gistfile1.m

  // Create a new instance of the entity managed by the fetched results controller.
  NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
  NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity];
  Account *account = [NSEntityDescription insertNewObjectForEntityForName:[entity name]
                                                   inManagedObjectContext:context];
  
  [account setValue:[userDict valueForKey:@"username"] forKey:@"username"];
  [account setValue:[userDict valueForKey:@"password"] forKey:@"password"];
  [account getAvatar];