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db.getCollection("ny_room_browse_record").aggregate(    [        {             "$match" : {                 "wechat_user_space_id" : 1            }        },         {             "$group" : {                 "_id" : {                     "room_id" : "$room_id",                     "room_name" : "$room_name"                },                 "count" : {                     "$sum" : NumberInt(1)                },            }        },         {             "$project" : {                 "room_id" : "$_id.room_id",                 "room_name" : "$_id.room_name",                 "count" : "$count",                 "_id" : "$_id"            }        },            ]);

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