code: def user_names_like(cls, user_name, db_session=None):
          
          db_session = get_db_session(db_session)
          query = db_session.query(cls.model)
          query = query.filter(
              sa.func.lower(cls.model.user_name).like((user_name or "").lower())
          )
          query = query.order_by(cls.model.user_name)
          # q = q.options(sa.orm.eagerload('groups'))
          return query
docs: fetch users with similar names using LIKE clause
  
          :param user_name:
          :param db_session:
          :return: