Xcode Version 15.0 beta 5 (15A5209g), SwiftData Problem - "The given data was not valid JSON."

My app uses a CloudKit public database and a private database. The image data in the public database is saved as a CKAsset and the data from the downloaded asset is saved in SwiftData. That data is not JSON data. Again, this works well until beta 5.

I filed a feedback on this.

Also seeing an issue here. Glad to know that I am not the only one.

Exact same issue. Storing image data in external storage worked perfectly until Beta 5.

Same issue here, it seems it can not support Data type right now in Xcode 15 beta 5. Even empty Data() will through this error.

@Model
final class Item {
 
    var data:Data
    
    init() {
       self.data = Data() // when using it in a certain view, the same error happens
    }
}

I did find a workaround for this, simply wrap your Data object in a Codable struct, like this...

struct DrawingData: Codable {
    var data: Data
    init(data: Data) {
        self.data = data
    }
}

When you initialize the Model class, make sure to call an init with drawingData (or whatever variable type, as long as it's a codable struct) that is of type DrawingData (or whatever you rename this to).

Prior to wrapping the Data object, I had the same crash you all are reporting.

I also filed feedback :)

May I see your initializer?

https://developer.apple.com/documentation/swiftdata/propertyoptions

https://developer.apple.com/documentation/swiftdata/propertyoptions/externalstorage

I was wondering if you need to define the data property as externalStorage?

Data is Codeable, but Data is not JSON. Again, one can code Data into JSON, but the Data is not JSON. So, the error message is bogus. I hope this issue has come to the attention of the Apple Developers.

Are there any Apple engineers out there that have seen this thread? Several of us filed a Feedback about this. I was just wondering if this is being brought to Apple's attention or whether we are whistling in the wind.

Looks like this has been fixed with Xcode 15 beta 6. Yay!