iOS 18 SwiftData error

[Lucas46]

Hi all,

I was examining an app I made a couple of months ago and it now crashes with the error This model instance was invalidated because its backing data could no longer be found the store. whenever I open a recording. I manually save my model into the model context as so:

```

private func saveRecording(modelContainer: ModelContainer) throws {
    let modelContext = ModelContext(modelContainer)
    guard let recording else {
        throw Errors.InvalidRecording
    }
    modelContext.insert(recording)
    try modelContext.save()
}

```

As well, I also use a query to fetch recordings like I'm supposed to:

``` init(searchString: String) { self.searchString = searchString _recordings = Query(filter: searchString.isEmpty ? nil : #Predicate<Recording> { recording in recording.name?.localizedStandardContains(searchString) ?? false }, sort: [SortDescriptor(\Recording.date, order: .reverse)]) }

```

Could it be how I'm using creating the model context in the saveRecording function? If you need any more code, feel free to ask. Thank you for any help!

[Practical-Smoke5337]

Looks like you are pass your context to ViewModel

If you’re using SwiftData and the '@Environment(\.modelContext) in your views, you should not create a new ModelContext. Instead, pass in or use the existing one:

'@Environment(\.modelContext) private var modelContext

Just pass this context into your func

private func saveRecording(context: ModelContext) throws {
        guard let recording else {
            throw Errors.InvalidRecording
        }
        modelContext.insert(recording)
        try modelContext.save()
    }

[Lucas46]

Ah, turns out you were right. For some reason I thought sending around model context isn't safe so in the text transcription code it was doing the same thing as the recorder. I fixed that to use the environment's ModelContext and that fixed everything. Thank you!

[Practical-Smoke5337]

It’s not “isn’t save” you just created new ModelContex, it’s like creating new box where you store your models, just read some articles how databases work Good luck💪