Question

I would like to build the NSPredicate for a Core Data query which should retrieve all IBEstPeriod managed objects whose 1:n relationship estType.consHistory.consType <> NIL *.

Unfortunately I have not found any clue on how such a NSPredicate should look like. Do you have any idea or suggestion?

Thank you!

Answer 1

Use “ANY” for to-many-relationships in predicates:

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setEntity:[NSEntityDescription entityForName:@"IBEstPeriod" inManagedObjectContext:context]];
[fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"ANY estType.consHistory.consType != nil"]];

 NSArray *fetchResult = [managedObjectContext executeFetchRequest:fetchRequest error:nil];