folder structure

Sources/Convenience/NSManagedObject+Convenience.swift

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+//
+//  NSManagedObject+Convenience.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: - NSManagedObject
+
+public extension NSManagedObject {
+    
+    /**
+     Provides a convenience wrapper for accessing `primitiveValueForKey(...)` with proper calls to `willAccessValueForKey(...)` and `didAccessValueForKey(...)`. This is useful when implementing accessor methods for transient attributes.
+     
+     - parameter KVCKey: the KVC key
+     - returns: the primitive value for the KVC key
+     */
+    @nonobjc
+    @warn_unused_result
+    public func accessValueForKVCKey(KVCKey: KeyPath) -> AnyObject? {
+        
+        self.willAccessValueForKey(KVCKey)
+        let primitiveValue: AnyObject? = self.primitiveValueForKey(KVCKey)
+        self.didAccessValueForKey(KVCKey)
+        
+        return primitiveValue
+    }
+    
+    /**
+     Provides a convenience wrapper for setting `setPrimitiveValue(...)` with proper calls to `willChangeValueForKey(...)` and `didChangeValueForKey(...)`. This is useful when implementing mutator methods for transient attributes.
+     
+     - parameter value: the value to set the KVC key with
+     - parameter KVCKey: the KVC key
+     */
+    @nonobjc
+    public func setValue(value: AnyObject?, forKVCKey KVCKey: KeyPath) {
+        
+        self.willChangeValueForKey(KVCKey)
+        self.setPrimitiveValue(value, forKey: KVCKey)
+        self.didChangeValueForKey(KVCKey)
+    }
+    
+    /**
+     Re-faults the object to use the latest values from the persistent store
+     */
+    @nonobjc
+    public func refreshAsFault() {
+        
+        self.managedObjectContext?.refreshObject(self, mergeChanges: false)
+    }
+    
+    /**
+     Re-faults the object to use the latest values from the persistent store and merges previously pending changes back
+     */
+    @nonobjc
+    public func refreshAndMerge() {
+        
+        self.managedObjectContext?.refreshObject(self, mergeChanges: true)
+    }
+}