Added alternative way to set keyPathsForValuesAffectingValue(forKey:) for CoreStoreObjects

Sources/CoreStoreManagedObject.swift

@@ -0,0 +1,48 @@
+//
+//  CoreStoreManagedObject.swift
+//  CoreStore
+//
+//  Created by John Rommel Estropia on 2017/06/04.
+//  Copyright © 2017 John Rommel Estropia. All rights reserved.
+//
+
+import CoreData
+
+
+// MARK: - CoreStoreManagedObject
+
+@objc internal class CoreStoreManagedObject: NSManagedObject {
+    
+    @nonobjc
+    internal class func cs_setKeyPathsForValuesAffectingKeys(_ keyPathsForValuesAffectingKeys: [KeyPath: Set<KeyPath>], for managedObjectClass: CoreStoreManagedObject.Type) {
+        
+        Static.queue.sync(flags: .barrier) {
+            
+            Static.cache[ObjectIdentifier(managedObjectClass)] = keyPathsForValuesAffectingKeys
+        }
+    }
+    
+    // MARK: NSManagedObject
+    
+    override class func keyPathsForValuesAffectingValue(forKey key: String) -> Set<String> {
+        
+        return Static.queue.sync(flags: .barrier) {
+            
+            let cacheKey = ObjectIdentifier(self)
+            if let keyPathsForValuesAffectingKeys = Static.cache[cacheKey] {
+                
+                return keyPathsForValuesAffectingKeys[key] ?? []
+            }
+            return super.keyPathsForValuesAffectingValue(forKey: key)
+        }
+    }
+}
+
+
+// MARK: - Private
+
+private enum Static {
+    
+    static let queue = DispatchQueue.concurrent("com.coreStore.coreStoreManagerObjectBarrierQueue")
+    static var cache: [ObjectIdentifier: [KeyPath: Set<KeyPath>]] = [:]
+}