caiping/app/admin/model/AdminGroup.php

<?php
/**
 * @copyright Copyright (c) 2021 勾股工作室
 * @license https://opensource.org/licenses/Apache-2.0
 * @link https://www.gougucms.com
 */

namespace app\admin\model;

use think\Model;

class AdminGroup extends Model{
    protected $table = 'cp_admin_group';

    public function department(){
        return $this->hasOne('Department', 'id', 'unit_name')
                ->bind([
                    'd_title' => 'title',
                ]);
    }

    public function admin(){
        return $this->hasMany('Admin', 'admin_group_id', 'id');
    }

}