Magical NSFetchedResultsController bugfix....

CoreStoreDemo/CoreStoreDemo/AppDelegate.swift

@@ -18,7 +18,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
     
     var window: UIWindow?
 
-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {
         
         application.statusBarStyle = .lightContent
         

CoreStoreDemo/CoreStoreDemo/Fetching and Querying Demo/FetchingAndQueryingDemoViewController.swift

@@ -27,9 +27,9 @@ private struct Static {
             
             transaction.deleteAll(From<TimeZone>())
             
-            for name in Foundation.TimeZone.knownTimeZoneNames {
+            for name in NSTimeZone.knownTimeZoneNames {
                 
-                let rawTimeZone = Foundation.TimeZone(name: name)!
+                let rawTimeZone = NSTimeZone(name: name)!
                 let cachedTimeZone = transaction.create(Into<TimeZone>())
                 
                 cachedTimeZone.name = rawTimeZone.name
@@ -73,13 +73,13 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
         self.present(alert, animated: true, completion: nil)
     }
     
-    override func prepare(for segue: UIStoryboardSegue, sender: AnyObject?) {
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
         
         super.prepare(for: segue, sender: sender)
         
         if let indexPath = sender as? IndexPath {
             
-            switch segue.destinationViewController {
+            switch segue.destination {
                 
             case let controller as FetchingResultsViewController:
                 let item = self.fetchingItems[indexPath.row]
@@ -222,7 +222,7 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
     private let queryingItems = [
         (
             title: "Number of Time Zones",
-            query: { () -> AnyObject in
+            query: { () -> Any in
                 
                 return Static.timeZonesStack.queryValue(
                     From<TimeZone>(),
@@ -232,7 +232,7 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
         ),
         (
             title: "Abbreviation For Tokyo's Time Zone",
-            query: { () -> AnyObject in
+            query: { () -> Any in
                 
                 return Static.timeZonesStack.queryValue(
                     From<TimeZone>(),
@@ -243,7 +243,7 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
         ),
         (
             title: "All Abbreviations",
-            query: { () -> AnyObject in
+            query: { () -> Any in
                 
                 return Static.timeZonesStack.queryAttributes(
                     From<TimeZone>(),
@@ -254,7 +254,7 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
         ),
         (
             title: "Number of Countries per Time Zone",
-            query: { () -> AnyObject in
+            query: { () -> Any in
                 
                 return Static.timeZonesStack.queryAttributes(
                     From<TimeZone>(),
@@ -266,7 +266,7 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
         ),
         (
             title: "Number of Countries with Summer Time",
-            query: { () -> AnyObject in
+            query: { () -> Any in
                 
                 return Static.timeZonesStack.queryAttributes(
                     From<TimeZone>(),

CoreStoreDemo/CoreStoreDemo/Fetching and Querying Demo/QueryingResultsViewController.swift

@@ -12,23 +12,23 @@ class QueryingResultsViewController: UITableViewController {
     
     // MARK: Public
     
-    func set(value: AnyObject?, title: String) {
+    func set(value: Any?, title: String) {
         
         switch value {
             
-        case (let array as [AnyObject])?:
+        case (let array as [Any])?:
-            self.values = array.map { (item: AnyObject) -> (title: String, detail: String) in
+            self.values = array.map { (item: Any) -> (title: String, detail: String) in
                 (
-                    title: item.description,
+                    title: String(describing: item),
-                    detail: String(reflecting: item.dynamicType)
+                    detail: String(reflecting: type(of: item))
                 )
             }
             
         case let item?:
             self.values = [
                 (
-                    title: item.description,
+                    title: String(describing: item),
-                    detail: String(reflecting: item.dynamicType)
+                    detail: String(reflecting: type(of: item))
                 )
             ]
             

CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/ListObserverDemoViewController.swift

