def update_user_topic_fame(topic_id, current_user_id, previous_user_id=None):
"""
Updates the topic_action_count and reverted_in_topic_count field in User_Topic_Fame
for all the changes that are involved with topic management(not including add/delete item_topic)
current_user is the one who did this operation, while previous user is the one whose operation gets reverted
"""
if previous_user_id:
utf_previous = User_Topic_Fame.objects.get(user__pk=previous_user_id, topic__pk=topic_id)
utf_previous.reverted_in_topic_count = utf_previous.reverted_in_topic_count + 1
utf_previous.save()
utf_current_set = User_Topic_Fame.objects.filter(user__pk=current_user_id, topic__pk=topic_id)
if utf_current_set:
utf_current = utf_current_set[0]
utf_current. topic_action_count = utf_current.topic_action_count + 1
utf_current.save()
else:
utf_current = User_Topic_Fame()
utf_current.topic_id = topic_id
utf_current.user_id = current_user_id
utf_current.topic_action_count = 1
utf_current.save()
return "success"
