yxy/app/admin/model/Borrow.php

<?php

namespace app\admin\model;

use think\Model;
use think\model\concern\SoftDelete;

class Borrow extends Model
{
    use SoftDelete;
    protected $deleteTime = 'delete_time';

    public function Admin()
    {
        // 指定关联Admin模型的数据库连接
        return $this->hasOne(Admin::class, 'id','user_id');
    }
}