<?php
/**
 * 购物车模型
*/
namespace app\common\model;
use think\model\concern\SoftDelete;
use think\Db;
class Cart extends Model
{
    protected $name = 'cart';
    protected $autoWriteTimestamp = true;
    
    //检查库存
    public static function checkStock($item_value, $goods_num,$goods_id)
    {
        $item_info = Db::name('goods_item')
            ->where(array('goods_id'=>$goods_id,'spec_value'=>$item_value))->find();
        if ($goods_num > $item_info['stock']) {
            return true;
        }
        return false;
    }
}