This Gist will intertwine RK and MagicalRecord.

RestKitMagicalRecord.h

// Initialize RestKit
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
RKObjectManager *objectManager = [[RKObjectManager alloc] initWithHTTPClient:httpClient];
[AFNetworkActivityIndicatorManager sharedManager].enabled = YES;

// Complete Core Data stack initialization
NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
objectManager.managedObjectStore = managedObjectStore;

// Invoke mappings method
[self setMappings:managedObjectStore objectManager:objectManager];

NSString *databaseName = @"DBName.sqlite";
[managedObjectStore createPersistentStoreCoordinator];
NSString *storePath = [RKApplicationDataDirectory() stringByAppendingPathComponent:databaseName];

NSError *error;

NSPersistentStore *persistentStore;
persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:storePath
                                              fromSeedDatabaseAtPath:nil
                                                   withConfiguration:nil
                                                             options:nil
                                                               error:&error];
[ [NSURLCache sharedURLCache] removeAllCachedResponses];

[managedObjectStore createManagedObjectContexts];
managedObjectStore.managedObjectCache = [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:managedObjectStore.persistentStoreManagedObjectContext];

// Add to magical record
[NSManagedObjectContext MR_initializeDefaultContextWithCoordinator:managedObjectStore.persistentStoreCoordinator];