Search Core Data for all objects with an empty "to-many" relationship

iphone ios core-data many-to-many nsfetchedresultscontroller

Here's what you should do:

NSPredicate *predicate = [NSPredicate                          predicateWithFormat:@"lists.@count == 0"];[fetchRequest setPredicate:predicate];

;) wonder where I came up with that solution...

iphone ios core-data many-to-many nsfetchedresultscontroller

Figured it out. Here's what I did:

NSPredicate *predicate = [NSPredicate                          predicateWithFormat:@"lists.@count == 0"];[fetchRequest setPredicate:predicate];

Then when I ran the fetch request, it only brought up the patients with no list attached.

CodeHunter