Core Data: Predicate that Returns Objects of Another Entity?

Firstly, you don't have a reciprocal relationship defined between Details and Lookup but just a one-way Lookup to Details . You need to add a relationship to both the data model entity running from Detail to Lookup and have it set has the recipocal of Lookup. SearchResults and your Detail class needs a property something like.

Hard to answer without some of your sample code or even the actual relationships, but here goes.

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