StackOverflow2013

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copied!<p>Store your parent object somewhere in your child view controller, typically it should be like </p> <p>.h file:</p> <pre><code>@property (nonactomic, strong) ParentObject *parentObject; </code></pre> <p>.m file</p> <pre><code>- (id)initWithObject:(ParentObject *)parent { … _parentObject = parent; … } </code></pre> <p>then fetching: (you should have <code>@property (nonatomic, strong) NSFecthedResultsController *fetchedResultController</code>)</p> <pre><code>- (NSFetchedResultsController*)fetchedResultController { if (_fetchedResultController) { return _fetchedResultController; } NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:NSStringFromClass([ChildObject class])]; [request setEntity:entity]; NSSortDescriptor *sortDescription = [NSSortDescriptor sortDescriptorWithKey:@"sortOrder" ascending:YES]; [request setSortDescriptors:@[sortDescription]]; request.predicate = [NSPredicate predicateWithFormat:@"(parent == %@)", self.parentObject]; NSFetchedResultsController *controller = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:[NSManagedObjectContext mainThreadContext] sectionNameKeyPath:nil cacheName:nil]; controller.delegate = self; _fetchedResultController = controller; return _fetchedResultController; } </code></pre> <p>then implement method</p> <pre><code>- (void)performFetch { NSError *error = nil; [self.fetchedResultController performFetch:&error]; if (![self.fetchedResultController performFetch:&error]) { [self showAlertWithError:error]; } else { [self.tableView reloadData]; } } </code></pre> <p>thats it basically you will receive all child objects you need sorted and filtered by predicate</p>

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