Why NSFetchedResultsController is not being updated with new data?

Question

My Core Data model has two entities: Author and Book with a To-Many relationship (one author->many books). In the main view I display a list of

Answer 1

Today with Swift everything is easier.

1. You implement NSFetchedResultsControllerDelegate in your controller
2. Set your controller as delegate of your NSFetchedResultsController.
3. Do not use performFetch on your fetchedResultsController, it swallows up the event which normally goes to the delegate.
4. Change a Managed object -> delegate methods should be called.