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Editorial Team
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Asked: 2026-06-14T13:55:25+00:00

I am trying to understand Core Data and it is slow progress but I

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I am trying to understand Core Data and it is slow progress but I am slowly getting there. One thing that is puzzling me is how to create a Fetched Request in the data model editor that pulls records with the criteria from across a relationship.

e.g. I have two entities “Main Category” and “Sub Category” which has a one to many relationship.

I can’t see how I can create a Fetched Request in the editor to select Sub Categories that match “SOME_SUB” whos main category is “SOME_MAIN”. in SQL this is trivial but I am banging my head here.

I can see the apple documentation that shows how to create a Fetched Request via code here https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreData/Articles/cdFetching.html but I want to keep the Fetched Requests in the data model view instead.

Any hints?

Thanks

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1 Answer

  1. Editorial Team

    When viewing your data model, select the entity you want to create the fetch request for. Select the “Editor” menu item from the menu bar -> Add Fetch Request.

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