【学生管理系统】element ui级联菜单bug

    @GetMapping("/{parentId}")
    public BaseResult findAllByParentId(@PathVariable("parentId") String parentId){
        //1 根据父id查询所有城市
        QueryWrapper<TbCity> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("parent_id",parentId);
        List<TbCity> list = tbCityService.list(queryWrapper);

        //2 返回结果
        return BaseResult.ok("查询成功", list);
    }