Core Data, NSPredicate and to-many key

Question

I have a Core Data model in which a Task entity includes an optional to-many relationship excludedOccurrences. One of the properties of excludedOccurrences is start, which i

Answer 1

So, to test for a non-empty relationship, this actually works:

[NSPredicate predicateWithFormat:@"relationship.@count != 0"]

The solution given by Ashley Clark crashes for me giving "to-many key not allowed here"