Or is this, with the versioned schema plugged in more appropriate: let modelContainer: ModelContainer = { do { let schema = Schema(versionedSchema: AllSwiftDataSchemaV3.self) return try ModelContainer( for: schema, migrationPlan: PlanBriefMigrationPlan.self ) } catch { fatalError("ModelContainer failed: \(error.localizedDescription)") } }()

Thank you very much. Lastly, do you agree this is a perfectly good ModelContainer for my situation? var sharedModelContainer: ModelContainer = { let schema = Schema( [ SDPlanBrief.self, SDAirport.self, SDChart.self, SDIndividualRunwayAirport.self, SDLocationBrief.self ] ) let configuration = ModelConfiguration() do { return try ModelContainer(for: schema, migrationPlan: PlanBriefMigrationPlan.self, configurations: configuration) } catch { fatalError("error = \(error.localizedDescription)") } }()

Thank you for your response. I had actually read that post in depth before posting here. What I would really like to know is, am I doing anything wrong with my VersionedSchema, ModelContainer or @Models please? I have been looking all around and it is hard to find the right answer for my specific case where I have transitioned to a Versioned Schema where I have suddenly placed all my @Models in, and have also changed my ModelContainer. I actually initially built this new container like so as I thought this was correct for migration plans: actor ModelContainerActor { @MainActor static func container() -> ModelContainer { let schema = Schema( versionedSchema: AllSwiftDataSchemaV3.self ) let configuration = ModelConfiguration() let container = try! ModelContainer( for: schema, migrationPlan: PlanBriefMigrationPlan.self, configurations: configuration ) return container } } Which I believe may have been causing the crashes. I haven't had any crashes in the last 24 hours since changing to this container: var sharedModelContainer: ModelContainer = { let schema = Schema( [ SDPlanBrief.self, SDAirport.self, SDChart.self, SDIndividualRunwayAirport.self, SDLocationBrief.self ] ) let configuration = ModelConfiguration() do { return try ModelContainer(for: schema, migrationPlan: PlanBriefMigrationPlan.self, configurations: configuration) } catch { fatalError("error = \(error.localizedDescription)") } }() Your advice/analysis would be greatly appreciated, thank you so much.

I am wondering if having my container set up like this would be more correct? var sharedModelContainer: ModelContainer = { let schema = Schema( [ SDPlanBrief.self, SDAirport.self, SDChart.self, SDIndividualRunwayAirport.self, SDLocationBrief.self ] ) let configuration = ModelConfiguration() do { return try ModelContainer(for: schema, migrationPlan: PlanBriefMigrationPlan.self, configurations: configuration) } catch { fatalError("error = \(error.localizedDescription)") } }()