Software⏱️ 2 min read📅 2026-05-31

How to Fix: Exception thrown in NSOrderedSet generated accessors

Learn how to fix: Exception thrown in NSOrderedSet generated accessors.

Quick Answer: Try checking your system settings or restarting.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

The Exception thrown in NSOrderedSet generated accessors is typically caused by a conflict between the ordered relationship and the default behavior of NSManagedObject.

🛑 Root Causes of the Error

  • In a Core Data model, an ordered relationship is created using the `orderedBy` attribute in the entity's attributes inspector.

✅ Best Solutions to Fix It

Method 1: Disable Ordered Relationship

  1. Step 1: Open the entity's attributes inspector and uncheck the "Ordered" checkbox.

Method 2: Update Generated Accessors

  1. Step 1: Open the Item.xcdatamodeld file and select the "subitems" attribute.

🎯 Final Words

By disabling the ordered relationship or updating the generated accessors, you should be able to resolve the Exception thrown in NSOrderedSet generated accessors.

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