A code snippet might help.

I'm easter egging here. Could it be something like the objective c array is a reference type and the [String] is a value type?

I've submitted feedback FB14898357 on this.

Problem solved by insuring that the task is on the main actor. I've removed the feedback.

@FPST I had to write a method that returned the models from a sorted fetch and then get their PersistentIdentifiers. public func fetchSort<T: PersistentModel>(_ descriptor: FetchDescriptor<T>) throws -> [PersistentIdentifier] { var result = [PersistentIdentifier]() var models = [T]() models = try self.modelContext.fetch(descriptor) for model in models { let pID = model.persistentModelID result.append(pID) } return result }

let fetchDescriptor = FetchDescriptor() works fine, but let fetchDescriptor = FetchDescriptor<MyModel>(sortBy: [SortDescriptor( \.title)]) fails with The operation couldn’t be completed. (SwiftData.SwiftDataError error 1.)

I see where you define container1. You have a private var context which you never initialize like context = ModelContext(container1).

I filed a feedback on the crash. It's FB14766558.

I have two screenshots of the threads, one under Swift 5 and one under Swift 6. I set a breakpoint in the updateView method. The Swift 5 run gets to the breakpoint. The Swift 6 run does not and crashes. Swift 5 Swift 6 Any help would be most appreciated. Or maybe this is ripe for a bug report?

I've discovered where the crash is occurring. I have an @objc function called updateView() that is fired when the view controller detects NSPersistenStoreRemoteChange. As soon as I save an object in another view, the update fires and the app crashes. NotificationCenter.default.addObserver(self, selector: #selector(updateView(_ :)), name: .NSPersistentStoreRemoteChange, object: nil) The crash does not occur using Swift 5.

I now understand the the warnings go away under Swift 6 as 'InferSendableFromCaptures' has been enabled. I still have the crash. Guess I better dig in.

I don't see where you used the @Model macro to change your classes into SwiftData. Did I miss something?

I've changed to using @precurrency given your write up.

@DTS Engineer, here's an example of what I did. nonisolated func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { Task { await changeMyLocation(locations) } } func changeMyLocation(_ locations: [CLLocation]) { myLocation = locations.last } I created a function to change the location and called it via a task.

I've fixed this by creating a struct for the data returned by SwiftData. I stuff the struct with the SwiftData and use the struct in my UICollectionViewDiffableDataSource. I am using SwiftData with UIKit.