@@ -14,17 +14,17 @@ private struct Static {
     
     enum Filter: String {
         
-        case All = "All Colors"
+        case all = "All Colors"
-        case Light = "Light Colors"
+        case light = "Light Colors"
-        case Dark = "Dark Colors"
+        case dark = "Dark Colors"
         
         func next() -> Filter {
             
             switch self {
                 
-            case All: return .Light
+            case .all: return .light
-            case Light: return .Dark
+            case .light: return .dark
-            case Dark: return .All
+            case .dark: return .all
             }
         }
         
@@ -32,14 +32,14 @@ private struct Static {
             
             switch self {
                 
-            case .All: return Where(true)
+            case .all: return Where(true)
-            case .Light: return Where("brightness >= 0.9")
+            case .light: return Where("brightness >= 0.9")
-            case .Dark: return Where("brightness <= 0.4")
+            case .dark: return Where("brightness <= 0.4")
             }
         }
     }
     
-    static var filter = Filter.All {
+    static var filter = Filter.all {
         
         didSet {
             
@@ -86,7 +86,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
         
         let navigationItem = self.navigationItem
         navigationItem.leftBarButtonItems = [
-            self.editButtonItem(),
+            self.editButtonItem,
             UIBarButtonItem(
                 barButtonSystemItem: .trash,
                 target: self,
@@ -115,11 +115,11 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
         self.setTable(enabled: !Static.palettes.isPendingRefetch)
     }
     
-    override func prepare(for segue: UIStoryboardSegue, sender: AnyObject?) {
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
         
         super.prepare(for: segue, sender: sender)
         
-        switch (segue.identifier, segue.destinationViewController, sender) {
+        switch (segue.identifier, segue.destination, sender) {
             
         case ("ObjectObserverDemoViewController"?, let destinationViewController as ObjectObserverDemoViewController, let palette as Palette):
             destinationViewController.palette = palette

CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/ObjectObserverDemoViewController.swift

@@ -98,7 +98,7 @@ class ObjectObserverDemoViewController: UIViewController, ObjectObserver {
         self.colorView?.alpha = 0.3
         
         self.hsbLabel?.text = "Deleted"
-        self.hsbLabel?.textColor = UIColor.red()
+        self.hsbLabel?.textColor = UIColor.red
         
         self.hueSlider?.isEnabled = false
         self.saturationSlider?.isEnabled = false

CoreStoreDemo/CoreStoreDemo/Loggers Demo/CustomLoggerViewController.swift

@@ -51,7 +51,7 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
     
     func log(level: LogLevel, message: String, fileName: StaticString, lineNumber: Int, functionName: StaticString) {
         
-        GCDQueue.main.async { [weak self] in
+        DispatchQueue.main.async { [weak self] in
             
             let levelString: String
             switch level {
@@ -61,15 +61,15 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
             case .warning: levelString = "Warning"
             case .fatal: levelString = "Fatal"
             }
-            self?.textView?.insertText("\((String(fileName) as NSString).lastPathComponent):\(lineNumber) \(functionName)\n  ↪︎ [Log:\(levelString)] \(message)\n\n")
+            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) {
         
-        GCDQueue.main.async { [weak self] in
+        DispatchQueue.main.async { [weak self] in
             
-            self?.textView?.insertText("\((String(fileName) as NSString).lastPathComponent):\(lineNumber) \(functionName)\n  ↪︎ [Error] \(message): \(error)\n\n")
+            self?.textView?.insertText("\((String(describing: fileName) as NSString).lastPathComponent):\(lineNumber) \(functionName)\n  ↪︎ [Error] \(message): \(error)\n\n")
         }
     }
     
@@ -81,9 +81,9 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
         }
         
         let messageString = message()
-        GCDQueue.main.async { [weak self] in
+        DispatchQueue.main.async { [weak self] in
             
-            self?.textView?.insertText("\((String(fileName) as NSString).lastPathComponent):\(lineNumber) \(functionName)\n  ↪︎ [Assert] \(messageString)\n\n")
+            self?.textView?.insertText("\((String(describing: fileName) as NSString).lastPathComponent):\(lineNumber) \(functionName)\n  ↪︎ [Assert] \(messageString)\n\n")
         }
     }
     

