How to migrate new data model in a CoreData project ?

Question

Hi

I have a simple problem, I have an app based on CoreData and I need to change the structure a little. How can I migrate the old structure into the new one. Just adding one attribute will chrash the whole app.

Thanks

Answer 1

Have a look at the Apple Docs

http://developer.apple.com/iPhone/library/documentation/Cocoa/Conceptual/CoreDataVersioning/Introduction/Introduction.html

Answer 2

Once you have the basics of Core Data down, you can implement versioning. Until then, if you're just testing things out, you can always delete the app from the Simulator or device. Reinstalling the app will create a fresh data store (usually).