admin/app/outside/modules/order/models/Order.php

<?php

namespace app\outside\modules\order\models;

class Order extends \app\common\models\Order
{
    public $appends = [];
    public $with = [];

    public function orderGoods()
    {
        return $this->hasMany(OrderGoods::class, 'order_id', 'id'); // TODO: Change the autogenerated stub
    }
}