CoreStoreDemo/CoreStoreDemo/MIgrations Demo/MigrationsDemoViewController.swift

@@ -12,7 +12,7 @@ import CoreStore
 
 // MARK: - MigrationsDemoViewController
 
-class MigrationsDemoViewController: UIViewController {
+class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewDataSource, UITableViewDelegate {
     
     // MARK: UIViewController
     
@@ -72,6 +72,71 @@ class MigrationsDemoViewController: UIViewController {
         self.selectModelVersion(modelMetadata)
     }
     
+    // MARK: ListObserver
+    
+    func listMonitorWillChange(_ monitor: ListMonitor<NSManagedObject>) { }
+    
+    func listMonitorDidChange(_ monitor: ListMonitor<NSManagedObject>) {
+        
+        if self.lastSelectedIndexPath == nil,
+            let numberOfObjectsInSection = self.listMonitor?.numberOfObjectsInSection(0),
+            numberOfObjectsInSection > 0 {
+            
+            self.tableView?.reloadData()
+            self.setSelectedIndexPath(IndexPath(row: 0, section: 0), scrollToSelection: false)
+        }
+        else {
+            
+            self.updateDisplay(reloadData: true, scrollToSelection: true, animated: true)
+        }
+    }
+    
+    // MARK: UITableViewDataSource
+    
+    @objc dynamic func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        
+        return self.listMonitor?.numberOfObjectsInSection(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.beginAsynchronous { [weak self] (transaction) -> Void in
+                
+                let organism = transaction.edit(organism) as! OrganismProtocol
+                organism.mutate()
+                
+                transaction.commit { _ -> Void in
+                    
+                    self?.setEnabled(true)
+                }
+            }
+        }
+        return cell
+    }
+    
+    
+    // MARK: UITableViewDelegate
+    
+    @objc dynamic func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        
+        self.setSelectedIndexPath(indexPath, scrollToSelection: false)
+    }
+    
     
     // MARK: Private
     
@@ -176,8 +241,7 @@ class MigrationsDemoViewController: UIViewController {
                 
                 let count = dataStack.queryValue(
                     From(model.entityType),
-                    Select<Int>(.count("dna"))
+                    Select<Int>(.count("dna")))!
-                )
                 if count > 0 {
                     
                     self.setEnabled(true)
@@ -287,7 +351,7 @@ class MigrationsDemoViewController: UIViewController {
             
             for property in organism.entity.properties {
                 
-                let value: AnyObject = organism.value(forKey: property.name) ?? NSNull()
+                let value = organism.value(forKey: property.name) ?? NSNull()
                 lines.append("\(property.name): \(value)")
             }
             organismType = organism.entity.managedObjectClassName
@@ -321,78 +385,3 @@ class MigrationsDemoViewController: UIViewController {
         }
     }
 }
-
-
-// MARK: - MigrationsDemoViewController: ListObserver
-
-extension MigrationsDemoViewController: ListObserver {
-    
-    // MARK: ListObserver
-    
-    func listMonitorWillChange(_ monitor: ListMonitor<NSManagedObject>) { }
-    
-    func listMonitorDidChange(_ monitor: ListMonitor<NSManagedObject>) {
-        
-        if self.lastSelectedIndexPath == nil && self.listMonitor?.numberOfObjectsInSection(0) > 0 {
-            
-            self.tableView?.reloadData()
-            self.setSelectedIndexPath(IndexPath(row: 0, section: 0), scrollToSelection: false)
-        }
-        else {
-            
-            self.updateDisplay(reloadData: true, scrollToSelection: true, animated: true)
-        }
-    }
-}
-
-
-// MARK: - MigrationsDemoViewController: UITableViewDataSource, UITableViewDelegate
-
-extension MigrationsDemoViewController: UITableViewDataSource, UITableViewDelegate {
-    
-    // MARK: UITableViewDataSource
-    
-    @objc dynamic func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        
-        return self.listMonitor?.numberOfObjectsInSection(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.beginAsynchronous { [weak self] (transaction) -> Void in
-                
-                let organism = transaction.edit(organism) as! OrganismProtocol
-                organism.mutate()
-                
-                transaction.commit { _ -> Void in
-                    
-                    self?.setEnabled(true)
-                }
-            }
-        }
-        return cell
-    }
-    
-    
-    // MARK: UITableViewDelegate
-    
-    @objc dynamic func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
-        
-        self.setSelectedIndexPath(indexPath, scrollToSelection: false)
-    }
-}

