Core Data lightweight migration renamed property keep renaming id all the time?

Question

I'm using xcode 5 to develop an app for iPhone, I use lightweight migration to update the Core Data schema.

I create a User entity in model version 1, User has a property called nameA.

In model version 2, I rename User's nameA to nameB, I set nameB's renaming id to nameA. This step is successful, previous value of nameA can be found in nameB.

Then I create model version 3 to add another entity called House, and I found in version 3, User's nameB still has its renaming id set to nameA

I think in model version 3, User's nameB should not has a renaming id, because model version 3 is based on version 2, and in version 3 I did not change anything of User entity

So should I delete the renaming id of User's nameB? or just leave it there?

Anyone know how?

Answer 1

You should leave it there. Your users may not have upgraded to version 2 of your core data schema. When those users upgrade from v1 to v3 they will need to know how to migrate from nameA to nameB