Lightweight Migrations in Core Data TutorialThis is an abridged from our book Core Data by Tutorials, which has been completely updated for Swift 4 and iOS 11. This tutorial is presented as part of our iOS 11 Launch Party — enjoy! When you create a Core Data app, you design an initial data model for your app. However, after you ship your app inevitably you’ll want to make changes to your data model. What do you do then? You don’t want to br
