feat:商品模型增加保存排序行为

backend/modules/goods/models/ars/Goods.php

@@ -237,6 +237,9 @@ class Goods extends \yii\db\ActiveRecord
         if (!$this->limit_count) {
             $this->limit_count = 0;
         }
+        if (!$this->sort_order) {
+            $this->sort_order = 999;
+        }
         return parent::beforeSave($insert); // TODO: Change the autogenerated stub
     }