CoreStoreDemo/CoreStoreDemo/Transactions Demo/TransactionsDemoViewController.swift

@@ -135,7 +135,7 @@ class TransactionsDemoViewController: UIViewController, MKMapViewDelegate, Objec
         
         if let mapView = self.mapView {
             
-            mapView.removeAnnotations(mapView.annotations ?? [])
+            mapView.removeAnnotations(mapView.annotations)
             mapView.addAnnotation(object)
             mapView.setCenter(object.coordinate, animated: true)
             mapView.selectAnnotation(object, animated: true)

CoreStoreTests/BaseTests/BaseTestCase.swift

@@ -97,13 +97,13 @@ class BaseTestCase: XCTestCase {
     @nonobjc
     func checkExpectationsImmediately() {
         
-        self.waitForExpectations(timeout: 0, handler: nil)
+        self.waitForExpectations(timeout: 0, handler: { _ in })
     }
     
     @nonobjc
     func waitAndCheckExpectations() {
         
-        self.waitForExpectations(timeout: 10, handler: nil)
+        self.waitForExpectations(timeout: 10, handler: {_ in })
     }
     
     // MARK: XCTestCase

CoreStoreTests/QueryTests.swift

@@ -1170,7 +1170,7 @@ class QueryTests: BaseTestDataTestCase {
             ]
             do {
                 
-                let values: [NSDictionary]? = stack.queryAttributes(
+                let values = stack.queryAttributes(
                     from,
                     Select(
                         "testBoolean",
@@ -1185,7 +1185,7 @@ class QueryTests: BaseTestDataTestCase {
                 )
                 XCTAssertNotNil(values)
                 XCTAssertEqual(
-                    values!,
+                    values as Any as! [NSDictionary],
                     [
                         [
                             "testBoolean": NSNumber(value: false),
@@ -1221,7 +1221,7 @@ class QueryTests: BaseTestDataTestCase {
             let queryClauses: [QueryClause] = []
             do {
                 
-                let values: [NSDictionary]? = stack.queryAttributes(
+                let values = stack.queryAttributes(
                     from,
                     Select(
                         .sum("testBoolean"),
@@ -1234,7 +1234,7 @@ class QueryTests: BaseTestDataTestCase {
                 )
                 XCTAssertNotNil(values)
                 XCTAssertEqual(
-                    values!,
+                    values as Any as! [NSDictionary],
                     [
                         [
                             "sum(testBoolean)": 3,
@@ -1248,7 +1248,7 @@ class QueryTests: BaseTestDataTestCase {
             }
             do {
                 
-                let values: [NSDictionary]? = stack.queryAttributes(
+                let values = stack.queryAttributes(
                     from,
                     Select(
                         .sum("testBoolean", as: "testSum"),
@@ -1261,7 +1261,7 @@ class QueryTests: BaseTestDataTestCase {
                 )
                 XCTAssertNotNil(values)
                 XCTAssertEqual(
-                    values!,
+                    values as Any as! [NSDictionary],
                     [
                         [
                             "testSum": 3,

