I'm using SwiftData and this command solved my problem. I am super thankful. Thank you! Also thanks to everybody else for all that helpful ideas like changing the preview device, or emptying ContentView and repopulating it.

thank you mate!

thanks, that helped! to translate this into reality, what you mean is: BEFORE #Preview { SomeView() } AFTER #Preview { NavigationView { SomeView() } }

It would be helpful if you could elaborate a bit on willMigrate and didMigrate. What exactly has to happen? lets assume we got wllMigrate { context in let oldDatamodel = try context.fetch(oldDataModelDescriptor) for oldData in OldDataModel { --> what happens here? } try? context.save() } didMigrate { context in let newDatamodel = try context.fetch(newDataModelDescriptor) for newData in NewDataModel { --> what happens here? } try? context.save() }