Hi I am trying to figure out how to properly migrate my schema when a field in my model needs to become a different type. I start with a simple model User with an array of type String called friends @Model final class User { @Attribute(.unique) var id: String var friends: [String]? } Now I want to change the type of friends to [User]? but I am unsure how to make a migration plan for this. I created two versioned schemas enum UserSchemaV1: VersionedSchema { static var versionIdentifier = Schema.Version(1, 0, 0) static var models: [any PersistentModel.Type] { [User.self] } @Model final class User { @Attribute(.unique) var id: String var friends: [String]? } } enum UserSchemaV2: VersionedSchema { static var versionIdentifier = Schema.Version(2, 0, 0) static var models: [any PersistentModel.Type] { [User.self] } @Model final class User { @Attribute(.unique) var id: String var friends: [User]? } } Then I make a migration plan enum UsersMigrationPlan: SchemaMigrationPlan { static var stages: [MigrationStage] { [migrateV1toV2] } static var schemas: [any VersionedSchema.Type] { [UserSchemaV1.self, UserSchemaV2.self] } static let migrateV1toV2 = MigrationStage.custom( fromVersion: UserSchemaV1.self, toVersion: UserSchemaV2.self, willMigrate: nil, didMigrate: nil ) } And I make a container using my migration plan let container: ModelContainer init() { do { container = try ModelContainer(for: User.self, migrationPlan: UsersMigrationPlan.self ) } catch { fatalError("Failed to initialize user model container") } } I also use a typealias so I can keep using User in my code typealias User = UserSchemaV2.User But no matter what I try I get an error when running my code Thread 1: Fatal error: Unknown related type - User In the closure for v2 of the Schema set { _$observationRegistrar.withMutation(of: self, keyPath: \.friends) { self.setValue(forKey: \.friends, to: newValue) } } What am I misunderstanding about migrating my schema with this change? Is this something that's possible when doing a schema migration? Is there a simple/better/easier way to modify my schema to change the type of the field?