Do I manually need to save the managedObjectContext for NSFetchedResultsController if I change some attribute?

Question

I'm using an NSFetchedResultsController to populate and manage my tables data source.

When a user picks a certain row, an actionsheet pops up and then lets the user change a value for that row:

NSManagedObject *managedObject = [fetchedResultsController objectAtIndexPath:selectedRowIndexPath];
[managedObject setValue:status forKey:@"status"];

This works really well and I can see the changes immediately in the tableview. This means that the NSFetchedResultsController knows something is changed and therefore reloads that tableviewcell. When I stop and quit my app (completely) then reopen it, the change is not saved.

I would think NSFetchedResultsConroller takes care of saving changes.

Do I need to save manually using the following code after every change?

// Save the context.
NSError *error = nil;
if (![self.managedObjectContext save:&error]) {
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();
}

Or maybe call this code in:

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject 
       atIndexPath:(NSIndexPath *)indexPath 
     forChangeType:(NSFetchedResultsChangeType)type 
      newIndexPath:(NSIndexPath *)newIndexPath

Answer 1

You are correct. You need to manually save the context to the store. NSFetchedResultsController grabs data from the context, but does not save data to the store.