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count of a to-many relationship in an NSPredicate

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count of a to-many relationship in an NSPredicate

Subject: count of a to-many relationship in an NSPredicate
From: Gonzalo Castro <email@hidden>
Date: Sat, 8 Sep 2007 23:47:28 -0400

Hello,

How can I use the count of a to-many relationship in an NSPredicate? Eg, in a Department <--:>> Employee inverse relationship I'd like to fetch all departments that have no employees. Is the count of to-many relationships something that cannot be fetched? Searching the archives, I've seen this question asked here before but with no followups.

I can find a reference to a 'count' function in the Predicate Programming Guide but no example on how to use functions in an NSPredicate. I also see a array[SIZE] in the Aggregate Operations section but, again, no example of syntax or context.

Thanks,
Gonzalo

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