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

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.)

@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 }

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

I've submitted feedback FB14898357 on this.

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?

A code snippet might help.

I've updated my feedback to say that the problem exists when using Xcode 16 RC.

I received the following message from Apple Feedback Assistant. Thank you for filing the feedback report. We have deployed the fix. Please verify this issue with iOS 18.1 Beta 6 and update your bug report with your results by logging into https://feedbackassistant.apple.com/ or by using the Feedback Assistant app. iOS 18.1 Beta 6 (Build: 22B5069a) https://developer.apple.com/download/ Posted Date: October 7, 2024 I don't have iOS 18.1 Beta 6 on any of my devices. Is there anyone who does and can confirm the fix?

I'm still seeing the issue on Xcode 16.1 and iOS 18.1.

I am experiencing this issue as well.

I've been looking at the AI generated code and comparing to the code I wrote for the other apps. And I am confused. The AI generated code creates an Item enum and uses the PersistentIdentifier of the PersistentModel, but fetches the PersistentModel array instead of fetching an array of PersistentIdentifiers, which my hand-generated code does. Again, I am confused as to why this works and clears the Sendable warnings.