Merge branch 'develop' into corestore4_develop

# Conflicts:
#	CoreStore.podspec
#	Sources/CoreStoreImportableAttributeType.swift
#	Sources/CoreStoreQueryableAttributeType.swift
#	Sources/Info.plist
#	Sources/NSManagedObjectModel+Setup.swift

Sources/NSManagedObjectContext+Setup.swift

@@ -0,0 +1,189 @@
+//
+//  NSManagedObjectContext+Setup.swift
+//  CoreStore
+//
+//  Copyright © 2015 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import Foundation
+import CoreData
+
+
+// MARK: - NSManagedObjectContext
+
+internal extension NSManagedObjectContext {
+    
+    // MARK: Internal
+    
+    @nonobjc
+    internal weak var parentStack: DataStack? {
+        
+        get {
+            
+            if let parentContext = self.parent {
+                
+                return parentContext.parentStack
+            }
+            
+            return cs_getAssociatedObjectForKey(&PropertyKeys.parentStack, inObject: self)
+        }
+        set {
+            
+            guard self.parent == nil else {
+                
+                return
+            }
+            
+            cs_setAssociatedWeakObject(
+                newValue,
+                forKey: &PropertyKeys.parentStack,
+                inObject: self
+            )
+        }
+    }
+    
+    @nonobjc
+    internal static func rootSavingContextForCoordinator(_ coordinator: NSPersistentStoreCoordinator) -> NSManagedObjectContext {
+        
+        let context = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
+        context.persistentStoreCoordinator = coordinator
+        context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
+        context.undoManager = nil
+        context.setupForCoreStoreWithContextName("com.corestore.rootcontext")
+        
+        #if os(iOS) || os(OSX)
+            
+        context.observerForDidImportUbiquitousContentChangesNotification = NotificationObserver(
+            notificationName: NSNotification.Name.NSPersistentStoreDidImportUbiquitousContentChanges,
+            object: coordinator,
+            closure: { [weak context] (note) -> Void in
+                
+                context?.perform { () -> Void in
+                    
+                    if let updatedObjectIDs = (note.userInfo?[NSUpdatedObjectsKey] as? Set<NSManagedObjectID>) {
+                        
+                        for objectID in updatedObjectIDs {
+                            
+                            context?.registeredObject(for: objectID)?.willAccessValue(forKey: nil)
+                        }
+                    }
+                    context?.mergeChanges(fromContextDidSave: note)
+                }
+            }
+        )
+            
+        #endif
+        
+        return context
+    }
+    
+    @nonobjc
+    internal static func mainContextForRootContext(_ rootContext: NSManagedObjectContext) -> NSManagedObjectContext {
+        
+        let context = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
+        context.parent = rootContext
+        context.mergePolicy = NSRollbackMergePolicy
+        context.undoManager = nil
+        context.setupForCoreStoreWithContextName("com.corestore.maincontext")
+        context.observerForDidSaveNotification = NotificationObserver(
+            notificationName: NSNotification.Name.NSManagedObjectContextDidSave,
+            object: rootContext,
+            closure: { [weak context] (note) -> Void in
+                
+                guard let rootContext = note.object as? NSManagedObjectContext,
+                    let context = context else {
+                        
+                        return
+                }
+                let mergeChanges = { () -> Void in
+                    
+                    if let updatedObjects = (note.userInfo?[NSUpdatedObjectsKey] as? Set<NSManagedObject>) {
+                        
+                        for object in updatedObjects {
+                            
+                            context.object(with: object.objectID).willAccessValue(forKey: nil)
+                        }
+                    }
+                    context.mergeChanges(fromContextDidSave: note)
+                }
+                if rootContext.isSavingSynchronously == true {
+                    
+                    context.performAndWait(mergeChanges)
+                }
+                else {
+                    
+                    context.perform(mergeChanges)
+                }
+            }
+        )
+        return context
+    }
+    
+    
+    // MARK: Private
+    
+    private struct PropertyKeys {
+        
+        static var parentStack: Void?
+        static var observerForDidSaveNotification: Void?
+        static var observerForDidImportUbiquitousContentChangesNotification: Void?
+    }
+    
+    @nonobjc
+    private var observerForDidSaveNotification: NotificationObserver? {
+        
+        get {
+            
+            return cs_getAssociatedObjectForKey(
+                &PropertyKeys.observerForDidSaveNotification,
+                inObject: self
+            )
+        }
+        set {
+            
+            cs_setAssociatedRetainedObject(
+                newValue,
+                forKey: &PropertyKeys.observerForDidSaveNotification,
+                inObject: self
+            )
+        }
+    }
+    
+    @nonobjc
+    private var observerForDidImportUbiquitousContentChangesNotification: NotificationObserver? {
+        
+        get {
+            
+            return cs_getAssociatedObjectForKey(
+                &PropertyKeys.observerForDidImportUbiquitousContentChangesNotification,
+                inObject: self
+            )
+        }
+        set {
+            
+            cs_setAssociatedRetainedObject(
+                newValue,
+                forKey: &PropertyKeys.observerForDidImportUbiquitousContentChangesNotification,
+                inObject: self
+            )
+        }
+    }
+}