MongoUtil.py 文件源码

def downvote_article(user, group_id, list_id, article_id):
    try:
        # Resources check
        article = Article.objects.get(id=ObjectId(article_id))
        group = Group.objects.get(id=ObjectId(group_id), lists=ObjectId(list_id), members=user)
        list = List.objects.get(id=ObjectId(list_id), articles=article)

        # Create new vote
        vote = check_vote_exist(list, article)
        if check_user_has_downvoted(user, vote):
            raise UserHasVoted('User cannot vote twice.')

        # User is just trying to take vote back
        if check_user_has_upvoted(user, vote):
            Vote.objects(id=vote.id).update_one(pull__upvoter_list=user, vote_count=vote.vote_count-1)
        else:
            # Downvote
            Vote.objects(id=vote.id).update_one(push__downvoter_list=user, vote_count=vote.vote_count-1)
    except Exception as e:
        return type(e).__name__

    vote.reload()
    return vote