- (void)requestDidFinishLoad:(TTURLRequest*)request {
   ...
   ... //read your JSON into a NSDictionary

   NSManagedObjectContent* context = appDelegate.managedObjectContext;
   NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
   for (NSDictionary* itemInfo in jsonItems) {
      DBResource *resource = (DBResource*)[NSEntityDescription insertNewObjectForEntityForName:@"MyEntity" inManagedObjectContext:context];
      resource.id = [itemInfo valueForKey:@"id"];
      resource.name = [itemInfo valueForKey:@"name"];
   }
   NSError *error;
   if( ![context save:&error] ) {
      // handle error
   }

   [context reset];
   [pool drain];
   ... // other cleanup
}