I'm currently developping an app, which runs on several devices via TestFlight. Since I am still in an early stage my @Models are subject to change quite frequently.
I know that the preferred way of handling changes to the Schema are SchemaMigrationPlans. However due to the limited number of devices I don't want and need to create those. Instead I'd rather just erase the whole SwiftData storage, since I mostly use the storage for caching and widgets.
The problem is, that I cannot even initialize the ModelContainer to delete it afterwards
return try ModelContainer(for: ClassA.self, ClassB.self) // will throw an error
That means, that the only way to get the app running is to reinstall it. My desired behavior is
do {
let container = try ModelContainer(for: ClassA.self, ClassB.self)
return container
} catch {
resetSwiftData()
let container = try ModelContainer(for: ClassA.self, ClassB.self)
return container
}
How can I implement resetSwiftData(), if I cannot even create the ModelContainer to locate it?
If you are just using a simple on-disk container, then deleting the file at the container's URL would work. You can get the URL from the ModelConfiguration you used to create the model container.
do {
let container = try ModelContainer(for: ClassA.self, ClassB.self)
return container
} catch {
try FileManager.default.removeItem(at: ModelConfiguration(for: ClassA.self, ClassB.self).url)
let container = try ModelContainer(for: ClassA.self, ClassB.self)
return container
}