CoreData "in" predicate
CoreData "in" predicate
- Subject: CoreData "in" predicate
- From: Rick Mann <email@hidden>
- Date: Sun, 2 May 2010 05:27:15 -0700
Hi.
I have two entities: Mission and Favorite. Favorite has a single relation to Mission. I need to fetch all Mission objects that exist in Favorite. I'm using an NSFetchResultsController.
I created an array with all the Mission objects found in the Favorite entity. Then I tried to create a predicate like this:
NSPredicate* pred = [NSPredicate predicateWithFormat: @"in %@", favoriteMissions];
and use that on a fetch of Mission objects. But it complains that it can't parse that format string.
Clearly, this approach isn't going to work. I could store the Mission's key in the Favorite table instead, but that's less elegant. Might be the only way to go.
Any suggestions?
tia,
Rick
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