NSFetchedResultsController crashes on objectAtIndexPath?

Question

I\'m getting a crash when trying to access an object in NSFetchedResultsController.

2013-11-10 15:15:06.568 Social[11503:70b] CoreData: error: Serio         


        

Answer 1

In one of my NSManagedObject subclasses I had the follwiing code which was causing the issue. NSSets are automatically initialized on NSManagedObejcts and there is no need to initialize them.

- (void)awakeFromFetch
{
    if (!self.comments)
        self.comments = [NSMutableSet set];

    if (!self.medias)
        self.medias = [NSMutableSet set];
}

Another problem was that during insert indexPath is null, I had to use newIndexPath instead

case NSFetchedResultsChangeInsert:
    [self.tableView insertRowsAtIndexPaths:@[newIndexPath]
                          withRowAnimation:UITableViewRowAnimationAutomatic];
    break;