modify pictorial sort

trans2es/models/topic.py

@@ -130,14 +130,15 @@ class Topic(models.Model):
             logging.error("catch exception,err_msg:%s" % traceback.format_exc())
             return False
 
-    def get_topic_image_num(self,topic_id):
+    @classmethod
+    def get_topic_image_num(cls,topic_id):
         """
         :remark 获取指定帖子的图片数量
         :param topic_id:
         :return:
         """
         try:
-            query_list = TopicImage.objects.using(settings.SLAVE_DB_NAME).filter(topic_id=topic_id, is_deleted=False, is_online=True).values_list("url",flat=True)
+            query_list = list(TopicImage.objects.using(settings.SLAVE_DB_NAME).filter(topic_id=topic_id, is_deleted=False, is_online=True).values_list("url",flat=True))
             return len(query_list)
         except:
             logging.error("catch exception,err_msg:%s" % traceback.format_exc())