How do I set up an NSPredicate to check a relationship's attribute?

Question

I have an entity called Entry, which has a one-to-many relationship with an entity called Media. The relationship name, from the Media side, is entry. Entry has an attribute named entryID, and I want to create a NSPredicate on media entities which returns all where their entry relationship has a particular entryID. How do I do this?

Answer 1

Assuming the relationship you want to fetch is called entry and entryID is some kind of number type.

NSNumber *desiredID = @(12345);
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"entry.entryID = %@", desiredID];