack
+
+    @ObservedObject
+    var palette: ObjectPublisher<Palette>
+
+    @State var hue: Float = 0
+    @State var saturation: Float = 0
+    @State var brightness: Float = 0
+
+    init(palette: ObjectPublisher<Palette>) {
+
+        self.palette = palette
+        self.hue = Float(palette.hue ?? 0)
+        self.saturation = palette.saturation ?? 0
+        self.brightness = palette.brightness ?? 0
+    }
+
+    var body: some View {
+        ZStack {
+            Color(palette.color ?? UIColor.clear)
+                .cornerRadius(20)
+                .padding(20)
+            VStack {
+                Text(palette.colorText ?? "<Deleted>")
+                    .navigationBarTitle(Text("Color"))
+                Slider(value: $hue, in: 0.0 ... 359.0 as ClosedRange<Float>)
+                Slider(value: $saturation, in: 0.0 ... 1.0 as ClosedRange<Float>)
+                Slider(value: $brightness, in: 0.0 ... 0.1 as ClosedRange<Float>)
+            }
+        }
+    }
+}
+
+@available(iOS 13.0.0, *)
+struct SwiftUIView_Previews: PreviewProvider {
+    
+    static var previews: some View {
+        SwiftUIView(
+            palettes: ColorsDemo.stack.publishList(
+                From<Palette>()
+                    .sectionBy(\.$colorName)
+                    .orderBy(.ascending(\.$hue))
+            )
+        )
+        .environment(\.dataStack, ColorsDemo.stack)
+    }
+}
+
+#endif
--- a/LegacyDemo/LegacyDemo/Transactions
+++ b/LegacyDemo/LegacyDemo/Transactions
@@ -0,0 +1,50 @@
+//
+//  Place.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/24.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import Foundation
+import CoreData
+import MapKit
+
+
+// MARK: - Place
+
+class Place: NSManagedObject, MKAnnotation {
+
+    @NSManaged var latitude: Double
+    @NSManaged var longitude: Double
+    @NSManaged var title: String?
+    @NSManaged var subtitle: String?
+    
+    func setInitialValues() {
+        
+        self.latitude = Double(arc4random_uniform(180)) - 90
+        self.longitude = Double(arc4random_uniform(360)) - 180
+        self.title = "\(self.latitude), \(self.longitude)"
+        self.subtitle = nil
+    }
+    
+    // MARK: MKAnnotation
+    
+    var coordinate: CLLocationCoordinate2D {
+    
+        get {
+            
+            return CLLocationCoordinate2DMake(
+                self.latitude,
+                self.longitude
+            )
+        }
+        set {
+            
+            self.latitude = newValue.latitude
+            self.longitude = newValue.longitude
+            self.title = "\(self.latitude), \(self.longitude)"
+            self.subtitle = nil
+        }
+    }
+}
--- a/Demo/TransactionsDemoViewController.swift
+++ b/Demo/TransactionsDemoViewController.swift
@@ -0,0 +1,233 @@
+//
+//  TransactionsDemoViewController.swift
+//  LegacyDemo
+//
+//  Created by John Rommel Estropia on 2015/05/24.
+//  Copyright © 2018 John Rommel Estropia. All rights reserved.
+//
+
+import UIKit
+import Contacts
+import CoreLocation
+import MapKit
+import AddressBookUI
+import CoreStore
+
+
+private struct Static {
+
+    static let dataStack = DataStack()
+
+    static let placeController: ObjectMonitor<Place> = {
+        
+        try! Static.dataStack.addStorageAndWait(
+            SQLiteStore(
+                fileName: "PlaceDemo.sqlite",
+                configuration: "TransactionsDemo",
+                localStorageOptions: .recreateStoreOnModelMismatch
+            )
+        )
+        
+        var place = try! Static.dataStack.fetchOne(From<Place>())
+        if place == nil {
+            
+            _ = try? Static.dataStack.perform(
+                synchronous: { (transaction) in
+                    
+                    let place = transaction.create(Into<Place>())
+                    place.setInitialValues()
+                }
+            )
+            place = try! Static.dataStack.fetchOne(From<Place>())
+        }
+        
+        return Static.dataStack.monitorObject(place!)
