/**
  * Add owner to mediafiles table
  *
  * @param int $owner_id owner id
  * @param string $owner owner identification name
  * @param string $owner_attribute owner identification attribute
  * @return bool save result
  */
 public function addOwner($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();
 }