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Relationships not Connected with Core Data and RestKit
{
  "artist" : {
    "artistId" : 123,
    "artistName" : "The Artist",
    "albums" : [
      {
        "albumPrice" : 12.99,
        "albumId" : 456,
        "trackCount" : 12,
        "albumName" : "Album Title",
      },
      {
        "albumPrice" : 10.99,
        "albumId" : 789,
        "trackCount" : 10,
        "albumName" : "Another Album Title",
      }
    ]
  }
}

@interface Artist : NSManagedObject
@property (nonatomic, retain) NSNumber * artistId;
@property (nonatomic, retain) NSString * artistName;
@property (nonatomic, retain) NSSet *albums;
@end
@interface Artist (CoreDataGeneratedAccessors)
- (void)addAlbumsObject:(Album *)value;
- (void)removeAlbumsObject:(Album *)value;
- (void)addAlbums:(NSSet *)values;
- (void)removeAlbums:(NSSet *)values;
@end

@interface Album : NSManagedObject
@property (nonatomic, retain) NSNumber * albumId;
@property (nonatomic, retain) NSString * albumName;
@property (nonatomic, retain) NSNumber * albumPrice;
@property (nonatomic, retain) NSNumber * trackCount;
@property (nonatomic, retain) NSManagedObject *artist;
@end

// Initialize our RestKit singleton
RKClient *client = [RKClient clientWithBaseURL:API_URL];

// Initialize for Object mapping
RKObjectManager* objectManager = [RKObjectManager objectManagerWithBaseURL:API_URL];
objectManager.objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"AppName.sqlite"];

// Configure ALBUM mapping
RKManagedObjectMapping* albumMapping = [RKManagedObjectMapping mappingForClass:[Album class]];
albumMapping.primaryKeyAttribute = @"albumId";
[albumMapping mapKeyPath:@"albumId" toAttribute:@"albumId"];
[albumMapping mapKeyPath:@"albumName" toAttribute:@"albumName"];
[albumMapping mapKeyPath:@"albumPrice" toAttribute:@"albumPrice"];
[albumMapping mapKeyPath:@"trackCount" toAttribute:@"trackCount"];

// Configure ARTIST mapping
RKManagedObjectMapping* artistMapping = [RKManagedObjectMapping mappingForClass:[Artist class]];
artistMapping.primaryKeyAttribute = @"artistId";
[artistMapping mapKeyPath:@"artistId" toAttribute:@"artistId"];
[artistMapping mapKeyPath:@"artistName" toAttribute:@"artistName"];
[artistMapping mapKeyPath:@"albums" toRelationship:@"albums" withMapping:albumMapping];

// Register mappings with the provider
[[RKObjectManager sharedManager].mappingProvider setMapping:albumMapping forKeyPath:@"albums"];
[[RKObjectManager sharedManager].mappingProvider setMapping:artistMapping forKeyPath:@"artist"];

RKObjectManager *objectManager = [RKObjectManager sharedManager];
[objectManager loadObjectsAtResourcePath:@"/artist/123/albums" delegate:self];