Core Data migration of attribute from String to Integer 16

Question

I\'m having trouble migrating a store entity attribute from String to Integer 16. Here are the steps I take:

1. Add Model Version...
2. In the new model, ch

Answer 1

For those, who broked thousands of spears on "Can't find mapping model for migration" error, this might help:

1. Make sure, you created mapping file in proper folder/group (before pressing Cmd+N - select .xcdatamodeld file in project navigator).
2. Clean the project.
3. Rebuild the project and run.

In my case, app automagically found the mapping model after clean/rebuild =\