Bug: Keys not clearing for extended DataObjects

[chrispenny]

Setup

class Video extends Image
{
  ... whatever you want
}

The intention of the setup below is that MyBlock could have an Image or a Video assigned to it.

class MyBlock extends BaseElement
{
  private static array $has_one = [
    'Image' => Image::class,
  ];

  private static array $cares = [
    'Image',
  ];
}

Result

If you assign an Image to this relationship, then changes to the Image correctly invalidate the cache for MyBlock.

If you assign a Video to this relationship, then changes to the Video do not invalidate the cache for MyBlock.

I thought I had covered this already, but I guess not. There must be an issue with the way we fetch Edges, in that it's not considering that it could be a descendant of the $from class that is trying to retrieve the Edge, or potentially we should be creating Edges for each valid $from class.

At the moment, it seems like we create one Edge $from Image $to MyBlock.