NSBatchUpdateRequest doesn't support updating relationship in Core Data

NSBatchUpdateRequest allows that you can directly store and modify your records rather than with an object graph.

By the way it seems that it doesn’t support updating or modifying a relationship in a core data.

If you want to learn how to use NSBatchUpdateRequest, here is a great and recent tutorial that I found.

So NSBatchUpdateRequest is essential that you handle with lots of data by using Core Data.