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Editorial Team
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Asked: 2026-05-14T06:59:41+00:00

In my Core Data model I have two entities: List and Patient. List has

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In my Core Data model I have two entities: List and Patient. List has an attribute called ‘name’.

A List can have any number of Patients and each Patient can belong to any number of different lists. I have therefore set a relationship on List called ‘patients’ that has an inverse to-many relationship to Patient AND a relationship on Patient called ‘lists’ that has a to-many relationship to List.

What I’m struggling to figure out is how to create a Predicate that will select all Patients that belong to a particular List name.

How would I go about this? I have never used relationships before in Core Data.

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1 Answer

  1. Editorial Team

    This seems to work OK:

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(ANY lists == %@)", myList];

    Where myList is an actual List entity.

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