2👍
✅
You have to call super with the current class, change super(ThumbnailBackend, self)
to super(MyThumbnailBackend, self)
, like this
class MyThumbnailBackend(ThumbnailBackend):
def _get_thumbnail_filename(self, source, geometry_string, options):
return super(MyThumbnailBackend, self)._get_thumbnail_filename(source, geometry_string, options)
Source:stackexchange.com