Core Data, NSPredicate, ANY key.path == nil

Question

I came up with a solution to this using subquery, but I don\'t understand why what I was trying to do first didn\'t work.

Here\'s my data model. I\'m fetching on Adv

Answer 1

I believe you cannot use nil in the query. You should maybe use NULL or the format string construct like "ANY conditions.terrain == %@", nil.

What puzzles me is that your subquery is working...

The above is not correct, as NULLand NILcan be used interchangeably.

Instead, the NSExpression Class Reference gives exactly your pattern (with @count) as the preferred example.

Did you check that the terrain relationship is optional?