Open Radar

 
Possible duplicates: rdar://21779132, rdar://15262692, rdar://22684413

Summary:
NSFetchedResultsController crashes on -controllerDidChangeContent: on inserting new record and saving to persistentStore. Reproducable when running iPhone app ins supporting mode on iPad.

Example code fragment given:

- (void)controller:(NSFetchedResultsController *)controller
   didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath
     forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath {
    NSLog(@"== UPDATING indexPath (%@) newIndexPath (%@) type %i", indexPath, newIndexPath, (int)type);
    switch (type) {
        case NSFetchedResultsChangeDelete: {
            [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationTop];
            break;
        }
        case NSFetchedResultsChangeInsert: {
            [self.tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationBottom];
            break;
        }
        case NSFetchedResultsChangeMove: {
            [self.tableView moveRowAtIndexPath:indexPath toIndexPath:newIndexPath];
            break;
        }
        case NSFetchedResultsChangeUpdate: {
            [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationTop];
            break;
        }
        default:
            break;
    }
}

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
    NSLog(@"== BEGIN UPDATING");
    [self.tableView beginUpdates];
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    NSLog(@"== END UPDATING");
    [self.tableView endUpdates];
}

Steps to Reproduce:
1. Create NSFetchedResultsController;
2. Implement NSFetchedResultsController delegate methods (like in description);
3. Implement creation of entity to which instance NSFetchedResultsController was subscribed;
4. Run code on iPad;
5. Perform save to persistant store.

Expected Results:
- (void)controller: didChangeObject: atIndexPath: forChangeType: newIndexPath: is called once and with type 1 (NSFetchedResultsChangeInsert)

Actual Results:
- (void)controller: didChangeObject: atIndexPath: forChangeType: newIndexPath: is called multilpe times with types: 4 and 3 (NSFetchedResultsChangeUpdate, NSFetchedResultsChangeMove respectively) during one "changeContent" session with the same index paths (logs file attached)

Version:
iOS 8.3 (12F69)

Notes:
In target application FetchedResults delegate was implemented in UITableViewController subclass. And FetchedResultsController was working with child managed object context.

Configuration:
iPad mini (ME279TU/A)