Preserving data while expanding/merging Core Data models

Question

Two separate but related questions regarding the use of Core Data:

1) I add an entity/attribute/relationship to my Core Data model in Xcode. Is there a way to have it recognize the information in the existing storedata file and augment it, instead of simply saying that it is incompatible with the existing model?

For example, if I have a cars entity and I decide to add a manufacturers entity with 1:many a relationship between the two, how can I import the existing cars entries?

2) Modifying the example in #1: If I have two existing Core Data models, one with cars and one with manufacturers, is there a way to create a new data model that has both entities, and can import as appropriate from the existing storedata files for each?

Answer 1

Yes, Core Data has versioning and migration capabilities you can use to move a data model forward when changes are made. You can read the docs for this at this link: Introduction to Core Data Model Versioning and Data Migration Programming Guide