phpstock/app/admin/model/GoodStock.php

<?php
declare (strict_types = 1);

namespace app\admin\model;

use think\Model;

/**
 * @mixin \think\Model
 */
class GoodStock extends Model
{
    protected $createTime="addtime";
    protected $updateTime="updatetime";
    
    public function WsmInfo(){
    	return $this->belongsTo(WarehouseInfo::class,"wsm_code","wsm_code")->bind(["wsm_name"=>"name","wsm_supplierNo"=>"supplierNo","wsm_supplierName"=>"supplierName"]);
    }
    
    //组合商品占用 库存
    public function stockSub($spuCode,$num){
    	 $row =$this->withJoin(['wsminfo'],'left')
            ->field('good_stock.id,usable_stock')
            ->where(['spuCode' => $spuCode, 'wsm_type'=>[2,5]])
            ->where("usable_stock",">",0)
            ->select();
		 if($row->isEmpty()) throw new \Exception('未找到对应子商品库存信息');
		 $usable = array_sum(array_column($row->toArray(),"usable_stock"));
		 if($usable < $num)throw new \Exception('对应子商品库存数不足');
		    $returen=[];
			foreach ($row as $item){
				if($num<=0) break;
				if($item->usable_stock >= $num){
					$temp = $num;
					$num =0;
				}else{
					$temp = $item->usable_stock;
					$num =bcsub($num,$item->usable_stock);
				}
				$bn=GoodStockInfo::StockBnSub($item->id,intval($temp),1);
				$returen=array_merge($returen,$bn);
			}
			
			return $returen;
    }
    
}