June 2016
Beginner to intermediate
240 pages
6h 17m
English
Content preview from Core Data in Objective-C, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial



A Simple Migration
To demonstrate a simple migration, let’s add the ability to attribute recipes to authors. To begin the versioning, the first thing we need to do is create a new managed object model (MOM) based on the first one. To do that, we select the existing model in Xcode and then choose Design > Data Model > Add Model Version.