My DataObject has one Image.

I want to display the DataObject in JSON. In addition, I want to add the Image.Filename to the JSON Array.

$query = "SELECT * FROM Object LEFT JOIN File ON Object.ImageID = File.ID";
$records = DB::query($query);
return $f->convertDataObjectSet($records);

I guess that the $records object is no DataObjectSet, so JSON does not work. Although it works when doing DataObject::get("Object)!

Could you please tell me how to convert the $records object to JSON? (Or is there a better way of doing this?)

Thank you!