core data, NSManagedObject changed between app versions

Question

I have an app at the App-Store right now that uses Core-Data with persistent store to save the data as SQL-Lite-store-type, locally on the device.

Actually the Model is very simple, I have only one NSManagedObject in it, called "Product".

In the next version I want to edit "Product" properties in the following way: add a new property and remove 5 properties. (Without the app crashing because of the inconsistency...)

Plus, on the first launch of the application after the user upgrade I want to delete the old stored-DB , because it won't be relevant to the application any more.

I read "Core Data Model Versioning and Data Migration Programming Guide", but still not sure what is the best practice in this case. (Should I use "Lightweight Migration"?)

Please help me...

Answer 1

Using the Lightweight Migration is the simplest choice here. If all you are doing is adding properties, lightweight migration lets you avoid dealing with the inconsistency errors.