fix some code

api/topic.py

@@ -116,7 +116,7 @@ class TopicUpdateOrCreateView(APIView):
 
     def post(self, request):
         id = request.POST.get('id', '')
-        topic_images = list(map(lambda x: x[:-2], json.loads(request.POST.get('topic_images', []))))
+        topic_images = list(map(lambda x: x[:-2], json.loads(request.POST.get('topic_images', '[]'))))
         tag_ids = list(map(lambda x: x.split(':')[0], json.loads(request.POST.get('tags', '[]'))))
         collection_tag_ids = list(map(lambda x: x.split(':')[0], json.loads(request.POST.get('collection_tags', '[]'))))
         pictorial_ids = list(json.loads(request.POST.get('pictorial_ids', '[]')))
@@ -126,14 +126,14 @@ class TopicUpdateOrCreateView(APIView):
             'video_url': request.POST.get('video_url', ''),
             'posting_time': request.POST.get('posting_time'),
             'content': request.POST.get('content', ''),
-            'content_level': request.POST.get('content_level', ''),
+            'content_level': request.POST.get('content_level', 0),
             'pictorial_ids': pictorial_ids,
             'user_id': request.POST.get('user', '').split(':')[0],
             'star_id': request.POST.get('star', '').split(':')[0],
             'tag_ids': tag_ids,
             'collection_tag_ids': collection_tag_ids,
-            'is_online': int(request.POST.get('is_online')),
-            'drop_score': int(request.POST.get('drop_score')),
+            'is_online': int(request.POST.get('is_online', 0)),
+            'drop_score': int(request.POST.get('drop_score', 0)),
             'has_image': 1 if topic_images else 0,
             'has_video': 1 if request.POST.get('video_url', '') else 0,
             'is_home': int(request.POST.get('is_home', 0)),