feat:前端商品分类模型增加beforesave方法，在beforesave中增加filter_attr字段的存储

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

@@ -120,4 +120,12 @@ class ShopCategory extends \yii\db\ActiveRecord
     {
         return $this->hasOne(File::className(), ['id' => 'icon']);
     }
+
+    public function beforeSave($insert)
+    {
+        if ($this->filter_attr != null && is_array($this->filter_attr)) {
+            $this->filter_attr = implode(',', $this->filter_attr);
+        }
+        return parent::beforeSave($insert); // TODO: Change the autogenerated stub
+    }
 }