With Xcode 7, two different files are created when you choose to `Create NSManagedObject Subclass`. One file is an extension that adds the properties that are added in the model editor. You aren't supposed to edit this file. Instead you edit the second file, the class file, that's created. This is where you add any custom functionality you want your NSManagedObject subclass to have. The point of this, as far as I can tell, is so that you can add your custom functionality, but when you later change the model, you can regenerate a new extension with the updated attributes/relationships without affecting or overwriting the custom code that you wrote.
But...
Xcode 7 beta 1 isn't doing this. Selecting `Create NSManagedObject Subclass` blows away both files. Is this a bug or am I missing something?
Erik