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Asked: 2026-05-16T04:37:09+00:00

I have entity Unit and Tag , each with to-many relation to other. I

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I have entity Unit and Tag, each with to-many relation to other.

I am using NSFetchedResultsController to manage the data. What I need is to return distinct Unit object into NSFetchedResultsController for condition Tag.show == YES. I’m not sure how to feed all this to NSFetchedResultsController. Set entity to Unit or Tag, how to build predicate for it.

Example:

I have 6 Tag objects tag1...tag6 and 3 Unit object unit1, unit2, unit3.
tag1, tag2 are pointing to unit1, tag3, tag4 to unit2.
tag1…tag4 met show == YES condition.
So I want finally to get uni1 and unit2 into NSFetchedResultsController.

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1 Answer

  1. Editorial Team

    Do a fetch on the Unit entity with a predicate of "ANY Tag.show==YES".

    That will return any Unit instances that has one or more related Tag instances with show==YES. Fetches return distinct objects so you don’t have to do anything else.

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