SOLVED: SwitData and NSEntityDescription error

@scvbrent

May '24

Attempting to use SwiftData and have run into an error that has me stumped.

BrentsMusicOffice crashed due to an uncaught exception NSInternalInconsistencyException. Reason: NSFetchRequest could not locate an NSEntityDescription for entity name 'Instrument'.

The app runs in the simulator correctly, but crashes when I go to the screen using the records of that model 'Instrument' in XCode when starting from ContentView.

I saw Paul's page about common swiftdata errors, but I believe I have the model listed in the modelContainer correctly:

var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .modelContainer(for: [
            StudentUser.self,
            Instrument.self
            Actor.self,
            MainActor.self
            ])
    }

There are lots of view files, so I hesistate to post all of those, perhaps someone has had a similar issue and can suggest where the error might be. Thanks!

@scvbrent

May '24

Found the error... it was in the preview code for ContentView - I had only placed the modelContainer for StudentUser.self, and had not included Instrument.self there. Adding Instrument.self fixed it.

#Preview {
    let config = ModelConfiguration(isStoredInMemoryOnly: true)
    let container = try! ModelContainer(for: StudentUser.self, Instrument.self, configurations: config)

        return ContentView()
            .modelContainer(container)
}

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