show_posts.py 文件源码

def aggregate_post_types():
    """
    counting the types of posts.


    :return: list of dicts each one contain type name and counter
    """
    pipeline = [
             {"$group": {"_id": "$type", "count": {"$sum": 1}}},
             {"$sort": SON([("count", -1), ("_id", -1)])}
            ]
    return posts.aggregate(pipeline)