+    }()
+}
+
+
+// MARK: - TransactionsDemoViewController
+
+class TransactionsDemoViewController: UIViewController, MKMapViewDelegate, ObjectObserver {
+    
+    // MARK: NSObject
+    
+    deinit {
+        
+        Static.placeController.removeObserver(self)
+    }
+    
+    
+    // MARK: UIViewController
+    
+    override func viewDidLoad() {
+        
+        super.viewDidLoad()
+        
+        let longPressGesture = UILongPressGestureRecognizer(
+            target: self,
+            action: #selector(self.longPressGestureRecognized(_:))
+        )
+        self.mapView?.addGestureRecognizer(longPressGesture)
+        
+        Static.placeController.addObserver(self)
+        
+        self.navigationItem.rightBarButtonItem = UIBarButtonItem(
+            barButtonSystemItem: .refresh,
+            target: self,
+            action: #selector(self.refreshButtonTapped(_:))
+        )
+    }
+    
+    override func viewDidAppear(_ animated: Bool) {
+        
+        super.viewDidAppear(animated)
+        
+        let alert = UIAlertController(
+            title: "Transactions Demo",
+            message: "This demo shows how to use the 3 types of transactions to save updates: synchronous, asynchronous, and unsafe.\n\nTap and hold on the map to change the pin location.",
+            preferredStyle: .alert
+        )
+        alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+        self.present(alert, animated: true, completion: nil)
+    }
+    
+    override func viewWillAppear(_ animated: Bool) {
+        
+        super.viewWillAppear(animated)
+        
+        if let mapView = self.mapView, let place = Static.placeController.object {
+            
+            mapView.addAnnotation(place)
+            mapView.setCenter(place.coordinate, animated: false)
+            mapView.selectAnnotation(place, animated: false)
+        }
+    }
+    
+    
+    // MARK: MKMapViewDelegate
+    
+    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
+        
+        let identifier = "MKAnnotationView"
+        var annotationView: MKPinAnnotationView! = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) as? MKPinAnnotationView
+        if annotationView == nil {
+            
+            annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
+            annotationView.isEnabled = true
+            annotationView.canShowCallout = true
+            annotationView.animatesDrop = true
+        }
+        else {
+            
+            annotationView.annotation = annotation
+        }
+        
+        return annotationView
+    }
+    
+    
+    // MARK: ObjectObserver
+    
+    func objectMonitor(_ monitor: ObjectMonitor<Place>, willUpdateObject object: Place) {
+        
+        // none
+    }
+    
+    func objectMonitor(_ monitor: ObjectMonitor<Place>, didUpdateObject object: Place, changedPersistentKeys: Set<KeyPathString>) {
+        
+        if let mapView = self.mapView {
+            
+            mapView.removeAnnotations(mapView.annotations)
+            mapView.addAnnotation(object)
+            mapView.setCenter(object.coordinate, animated: true)
+            mapView.selectAnnotation(object, animated: true)
+            
+            if changedPersistentKeys.contains(#keyPath(Place.latitude)) || changedPersistentKeys.contains(#keyPath(Place.longitude)) {
+                
+                self.geocode(place: object)
+            }
+        }
+    }
+    
+    func objectMonitor(_ monitor: ObjectMonitor<Place>, didDeleteObject object: Place) {
+        
+        // none
+    }
+
+    
+    // MARK: Private
+    
+    var geocoder: CLGeocoder?
+    
+    @IBOutlet weak var mapView: MKMapView?
+    
+    @IBAction dynamic func longPressGestureRecognized(_ sender: AnyObject?) {
+        
+        if let mapView = self.mapView,
+            let gesture = sender as? UILongPressGestureRecognizer,
+            gesture.state == .began {
+            
+            let coordinate = mapView.convert(
+                gesture.location(in: mapView),
+                toCoordinateFrom: mapView
+            )
+            Static.dataStack.perform(
+                asynchronous: { (transaction) in
+                    
+                    let place = transaction.edit(Static.placeController.object)
+                    place?.coordinate = coordinate
+                },
+                completion: { _ in }
+            )
+        }
+    }
+    
+    @IBAction dynamic func refreshButtonTapped(_ sender: AnyObject?) {
+        
+        _ = try? Static.dataStack.perform(
+            synchronous: { (transaction) in
+                
+                let place = transaction.edit(Static.placeController.object)
+                place?.setInitialValues()
+            }
+        )
+    }
+    
+    func geocode(place: Place) {
+        
+        let transaction = Static.dataStack.beginUnsafe()
+        
+        self.geocoder?.cancelGeocode()
+        
+        let geocoder = CLGeocoder()
+        self.geocoder = geocoder
+        geocoder.reverseGeocodeLocation(
+            CLLocation(latitude: place.latitude, longitude: place.longitude),
+            completionHandler: { [weak self] (placemarks, error) -> Void in
+                
+                if let placemark = placemarks?.first, let dictionary = placemark.addressDictionary {
+                    
+                    let place = transaction.edit(Static.placeController.object)
+                    place?.title = placemark.name
+                    place?.subtitle = CNPostalAddressFormatter.string(
+                        from: autoreleasepool {
+                            
+                            let address = CNMutablePostalAddress()
+                            (dictionary["Street"] as? String).flatMap({ address.street = $0 })
+                            (dictionary["State"] as? String).flatMap({ address.state = $0 })
+                            (dictionary["City"] as? String).flatMap({ address.city = $0 })
+                            (dictionary["Country"] as? String).flatMap({ address.country = $0 })
+                            (dictionary["ZIP"] as? String).flatMap({ address.postalCode = $0 })
+                            return address
+                        },
+                        style: .mailingAddress
+                    )
+                    transaction.commit { (_) -> Void in }
+                }
+                
+                self?.geocoder = nil
+            }
+        )
+    }
+}