Sources/CoreStore.swift

@@ -63,7 +63,7 @@ public enum CoreStore {
     
     // MARK: Private
     
-    private static let defaultStackBarrierQueue = DispatchQueue(concurrentWith: "com.coreStore.defaultStackBarrierQueue")
+    private static let defaultStackBarrierQueue = DispatchQueue.concurrent("com.coreStore.defaultStackBarrierQueue")
     
     private static var defaultStackInstance: DataStack?
 }

Sources/Internal/CoreStoreFetchRequest.swift

@@ -45,9 +45,18 @@ internal final class CoreStoreFetchRequest<T: NSFetchRequestResult>: NSFetchRequ
     // MARK: NSFetchRequest
     
     @objc
-    override var affectedStores: [NSPersistentStore]? {
+    dynamic override var affectedStores: [NSPersistentStore]? {
         
-        get { return super.affectedStores }
+        get {
-        set { super.affectedStores = newValue }
+            
+            return super.affectedStores
+//            let affectedStores: NSArray? = super.affectedStores.flatMap({ NSArray(array: $0) } )
+//            return affectedStores as? [NSPersistentStore]
+        }
+        set {
+            
+            super.affectedStores = newValue
+//            super.affectedStores = newValue.flatMap(Array.init)
+        }
     }
 }

Sources/Internal/DispatchQueue+CoreStore.swift

@@ -30,9 +30,10 @@ import Foundation
 
 internal extension DispatchQueue {
     
-    internal convenience init(serialWith label: String, qos: DispatchQoS = .default) {
+    @nonobjc
+    internal static func serial(_ label: String, qos: DispatchQoS = .default) -> DispatchQueue {
         
-        self.init(
+        return DispatchQueue(
             label: label,
             qos: qos,
             attributes: [],
@@ -41,9 +42,10 @@ internal extension DispatchQueue {
         )
     }
     
-    internal convenience init(concurrentWith label: String, qos: DispatchQoS = .default) {
+    @nonobjc
+    internal static func concurrent(_ label: String, qos: DispatchQoS = .default) -> DispatchQueue {
         
-        self.init(
+        return DispatchQueue(
             label: label,
             qos: qos,
             attributes: .concurrent,
@@ -52,6 +54,7 @@ internal extension DispatchQueue {
         )
     }
     
+    @nonobjc
     internal func cs_isCurrentExecutionContext() -> Bool {
         
         let specific = ObjectIdentifier(self)
@@ -60,21 +63,25 @@ internal extension DispatchQueue {
         return DispatchQueue.getSpecific(key: Static.specificKey) == specific
     }
     
+    @nonobjc
     internal func cs_sync<T>(_ closure: () throws -> T) rethrows -> T {
         
         return try self.sync { try autoreleasepool(invoking: closure) }
     }
     
+    @nonobjc
     internal func cs_async(_ closure: @escaping () -> Void) {
         
         self.async { autoreleasepool(invoking: closure) }
     }
     
+    @nonobjc
     internal func cs_barrierSync<T>(_ closure: () throws -> T) rethrows -> T {
         
         return try self.sync(flags: .barrier) { try autoreleasepool(invoking: closure) }
     }
     
+    @nonobjc
     internal func cs_barrierAsync(_ closure: @escaping () -> Void) {
         
         self.async(flags: .barrier) { autoreleasepool(invoking: closure) }

Sources/Internal/FetchedResultsControllerDelegate.swift

@@ -108,7 +108,7 @@ internal final class FetchedResultsControllerDelegate<EntityType: NSManagedObjec
             return
         }
         
-        guard let actualType = NSFetchedResultsChangeType(rawValue: type.rawValue) else {
+        guard var actualType = NSFetchedResultsChangeType(rawValue: type.rawValue) else {
             
             // This fix is for a bug where iOS passes 0 for NSFetchedResultsChangeType, but this is not a valid enum case.
             // Swift will then always execute the first case of the switch causing strange behaviour.
@@ -123,19 +123,12 @@ internal final class FetchedResultsControllerDelegate<EntityType: NSManagedObjec
 
         if #available(iOS 10.0, tvOS 10.0, watchOS 3.0, *) {
          
-            // iOS 10 is better, but still not perfect...
+            // I don't know if iOS 10 even attempted to fix this mess...
             if case .update = actualType,
-                let indexPath = indexPath,
+                indexPath != nil,
-                let newIndexPath = newIndexPath {
+                newIndexPath != nil {
                 
