protected function deleteLinked($user_id)
    {
        $this->db->delete('cart', array('user_id' => $user_id));
        $this->db->delete('review', array('user_id' => $user_id));
        $this->db->delete('history', array('user_id' => $user_id));
        $this->db->delete('address', array('user_id' => $user_id));
        $this->db->delete('wishlist', array('user_id' => $user_id));
        $this->db->delete('rating_user', array('user_id' => $user_id));
        $this->db->delete('dashboard', array('user_id' => $user_id));
    }