core-data-migration - w3toppers.com

iPhone Core Data “Automatic Lightweight Migration”

To recap/Full guide: Before making any change, create a new model version. In Xcode 4: Select your .xcdatamodel -> Editor -> Add Model Version. In Xcode 3: Design -> Data Model -> Add Model Version. You will see that a new .xcdatamodel is created in your .xcdatamodeld folder (which is also created if you have … Read more

Example or explanation of Core Data Migration with multiple passes?

I’ve figured out what Apple hints in their documentation. It’s actually very easy but a long way to go before it’s obvious. I’ll illustrate the explanation with an example. The initial situation is this: Data Model Version 1 It’s the model you get when you create a project with the “navigation based app with core … Read more