Supporting transformable attributes

Source/Classes/Fetch/SubOperations/RecordToCoreDataOperation.swift

@@ -78,7 +78,20 @@ class RecordToCoreDataOperation: AsynchronousOperation {
 
 			let attribute = CloudKitAttribute(value: recordValue, fieldName: key, entityName: entityName, serviceAttributes: serviceAttributeNames, context: context)
 			let coreDataValue = try attribute.makeCoreDataValue()
-			object.setValue(coreDataValue, forKey: key)
+
+            if let attribute = object.entity.attributesByName[key], attribute.attributeType == .transformableAttributeType,
+                let data = coreDataValue as? Data {
+                if let name = attribute.valueTransformerName, let transformer = ValueTransformer(forName: NSValueTransformerName(rawValue: name)) {
+                    let value = transformer.transformedValue(coreDataValue)
+                    object.setValue(value, forKey: key)
+                } else if let unarchivedObject = NSKeyedUnarchiver.unarchiveObject(with: data) {
+                    object.setValue(unarchivedObject, forKey: key)
+                } else {
+                    object.setValue(coreDataValue, forKey: key)
+                }
+            } else {
+                object.setValue(coreDataValue, forKey: key)
+            }
 		}
 
 		// Set system headers

Source/Classes/Save/ObjectToRecord/CoreDataAttribute.swift

@@ -23,14 +23,22 @@ class CoreDataAttribute {
 			// it is not an attribute
 			return nil
 		}
-		
-		self.description = description
+        
+        self.description = description
 
 		if value is NSNull {
 			self.value = nil
-		} else {
-			self.value = value
-		}
+        } else if let attribute = entity.attributesByName[attributeName],
+            attribute.attributeType == .transformableAttributeType {
+            if let transformerName = attribute.valueTransformerName,
+                let transformer = ValueTransformer(forName: NSValueTransformerName(rawValue: transformerName)) {
+                self.value = transformer.reverseTransformedValue(value)
+            } else {
+                self.value = NSKeyedArchiver.archivedData(withRootObject: value)
+            }
+        } else {
+            self.value = value
+        }
 
 		self.name = attributeName
 	}