Question

I am using an NSFetchedResultsController that uses a predicate to fetch some managed objects. I have always assumed that the NSFetchedResultsController is updated when the objects change, i.e. if I have a predicate "box == 3" and box is changed to 2, it won’t be fetched.

However, even though I changed the objects and saved the managed object context, I can still access the object through my FRC. Even when deleting the cache, this is still possible.

Is this the correct behavior?

Answer 1

After some further testing I think it is save to assume that the FRC is not updated without me doing something. I only call -performFetch: once and I did not implement the delegate. According to the docs the FRC seems to only then register for change notifications:

If you set a delegate for a fetched results controller, the controller
registers to receive change notifications from its managed object
context.