public function addOwner($owner_id, $owner, $owner_attribute)
    {
        $mediafiles = new Owners();
        $mediafiles->mediafile_id = $this->id;
        $mediafiles->owner = $owner;
        $mediafiles->owner_id = $owner_id;
        $mediafiles->owner_attribute = $owner_attribute;

        return $mediafiles->save();
    }