/**
  * afterDelete callback
  *
  * @param Model $Model Model using this behavior
  * @return boolean
  */
 public function beforeDelete(Model $Model, $cascade = true)
 {
     $tag_collection_id = $Model->field(self::TAG_FOREIGN_KEY);
     if (isset($tag_collection_id)) {
         $this->TagCollection->decrementInstances($tag_collection_id);
     }
 }