def edit_language_set_root_action(user_id, topic_id, root_id):
"""Add/Modify an Enlish topic as language root;No root can be added for English topic"""
topic = Topic.objects.get(pk=topic_id)
root = Topic.objects.get(pk=root_id)
if topic.language == 'en' or root.language != 'en':
return '只能由非英语话题指向英语话题'
else:
previous_root = topic.language_set_root
topic.language_set_root = root
topic.save()
reference = None #Initialize
if previous_root:
refs = Topic_Revision.objects.filter(topic__id=topic_id, operation='ml').order_by('-pk')
if refs:
reference = refs[0]
if reference.user_id != user_id:
notification = Notification(operation='ml')
notification.user_id = reference.user_id
notification.related_user_id = user_id
notification.topic_id = topic_id
notification.incr_count_in_profile()
notification.save()
update_user_topic_fame(topic_id, user_id, reference.user_id)
else:
reference = None
update_user_topic_fame(topic_id, user_id)
topic_revision = Topic_Revision(operation='ml', reference=reference)
topic_revision.topic_id = topic_id
if previous_root:
topic_revision.previous_root = previous_root
topic_revision.user_id = user_id
topic_revision.save()
return topic.pk
