Expose access to the RKMapperOperationDelegate to RKObjectRequestOperation subclasses. closes #1009

Code/Network/RKManagedObjectRequestOperation.m

@@ -84,11 +84,10 @@ static NSURL *RKRelativeURLFromURLAndResponseDescriptors(NSURL *URL, NSArray *re
     return URL;
 }
 
-@interface RKManagedObjectRequestOperation () <RKMapperOperationDelegate>
+@interface RKManagedObjectRequestOperation ()
 // Core Data specific
 @property (nonatomic, strong) NSManagedObjectContext *privateContext;
 @property (nonatomic, copy) NSManagedObjectID *targetObjectID;
-@property (nonatomic, strong) NSMutableDictionary *managedObjectsByKeyPath;
 @property (nonatomic, strong) RKManagedObjectResponseMapperOperation *responseMapperOperation;
 @property (nonatomic, strong, readwrite) NSError *error;
 @property (nonatomic, strong, readwrite) RKMappingResult *mappingResult;
@@ -136,15 +135,6 @@ static NSURL *RKRelativeURLFromURLAndResponseDescriptors(NSURL *URL, NSArray *re
     }
 }
 
-#pragma mark - RKMapperOperationDelegate methods
-
-- (void)mapper:(RKMapperOperation *)mapper didFinishMappingOperation:(RKMappingOperation *)mappingOperation forKeyPath:(NSString *)keyPath
-{
-    if ([mappingOperation.destinationObject isKindOfClass:[NSManagedObject class]]) {
-        [self.managedObjectsByKeyPath setObject:mappingOperation.destinationObject forKey:keyPath];
-    }
-}
-
 #pragma mark - RKObjectRequestOperation Overrides
 
 - (void)cancel
@@ -177,6 +167,7 @@ static NSURL *RKRelativeURLFromURLAndResponseDescriptors(NSURL *URL, NSArray *re
     self.responseMapperOperation = [[RKManagedObjectResponseMapperOperation alloc] initWithResponse:self.HTTPRequestOperation.response
                                                                                                data:self.HTTPRequestOperation.responseData
                                                                                 responseDescriptors:self.responseDescriptors];
+    self.responseMapperOperation.mapperDelegate = self;
     self.responseMapperOperation.targetObjectID = self.targetObjectID;
     self.responseMapperOperation.managedObjectContext = self.privateContext;
     self.responseMapperOperation.managedObjectCache = self.managedObjectCache;

Code/Network/RKObjectRequestOperation.h

@@ -20,6 +20,7 @@
 
 #import "RKHTTPRequestOperation.h"
 #import "RKMappingResult.h"
+#import "RKMapperOperation.h"
 
 /**
  `RKObjectRequestOperation` is an `NSOperation` subclass that implements object mapping on the response body of an `NSHTTPResponse` loaded via an `RKHTTPRequestOperation`.
@@ -48,12 +49,16 @@
  
  `RKObjectRequestOperation` is not able to perform object mapping that targets Core Data destination entities. Please refer to the `RKManagedObjectRequestOperation` subclass for details regarding performing a Core Data object request operation.
  
+ ## Subclassing Notes
+ 
+ The `RKObjectRequestOperation` is a non-current `NSOperation` subclass and can be extended by subclassing and providing an implementation of the `main` method. It conforms to the `RKMapperOperationDelegate` protocol, providing access to the lifecycle of the mapping process to subclasses.
+ 
  @see `RKResponseDescriptor`
  @see `RKHTTPRequestOperation`
  @see `RKMIMETypeSerialization`
  @see `RKManagedObjectRequestOperation`
  */
-@interface RKObjectRequestOperation : NSOperation
+@interface RKObjectRequestOperation : NSOperation <RKMapperOperationDelegate>
 
 ///-----------------------------------------------
 /// @name Initializing an Object Request Operation

Code/Network/RKObjectRequestOperation.m

@@ -235,6 +235,7 @@ static NSString *RKStringDescribingURLResponseWithData(NSURLResponse *response,
                                                                                         data:self.HTTPRequestOperation.responseData
                                                                          responseDescriptors:self.responseDescriptors];
     self.responseMapperOperation.targetObject = self.targetObject;
+    self.responseMapperOperation.mapperDelegate = self;
     [self.responseMapperOperation setQueuePriority:[self queuePriority]];
     [self.responseMapperOperation setWillMapDeserializedResponseBlock:self.willMapDeserializedResponseBlock];
     [[RKObjectRequestOperation responseMappingQueue] addOperation:self.responseMapperOperation];