/**
  * Dislike an item
  *
  * @example $this->Post->dislike(1, $this->Auth->user('id))
  * @param int $foreign_id ID of the item
  * @param int $user_id ID the user
  */
 public function dislike(Model $Model, $foreign_id, $user_id)
 {
     if (!$Model->exists($foreign_id)) {
         throw new NotFoundException();
     }
     if (!$Model->isLikedBy($foreign_id, $user_id)) {
         throw new NotLikedException();
     }
     $like = $Model->Like->find('first', array('conditions' => array('Like.model' => $Model->alias, 'Like.foreign_id' => $foreign_id, 'Like.user_id' => $user_id)));
     $Model->Like->delete($like['Like']['id']);
     $Model->getEventManager()->dispatch(new CakeEvent('Plugin.Like.dislike', $like));
 }