MOngoDB根据条件使用不同字段查询groupby以返回最新记录

我想根据条件分组，其中我的目标字段可以是sender.category或receiver.category基于这些字段中的任何一个属于“cat1”的条件，并根据createdAt获取sender.id或receiver.id上每个字段的最后记录

示例Json1：

{
    "code" : "34242342",
    "name" : "name1",
    "amount" : 200,
    "sender" : {
        "id" : "fsrfsr3242",
        "name" : "name2",
        "phone" : "12345678",
        "category": "cat1"
    },
    "receiver" : {
        "id" : "42342rewr",
        "name" : "naem3",
        "phone" : "5653679755",
        "category": "cat2"
    },
    "message" : "",
    "status" : "done",
    "createdAt" : "2019-09-27T09:17:32.597Z"
}

示例Json2：

{
    "code" : "34242342",
    "name" : "name1",
    "amount" : 200,
    "sender" : {
        "id" : "fsrfsr3242",
        "name" : "name2",
        "phone" : "12345678",
        "category": "cat3"
    },
    "receiver" : {
        "id" : "42342rewr",
        "name" : "naem3",
        "phone" : "5653679755",
        "category": "cat1"
    },
    "message" : "",
    "status" : "done",
    "createdAt" : "2019-09-27T09:17:32.597Z"
}

查询：

[{$match: {
  $or: [{ "sender.category": 'cat1' }, {"receiver.category" : 'cat1'}]
}}, {$sort: {
  "createdAt": 1
}}, {$group: {
  _id: {sender :"$sender.id", reciever : "$receiver.id"},
  lastrecord: {
    $last: "$$ROOT"
  }
}}]

我只想返回最后一条记录，sender.id或receiver.id可以有多条记录，我只想检索最后一条记录。但是我的查询返回了多条记录。 如何根据上述条件仅获取最后一个，即最新的，并创建数据

样本输出：

{
            "lastrecord" : {
                "name" : "name1",
                "amount" : 1000,
                "sender" : {
                    "name" : "name2",
                    "phone" : "213232141",
                    "category" : "cat1"
                },
                "receiver" : {
                    "name" : "name",
                    "phone" : "321312412",
                    "category" : "cat2"
                },
                "status" : "done",
                "createdAt" : "2019-11-25T17:00:17.226+06:30"
            }
        }

---

我希望每个sender.id或receiver.id都有这个。请发布一个示例输出文档（以及相应的输入文档）。@prasad_uu我已经发布了一个示例输出文档“…但我的查询返回了多个记录”（针对每个组（发送者和接收者）？是，当

$last

为每组（发送方和接收方）选择最后一个时，它将返回两个的倍数。请参见上的示例。