iOS Core Data binary operation in predicate expression

Question

This seems to be the same as How to use binary flags in Core Data? but I am getting an "Unsupported function expression" when trying.

I want to create a predicate that can find entities in my Core Data object store which have a certain ID and for which certain binary flags are not set. This is my code snippet:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ownerID = %@ AND ((banned & 8) == 0)", THEUSERUSERID];
NSFetchRequest *fetchRequest = [PCDUser MR_requestAllWithPredicate:predicate];

_frController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:[[COMMDBMANAGER magicalRecordStack] context] sectionNameKeyPath:sectionKeyPath cacheName:nil];

[_frController setDelegate:self];
[_frController performFetch:&error];

Looking at the previous issue in the link above, it appears this should work. However, I get a

'NSInvalidArgumentException', reason: 'Unsupported function expression banned & 8'

Because I need the NSFetchedResultsController results set (and indexPaths etc) to include the filtered results, I have not been able to find a way to filter them after the fact and have the results set include that filtering.

How does one use binary flags in Core Data?

Answer 1

I had a similar predicate in NSFetchRequest and it worked. Check that property banned exists in your model and has a type that supports bitwise operations (for example, Integer32).