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Editorial Team
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Asked: 2026-06-18T03:11:09+00:00

I have a CoreData entity called Item with two values (well, two values relevant

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I have a CoreData entity called Item with two values (well, two values relevant to this question).

Item
---------------
id - NSString
name - NSString

Every item has a unique ID and SHOULD have a unique name.

(BTW, the id is not used for CoreData it is used for communicating with the server).

There are a couple of items which appear to have duplicate names and I’m trying to find a query that returns all items that have an item in the table with a duplicate name.

Is this possible?

If so, can someone provide an NSPredicate (or method) to do this.

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1 Answer

  1. Editorial Team

    I do not think that it is possible to fetch exactly the items with duplicate names with a Core Data fetch request. (I think there was a similar question some time ago here on SO, but I cannot find it right now.)

    You could fetch all items sorted by the name attribute. Then the duplicates can be found with a single loop over the result array.

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