设置库存配置

app/common/model/StockDetail.php

@@ -34,8 +34,8 @@ class StockDetail extends BaseModel
             if(empty($row)){
                   self::create(['key' => $key,'num' => $num, 'type_id'=> $type]);
             }else{
-                  $stock = $row->num;
-                  $row->num = bcadd($row->num, $num, 2);
+                  $stock      = bcadd($row->num, $num, 2);
+                  $row->num   = $stock;
                   $row->save()?true:false;
             }
             return $stock;