Core Data in Xcode 11- Changes to data model

HI, I started an app with core data selected. I created an entity and can save and retrieve data no problem. I now want to add an additional entity with relationship to the first. The model editor lets me do that no problem, but my code doesn’t seem to recognize this new entity as a valid class. Is there a method to “refresh” the data model so the new entity will be accessible? Thanks for any insight here.

I did some google searches and found a suggestion to delete the app instance on the simulator and relaunch. This solved the problem and seems a good solution if still early in development. There seems to be other options for migration of data models in existing applications.