NSManagedObjectID into NSData

Question

I found this wonderful NSManagedObjectID. This would be very good for referencing an Entity/NSManagedObject/NSEntityDescription, right?
Let\'s get an ID from an entity:<

Answer 1

As @preston said, don't save an objectID to disk, instead:

1. Make a new attribute on your entity called "id"
2. Make a new attribute on your entitys parent entity called "myEntitysMaxId"
3. Override your entitys parent implementation "addNewMyEntityObject:"
4. There, increase "myEntitysMaxId" and set that value as the new entitys "id"
5. Do as you normally do when you fetch an entity based on its attributes!

Much cleaner and better!