NSFetchedResultsController with relationship not updating

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The NSFetchedResultsController is only designed to watch one entity at a time. Your setup, while it makes sense, it a bit beyond what the NSFetchedResultsController is currently capable of watching on its own.

My recommendation would be to set up your own watcher. You can base it off the ZSContextWatcher I have set up on GitHub, or you can make it even more straightforward.

Basically, you want to watch for NSManagedObjectContextDidSaveNotification postings and then reload your table when one fire that contains your department entity.

I would also recommend filing a rdar with Apple and asking for the NSFetchedResultsController to be improved.

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