mongoDB 不同，在同一个查询中在哪里

假设我有以下文件

Article { Comment: embedMany }

Comment { Reply: embedMany }

Reply { email: string, ip: string }

我想做一个查询， Select distinct Reply.ip，其中Reply.email = xxx

像这样的东西，只是不起作用..

db.Article.find("Comment.Reply.email" : "xxx").distinct("Comment.Reply.ip")

JSON export:

{
   "_id":{
      "$oid":"4e71be36c6eed629c61cea2c"
   },
   "name":"test",
   "Comment":[
      {
         "name":"comment test",
         "Reply":[
            {
               "ip":"192.168.2.1",
               "email":"yyy"
            },
            {
               "ip":"127.0.0.1",
               "email":"zzz"
            }
         ]
      },
      {
         "name":"comment 2 test",
         "Reply":[
            {
               "ip":"128.168.1.1",
               "email":"xxx"
            },
            {
               "ip":"192.168.1.1",
               "email":"xxx"
            }
         ]
      }
   ]
}

I run : db.Article.distinct("Comment.Reply.ip",{"Comment.Reply.email" : "xxx"})

I expect : ["128.168.1.1", "192.168.1.1"]

I get : ["127.0.0.1", "128.168.1.1", "192.168.1.1", "192.168.2.1"]