project/app/cxinv/model/ProductsCombind.php

<?php
namespace app\cxinv\model;

use think\model\concern\SoftDelete;
class ProductsCombind extends Base
{
    use SoftDelete;
//设置字段信息
    protected $schema = [
        'id'  =>'bigint',//
        'parent_id'  =>'bigint',//组合商品id
        'child_id'  =>'bigint',//子商品id
        'child_num'  =>'int',//子商品每单位对应数量
        'create_time'  =>'datetime',//
        'delete_time'  =>'datetime',//
       ];
    protected $createTime = 'create_time';
    protected $updateTime = false;
    protected $deleteTime = 'delete_time';

    public function Products(){
        return $this->hasOne('FinancialProducts','id','child_id');
    }

    public static function CombindAddStock($pid,$num){

    }
}