mongodb查询返回内嵌符合条件的文档

db.T_Forum_Thread.find({ "ThreadReply.ReplyContent" : /范甘迪/ }, { "ThreadReply.$" : 1, "ThreadContent" : 1 })

重点在于返回字段：ThreadReply.$：1

如果内嵌的数组有多个符合条件只返回了1条，，，待继续深究

db.test.aggregate(
    {"$unwind":"$favorite_shards"}, 
    {"$match":
        {"favorite_shards.sid": 
            {"$in": [NumberLong(578), NumberLong(577)]}
        }
    }, 
    {"$group":
         {"_id": "$_id", "favorite_shards":
            {'$push': "$favorite_shards"}
        }
    })     

db.web_mem_favorites.aggregate(
    {"$project":{"favorite_shards":"$favorite_shards"}},
    {"$unwind":"$favorite_shards"},
    {"$match":{"favorite_shards.sid": NumberLong(577)}}
)