Question

I have the following code set up on a second tab of a tabbarcontroller. The first time I come into the tab, my data is fetched properly, as expected. However, if I leave the tab, and come back, the array returned by the fetch request contains double the entries. Each object it returns is duplicated. If I leave the tab and come back again, then the entries get duplicated again, giving me 3 of each. What am I doing wrong with my request that would make this happen?

- (void)viewWillAppear:(BOOL)animated {
    AppDelegate *delegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"EntityName" inManagedObjectContext:delegate.managedObjectContext];
    [fetchRequest setEntity:entity];

    // sort the results, since we want the most recent entry first
    NSSortDescriptor *dateSort = [[NSSortDescriptor alloc] initWithKey:@"key" ascending:NO];
    NSArray *sortDescriptors = [NSArray arrayWithObject:dateSort];
    [fetchRequest setSortDescriptors:sortDescriptors];

    NSError *error;
    NSMutableArray *array = [[delegate.managedObjectContext executeFetchRequest:fetchRequest error:&error] mutableCopy];
    NSLog(@"error %@",[error localizedDescription]);
    self.fetchedObjects = [array copy];
    [array removeAllObjects];

    [self.tableView reloadData];
}

Update: I switched to NSFetchedResultsController and this fixed my issue.

Answer 1

Switched to NSFetchedResultsController and it solved the problem.