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)}}
)