Persistant Store and App Update Question

Question

Hey gang. I have an iphone app up on the store which uses core data. Now, every time I change something in my code with relation to core data, namely my managedobjectmodel or my model classes, I have to wipe all my data since I get a persistent store error.

Now I'm finding i need to make changes to my app and I don't want my users to lose all their data. What do I do? This is my frist foray into Core Data so any help is appreciated. Thanks.

Answer 1

You need to version your data model. Check out Xcode > Design > Data Model. Then you need to migrate the data to the new model. This can get complicated depending on the changes.

Try this documentation.

Answer 2

Never mind. It's versioning and migration that I need to look into, no bother.