ios - NSPredicate for a Core Data Search -

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i have 3 nsmanagedobjets; person, stuff, , collection.

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i want use nspredicate list of collections theperson has.

example: scott has objecta , objectb in collection letters , object1 in collection numbers.

i want able fetch request , collection letters , numbers.

i tried:

nspredicate *predicate = [nspredicate predicatewithformat:@"any stuffs.persons == %@", person];

and:

nspredicate *predicate = [nspredicate predicatewithformat:@"subquery(stuffs, $s, $s.persons == %@)", scott];

any suggestions?

your subquery syntax wrong (for full explanation, see this answer or this answer). should like:

subquery(stuffs, $s, $s.persons == %@).@count > 0

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