gistfile1.m

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer = [AFJSONResponseSerializer serializer];
    manager.requestSerializer = [AFJSONRequestSerializer serializer];
    
    [manager GET:@"http://localhost:3000/api/v1/tracks/1"
        parameters:nil
           success:^(AFHTTPRequestOperation *operation, id responseObject) {
               NSLog(@"JSON: manager %@", responseObject);

               DDLogVerbose(@"Request Successful, responseObject '%@'", responseObject);

               NSDictionary *response = (NSDictionary *)responseObject;

               Track *track = [[Track alloc] init];
               track.id = [responseObject valueForKey:@"id"];
               NSLog(@"track: %@", track);


               Track *trackData = [MTLJSONAdapter modelOfClass:Track.class fromJSONDictionary:response error:nil];
               NSLog(@"track: MTLJSONAdapter %@", trackData);

               
           }
           failure:^(AFHTTPRequestOperation *operation, NSError *error) {
               NSLog(@"Error: manager %@", error);
           }];