core data, NSManagedObject changed between app versions

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 la开发者_高级运维unch 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...

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.