konvertere millisekunder til dato i mongodb aggregeringspipeline for gruppe efter?

Jeg prøver at finde logikken bag konvertering af txnTime felt til et datoobjekt, fordi gruppering efter enten et datofelt eller et tidsstempel i millisekunder (som hvad du gør i øjeblikket) vil give det samme resultat, da de begge er unikke i deres respektive formater!

For at ændre txnTime felt til et datoobjekt skal du derefter inkludere en $ projekt pipeline før $group pipelinestadiet med dette udtryk

 "txnTime": {
    "$add": [ new Date(0), "$txnTime" ]
}
 
 så du kan gøre din  $gruppe  
 operation på det konverterede/projekterede txnTime-felt:
 var convertedTxnTime = { "$add": [new Date(0), "$txnTime"] };

/*
  If using MongoDB 4.0 and newer, use $toDate 

  var convertedTxnTime = { "$toDate": "$txnTime" };

  or $convert

  var convertedTxnTime = { "$convert": { "input": "$txnTime", "to": "date" } };

*/

db.campaign_wallet.aggregate([
    { "$match": { 
        "campaignId" : 1 , 
        "txnTime" : { 
            "$gte" : 1429554600000 , 
            "$lte" : 1430159400000
        }
    } },
    { "$group" : { 
        "_id" : {
            "txnTime": convertedTxnTime,
            "msisdn" : "$msisdn"
        }, 
        "msisdnCount" : { "$sum" : 1}
    } }
]);
 
 Output :(baseret på eksempeldokumenterne fra denne spørgsmål
  )
 /* 0 */
{
    "result" : [ 
        {
            "_id" : {
                "txnTime" : ISODate("2015-04-25T18:30:00.000Z"),
                "msisdn" : "91808770101"
            },
            "msisdnCount" : 1
        }, 
        {
            "_id" : {
                "txnTime" : ISODate("2015-04-27T05:11:54.796Z"),
                "msisdn" : "9180877010"
            },
            "msisdnCount" : 1
        }, 
        {
            "_id" : {
                "txnTime" : ISODate("2015-04-25T18:30:01.111Z"),
                "msisdn" : "91808070101"
            },
            "msisdnCount" : 1
        }, 
        {
            "_id" : {
                "txnTime" : ISODate("2015-04-25T18:30:00.000Z"),
                "msisdn" : "91808070101"
            },
            "msisdnCount" : 2
        }, 
        {
            "_id" : {
                "txnTime" : ISODate("2015-04-27T05:11:54.796Z"),
                "msisdn" : "9189877000"
            },
            "msisdnCount" : 1
        }, 
        {
            "_id" : {
                "txnTime" : ISODate("2015-04-27T05:11:54.796Z"),
                "msisdn" : "9189877667"
            },
            "msisdnCount" : 1
        }
    ],
    "ok" : 1
}
 
 -- OPDATERING --
 
 For at gruppere dokumenterne efter dato med formatet ÅÅÅÅ-MM-DD , brug Date Aggregation Operators
  
 
 Eksempel:
 var convertedTxnTime = { "$add": [new Date(0), "$txnTime"] };

/*
  If using MongoDB 4.0 and newer, use $toDate 

  var convertedTxnTime = { "$toDate": "$txnTime" };

  or $convert

  var convertedTxnTime = { "$convert": { "input": "$txnTime", "to": "date" } };

*/

db.campaign_wallet.aggregate([
    { "$match": { 
        "campaignId" : 1 , 
        "txnTime" : { 
            "$gte" : 1429554600000 , 
            "$lte" : 1430159400000
        }
    } },
    { "$group" : { 
        "_id" : {
            "txnTime_year" : { "$year": convertedTxnTime },
            "txnTime_month" : { "$month": convertedTxnTime },
            "txnTime_day" : { "$dayOfMonth": convertedTxnTime },
            "msisdn": "$msisdn"
        }, 
        "msisdnCount" : { "$sum" : 1}
    } }
]);
 
 Output :
 /* 0 */
{
    "result" : [ 
        {
            "_id" : {
                "txnTime_year" : 2015,
                "txnTime_month" : 4,
                "txnTime_day" : 25,
                "msisdn" : "91808770101"
            },
            "msisdnCount" : 1
        }, 
        {
            "_id" : {
                "txnTime_year" : 2015,
                "txnTime_month" : 4,
                "txnTime_day" : 25,
                "msisdn" : "91808070101"
            },
            "msisdnCount" : 3
        }, 
        {
            "_id" : {
                "txnTime_year" : 2015,
                "txnTime_month" : 4,
                "txnTime_day" : 27,
                "msisdn" : "9180877010"
            },
            "msisdnCount" : 1
        }, 
        {
            "_id" : {
                "txnTime_year" : 2015,
                "txnTime_month" : 4,
                "txnTime_day" : 27,
                "msisdn" : "9189877000"
            },
            "msisdnCount" : 1
        }, 
        {
            "_id" : {
                "txnTime_year" : 2015,
                "txnTime_month" : 4,
                "txnTime_day" : 27,
                "msisdn" : "9189877667"
            },
            "msisdnCount" : 1
        }
    ],
    "ok" : 1
}