youxiangjie/application/api/model/OrderCommodityModel.php

<?php
namespace app\api\model;
use think\Model;

class OrderCommodityModel extends Model
{
    protected $name = 'order_commodity';

    public function order()
    {
        return $this->belongsTo('order','o_id','o_id');
    }
    public function Commodity()
    {
        return $this->belongsTo('CommodityModel','c_id','c_id');
    }
}