Load a previous model version

Question

I am loading a NSManagedObjectModel model with the initWithContentsOfURL: constructor like this:

NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@\"MyDoc         


        

Answer 1

No, it is not foreseen that this is possible. I deduce that from the NSManagedObjectModel documentation, where it says discussing the property versionIdentifiers:

This value is meant to be used as a debugging hint to help you determine the models that were combined to create a merged model.

So it does not seem you are supposed to use previous model versions for your program logic.