MongoDB:是否可以从使用“$ne”的项目的数组中返回其他值?

can蒙古人 $ne 返回值 $project 而不是 true 或 false 是吗?

文件:

{
    "_id" : ObjectId("5d1449db6f934a2926c175d1"),
    "clients" : [ 
        "82", 
        "85"
    ],
    "roomId" : 1,
    "message" : [ 
        {
            "time" : ISODate("2019-06-27T04:44:49.528Z"),
            "status" : "SEND",
            "text" : "Ellorad",
            "sender" : "82",
            "reciever" : "82",
            "_id" : ObjectId("5d1449db6f934a2926c175d2")
        }, 
        {
            "time" : ISODate("2019-06-27T04:44:49.528Z"),
            "status" : "SEND",
            "text" : "helas veronaaah",
            "sender" : "82",
            "reciever" : "85",
            "_id" : ObjectId("5d1449ff6f934a2926c175d3")
        }
    ]
}

我的尝试:

    Chat.aggregate([
      { $match: { clients: 82 } },
      {
        $project: {
          _id: '$roomId',
          receiver: { $ne: ['$clients', 82] },
          message: { $slice: ['$message', -1] }
        }
      }
    ])

结果是:

{
  "message": [
    {
      "_id": 1,
      "receiver": true
      "message": [
        {
          "time": "2019-06-27T04:44:49.528Z",
          "status": "SEND",
          "text": "helas veronaaah",
          "sender": "82",
          "reciever": "85",
          "_id": "5d1449ff6f934a2926c175d3"
        }
      ]
    }
  ]
}

所以接收者只是在这里返回对或错,这是对的,考虑到它 新台币 但是我想要的结果是,这里的接收者是“85”,而不是 对 或 错误