coupon-admin/app/model/Business.php

<?php

namespace app\model;

class Business extends Base
{
    const state_reviewing = 0;
    const state_on        = 1;
    const state_off       = 2;

    public function category()
    {
        return $this->hasOne(Category::class, 'id',"type");
    }
    public function account()
    {
        return $this->hasOne(Account::class, 'business_code',"code");
    }
    public function agency()
    {
        return $this->hasOne(self::class,"code","agency_code");
    }
}