Support NSFetchedPropertyDescription

MTLManagedObjectAdapter/MTLManagedObjectAdapter.h

@@ -107,6 +107,9 @@ FOUNDATION_EXPORT const unsigned char MTLManagedObjectAdapterVersionString[];
 // be used.
 + (NSDictionary *)relationshipModelClassesByPropertyKey;
 
+// similar with relationshipModelClassesByPropertyKey
++ (NSDictionary *)fetchedPropertyModelClassesByPropertyKey;
+
 // Overridden to deserialize a different class instead of the receiver, based on
 // information in the provided object.
 //

MTLManagedObjectAdapter/MTLManagedObjectAdapter.m

@@ -10,8 +10,8 @@
 
 #import <Mantle/Mantle.h>
 
-#import "EXTScope.h"
-#import "EXTRuntimeExtensions.h"
+#import "mtl_moa_EXTScope.h"
+#import "mtl_moa_EXTRuntimeExtensions.h"
 
 #import "MTLManagedObjectAdapter.h"
 
@@ -64,6 +64,9 @@ @interface MTLManagedObjectAdapter ()
 // A cached copy of the return value of +relationshipModelClassesByPropertyKey.
 @property (nonatomic, copy, readonly) NSDictionary *relationshipModelClassesByPropertyKey;
 
+// A cached copy of the return value of +fetchedPropertyModelClassesByPropertyKey.
+@property (nonatomic, copy, readonly) NSDictionary *fetchedPropertyModelClassesByPropertyKey;
+
 // A cache of the return value of -valueTransformersForModelClass:
 @property (nonatomic, copy, readonly) NSDictionary *valueTransformersByPropertyKey;
 
@@ -144,6 +147,10 @@ - (id)initWithModelClass:(Class)modelClass {
 	if ([modelClass respondsToSelector:@selector(relationshipModelClassesByPropertyKey)]) {
 		_relationshipModelClassesByPropertyKey = [[modelClass relationshipModelClassesByPropertyKey] copy];
 	}
+
+    if ([modelClass respondsToSelector:@selector(fetchedPropertyModelClassesByPropertyKey)]) {
+        _fetchedPropertyModelClassesByPropertyKey = [[modelClass fetchedPropertyModelClassesByPropertyKey] copy];
+    }
 
 	return self;
 }
@@ -200,6 +207,25 @@ - (id)modelFromManagedObject:(NSManagedObject *)managedObject processedObjects:(
 
 			return setValueForKey(propertyKey, value);
 		};
+
+        BOOL (^deserializeFetchedProperty)(NSFetchedPropertyDescription *) = ^(NSFetchedPropertyDescription *fetchedPropertyDescription) {
+            Class nestedClass = self.fetchedPropertyModelClassesByPropertyKey[propertyKey];
+            if (nestedClass == nil) {
+                [NSException raise:NSInvalidArgumentException format:@"No class specified for decoding relationship at key \"%@\" in managed object %@", managedObjectKey, managedObject];
+            }
+            id models = performInContext(context, ^id{
+                NSArray *fetchedArray = [managedObject valueForKey:managedObjectKey];
+                NSMutableArray *models = [NSMutableArray arrayWithCapacity:[fetchedArray count]];
+                for (NSManagedObject *nestedObject in fetchedArray) {
+                    id<MTLManagedObjectSerializing> model = [self.class modelOfClass:nestedClass fromManagedObject:nestedObject error:error];
+                    [models addObject:model];
+                }
+
+                return models;
+            });
+
+            return setValueForKey(propertyKey, models);
+        };
 
 		BOOL (^deserializeRelationship)(NSRelationshipDescription *) = ^(NSRelationshipDescription *relationshipDescription) {
 			Class nestedClass = self.relationshipModelClassesByPropertyKey[propertyKey];
@@ -262,7 +288,9 @@ - (id)modelFromManagedObject:(NSManagedObject *)managedObject processedObjects:(
 				return deserializeAttribute((id)propertyDescription);
 			} else if ([propertyClassName isEqual:@"NSRelationshipDescription"]) {
 				return deserializeRelationship((id)propertyDescription);
-			} else {
+            } else if ([propertyClassName isEqualToString:@"NSFetchedPropertyDescription"]) {
+                return deserializeFetchedProperty((id)propertyDescription);
+            } else {
 				if (error != NULL) {
 					NSString *failureReason = [NSString stringWithFormat:NSLocalizedString(@"Property descriptions of class %@ are unsupported.", @""), propertyClassName];