Core Data uses a mapping model

Core Data uses a mapping model

If the new version of the model has more complex changes, you can create a mapping model that specifies how the source model is mapped to the target model.
Create a mapping model, new file, Core Data Select the mapping Model template, and then click the Next button.

In the New dialog box, select the source model, then click the Next button to select the target model,

Finally, in the Save As dialog box, name the mapping model Mymappingmodel, and then save it in your project file.

You can map entities, attributes, and relationships in the source model to the target model.

Core Data uses a mapping model