I use operations in operation queue which update data and send notifications at the end.
My problem is I may process the old data while a new entities are already available and this causes an exception. I could process the old data and then process the new ones but I must to store/copy old data anyways.
How to solve this issue if Core Data doesn't allow to retain/copy its managed objects? I tried MagicalRecord but both it and pure Core Data don't provide the ready necessary solutions.