使用pushwith硬编码字段对文档字段进行分组

Question

我有下面给出的文件

{
    "_id" : ObjectId("5b44cb8b44a531b12aa69678"),
    "Empid" : 1,
    "Empname" : "Raghu",
    "Deptid" : "D1",
    "Depname" : "IT",
    "Salary" : 15000,
    "Time" : "8 Hours"
}

{
    "_id" : ObjectId("5b44cbda44a531b12aa69679"),
    "Empid" : 1,
    "Empname" : "Raghu",
    "Deptid" : "D2",
    "Depname" : "Soft",
    "Salary" : 25000,
    "Time" : "9 Hours"
}

无需对字段进行硬编码，除了按字段分组

db.tbljournal.aggregate(

// Pipeline
[
    // Stage 1
    {
        $group: {
            _id: {
                Jid: '$Jid',
                JName: '$JName'
            },
            Article: {
                $addToSet: {
                    "ArtNo": "$ArtNo",
                    "ArtName": "$ArtName",
                    "Department": {
                        "CE": "$CE",
                        "Dept": "$Dept",
                        "CEInDate": "$CEInDate",
                        "DeptInDate": "$DeptInDate"
                    }
                }
            }
        }
    },
    { $sort : {_id:1, ArtNo:-1} }
    ]
).pretty();

我希望输出如下。

{
        "_id" : {
                "Jid" : "101",
                "JName" : "Artery"
        },
        "Article" : [
                {
                        "ArtNo" : "2",
                        "ArtName" : "Blood",
                        "Department" : {
                                "CE" : "CE2",
                                "Dept" : "CopyEditing",
                                "CEInDate" : "2018-07-10",
                                "DeptInDate" : "2018-07-10"
                        }
                },
                {
                        "ArtNo" : "1",
                        "ArtName" : "Nervous",
                        "Department" : {
                                "CE" : "CE1",
                                "Dept" : "Pagination",
                                "CEInDate" : "2018-07-10",
                                "DeptInDate" : "2018-07-10"
                        }
                }
        ]
}