Core data, managed objects and multiple table view controllers

Question

I have a UITabBarController with two tabs.  Each tab has a UINavigationController and each nav controller has a table view.  The first tab lets you see and edit a list of all employees.  The second tab lets you see a subset of the employees.   My problem is that in the first tab you can delete an employee from core data.  However, when you go back to the second tab it crashes because it still has a pointer to the deleted employee.   Is there an easy way to check if an nsmanaged object has been deleted, or is there a way to notify or listen for deletions?   Thanks

Answer 1

Register for NSManagedObjectContext NSManagedObjectContextDidSaveNotification Call NSFetchedResultsController mergeChangesFromContextDidSaveNotification:

Take a look at the Core Data Books sample code.

Answer 2

If you are using NSFetchedResultsController instances on each table view then you just need to perform a save in the first tab and respond to the delegate methods on the second.

If you are not using a NSFetchedResultsController you should be if you are display a table of data.