PlaceController.m

- (NSFetchedResultsController *)fetchedResultsController {
    if (_fetchedResultsController != nil)
    {
        return _fetchedResultsController;
    }
    
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY checkins.place = %@", self.place];
    return [User MR_fetchAllGroupedBy:nil withPredicate:predicate sortedBy:nil ascending:TRUE];
}