Based on my testing if you define inverse relationship then nil comparison works on Xcode Version 15.0 (15A240d)

Yes I am also facing the same issue, problem is there seems to be no way to compare enum, comparing enum always fails and comparing using rawValue crashes. Could you file a feedback, hopefully it gets fixed. https://developer.apple.com/documentation/swiftdata/preservingyourappsmodeldataacrosslaunches# claims that enum is supported however I am not sure how to get it to work.

I forgot to add the code for App, any help on this would be much appreciated. SwiftDataEnumDemoApp import SwiftUI import SwiftData @main struct SwiftDataEnumDemoApp: App { var body: some Scene { WindowGroup { ContentView() .modelContainer(for: Car.self) } } }

@alexanderwe Has anyone tried using enum inside the Query predicate? For me enum gets saved however doesn't work with Query Refer https://developer.apple.com/forums/thread/737929

Can you provide a minimum reproducible code so that others can help

Can you try quitting Xcode, clearing DerivedData and trying again?

When I click the add button I get the message printed item save sucessfully. I have tested your code on macOS Sonoma release candidate (macOS 14.0 (23A339)) with Xcode Version 15.0 (15A240d)

If possible also add the tag Swift, IMHO it might help to ask in swift.org (https://forums.swift.org/c/swift-users/15) and please cross link this post.

I feel even #Predicate<Entry>{$0.item == name} should work, give it a try without storing it in a variable.

Given below is my understanding (I could be wrong). It looks like a concurrency issue. @Observable does ensure properties are accessed on the main thread, so it is thread safe. However by accessing a static property containing the AppModel, the AppModel might not longer guarantee thread safety. Based on the crash it seems like it is caused by simultaneous access (possibly from different threads). Debug Turn on Swift Strict Concurrency to complete to spot any warnings thrown by the compiler. Solution If you want to pass around the model use @Environment across views and access them across views If you have different models and need to talk to each other find ways to isolate and protect access using actors.

I have created a default SwiftData app by selecting the storage as SwiftData. The app runs fine on iOS simulator, there is no crash. I am using Xcode 15 Beta 6. Do you have any framework that you have added to your project? Can you clear DerivedData and create a new project and test using Xcode Beta 6?

Just curious: Why do you need a shared static property on AppModel? Since Folder conforms to identifiable in SidebarView could you just use ForEach(folders) { folder in? Note: I don't have an iOS 17 device so couldn't test it on real device. Could you make the above 2 changes mentioned and test it? Just trying to understand what causes the crash?

Based on my experience, using self inside #predicate is not allowed. Do you have unique identifier field for Item? If so store that then use unique identifier in a variable and then use id inside your #predicate. Assume name is the unique identifier then use the following code example: let id = self.name let predicate = #predicate { $0.item.name == id } ....

Try removing didSet and try it Try removing private set One way to isolate the problem is to keep commenting out and simplifying your model till it no longer crashes and then you can isolate the problem. Then file a feedback with the isolated problem.

Not sure this helps, on iOS 17 there is an API called scrollPosition which is an alternate to ScrollViewReader Refer: https://developer.apple.com/wwdc23/10159