What do I have to do to get Core Data to automatically migrate models?

Question

I have read the documentation about automatic /lightweight migration for Core Data models - but I am having problems implementing it.

As I understand it the applicat

Answer 1

the menu in Xcode 4 changed a bit. here´s a description how to do it in Xcode 4:

Xcode 4: Setting a Managed Object Model’s Current Version