-                self.handler?.controller(
+                actualType = .move
-                    controller,
-                    didChangeObject: anObject,
-                    atIndexPath: indexPath,
-                    forChangeType: .move,
-                    newIndexPath: newIndexPath
-                )
-                return
             }
         }
         

Sources/Internal/NSManagedObjectContext+Transaction.swift

@@ -147,7 +147,7 @@ internal extension NSManagedObjectContext {
     }
     
     @nonobjc
-    internal func saveAsynchronouslyWithCompletion(_ completion: ((_ result: SaveResult) -> Void) = { _ in }) {
+    internal func saveAsynchronouslyWithCompletion(_ completion: @escaping ((_ result: SaveResult) -> Void) = { _ in }) {
         
         self.perform {
             

Sources/Internal/NotificationObserver.swift

@@ -34,7 +34,7 @@ internal final class NotificationObserver {
     
     let observer: NSObjectProtocol
     
-    init(notificationName: Notification.Name, object: AnyObject?, queue: OperationQueue? = nil, closure: @escaping (_ note: Notification) -> Void) {
+    init(notificationName: Notification.Name, object: Any?, queue: OperationQueue? = nil, closure: @escaping (_ note: Notification) -> Void) {
         
         self.observer = NotificationCenter.default.addObserver(
             forName: notificationName,

Sources/Setup/DataStack.swift

@@ -385,18 +385,15 @@ public final class DataStack {
     internal let mainContext: NSManagedObjectContext
     internal let model: NSManagedObjectModel
     internal let migrationChain: MigrationChain
-    internal let childTransactionQueue = DispatchQueue(serialWith: "com.coreStore.dataStack.childTransactionQueue")
+    internal let childTransactionQueue = DispatchQueue.serial("com.coreStore.dataStack.childTransactionQueue")
-    internal let storeMetadataUpdateQueue = DispatchQueue(concurrentWith: "com.coreStore.persistentStoreBarrierQueue")
+    internal let storeMetadataUpdateQueue = DispatchQueue.concurrent("com.coreStore.persistentStoreBarrierQueue")
     internal let migrationQueue: OperationQueue = {
         
         let migrationQueue = OperationQueue()
         migrationQueue.maxConcurrentOperationCount = 1
         migrationQueue.name = "com.coreStore.migrationOperationQueue"
         migrationQueue.qualityOfService = .utility
-        migrationQueue.underlyingQueue = DispatchQueue(
+        migrationQueue.underlyingQueue = DispatchQueue.serial("com.coreStore.migrationQueue", qos: .userInitiated)
-            serialWith: "com.coreStore.migrationQueue",
-            qos: .userInitiated
-        )
         return migrationQueue
     }()
     

Sources/Transactions/BaseDataTransaction.swift

@@ -451,7 +451,7 @@ public /*abstract*/ class BaseDataTransaction {
     
     internal let context: NSManagedObjectContext
     internal let transactionQueue: DispatchQueue
-    internal let childTransactionQueue = DispatchQueue(serialWith: "com.corestore.datastack.childtransactionqueue")
+    internal let childTransactionQueue = DispatchQueue.serial("com.corestore.datastack.childtransactionqueue")
     internal let supportsUndo: Bool
     internal let bypassesQueueing: Bool
     

Sources/Transactions/DataStack+Transaction.swift

@@ -69,10 +69,7 @@ public extension DataStack {
         
         return UnsafeDataTransaction(
             mainContext: self.rootSavingContext,
-            queue: DispatchQueue(
+            queue: DispatchQueue.serial("com.coreStore.dataStack.unsafeTransactionQueue", qos: .userInitiated),
-                serialWith: "com.coreStore.dataStack.unsafeTransactionQueue",
-                qos: .userInitiated
-            ),
             supportsUndo: supportsUndo
         )
     }