Question

I have a a one-to-many relationship as an NSOrderedSet on an NSManagedObject.

When the addObject: method is called on the ordered set (which I’m calling from a property on an NSManagedObjectModel subclass object), however, the inverse relationship is not being set automatically. What can cause this?

As a related note, I am using Magical Record to make it easier to map data to the NSManagedObject objects.

Further, I’ve also referred to this post, but I’m not overriding these methods on my subclass:

Core Data Inverse Relationship Not Being Set

Answer 1

NSOrderedSet has serious bugs in Core Data. See this post on ways to get around them for the time being:

Exception thrown in NSOrderedSet generated accessors