dlh_test_server/app/common/model/BusinessSchool.php

<?php

namespace app\common\model;

use app\common\basics\Models;
use think\facade\Config;

class BusinessSchool extends Models
{
    public function category()
    {
        return $this->hasOne('BusinessSchoolCategory', 'id', 'cid');
    }

    public function getVideoAttr($value)
    {
        if ($value) {
            return Config::get('aliyunoss.domain') . $value;
        }
    }
}