Node.js 如何获取从开始日期到当前日期的订户总数？_Node.js_Mongodb_Mongoose_Mapreduce_Aggregation Framework

Node.js 如何获取从开始日期到当前日期的订户总数？

node.js mongodb mongoose mapreduce

Node.js 如何获取从开始日期到当前日期的订户总数？,node.js,mongodb,mongoose,mapreduce,aggregation-framework,Node.js,Mongodb,Mongoose,Mapreduce,Aggregation Framework,我对MongoDB和mongoose非常陌生，我想了解从开始日期到当前日期的每日订户总数。换句话说，我需要按天对我的所有订户进行分组，每天我需要对我以前的所有订户进行合计 { "count" : 2, "subscribeDate" : "2016-05-28" } { "count" : 6, "subscribeDate" : "2016-05-29" } { "count" : 3, "subscribeDate" : "2016-05-30" } 以下是我的一些文件： { "_id"

我对MongoDB和mongoose非常陌生，我想了解从开始日期到当前日期的每日订户总数。换句话说，我需要按天对我的所有订户进行分组，每天我需要对我以前的所有订户进行合计

{ "count" : 2, "subscribeDate" : "2016-05-28" }
{ "count" : 6, "subscribeDate" : "2016-05-29" }
{ "count" : 3, "subscribeDate" : "2016-05-30" }

以下是我的一些文件：

{ "_id" : ObjectId("574cef8ee62502d08f34c075"), "userId" : "a7zd609h54wm5kt", "subscribedAt" : ISODate("2016-05-30T18:22:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.098Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c076"), "userId" : "3q2tvd53zcap5mq", "subscribedAt" : ISODate("2016-05-30T19:52:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.113Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c077"), "userId" : "nvx8mnu1xis5jxt", "subscribedAt" : ISODate("2016-05-28T19:52:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.117Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c078"), "userId" : "l7eedg616r0zbdf", "subscribedAt" : ISODate("2016-05-28T16:28:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.122Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c079"), "userId" : "9r1wl8ao8bls7g7", "subscribedAt" : ISODate("2016-05-28T11:05:05Z"), "isSubscribed" : false, "createdAt" : ISODate("2016-05-31T01:57:34.125Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c07a"), "userId" : "ygwve2e47p7fanl", "subscribedAt" : ISODate("2016-05-29T00:28:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.125Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c07b"), "userId" : "1gxspx9jypwc9tu", "subscribedAt" : ISODate("2016-05-29T19:52:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.127Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c07c"), "userId" : "hvy4xjppos8ch2b", "subscribedAt" : ISODate("2016-05-29T01:36:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.127Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c07d"), "userId" : "bmpql2d7wkl0jnw", "subscribedAt" : ISODate("2016-05-29T21:50:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.127Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c07e"), "userId" : "uir99sy6q3p6i0i", "subscribedAt" : ISODate("2016-05-29T08:22:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.131Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c07f"), "userId" : "qmzn3rz308ku017", "subscribedAt" : ISODate("2016-05-29T22:02:05Z"), "isSubscribed" : false, "createdAt" : ISODate("2016-05-31T01:57:34.132Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c080"), "userId" : "ok46sxaf8urrqtj", "subscribedAt" : ISODate("2016-05-29T07:33:05Z"), "isSubscribed" : false, "createdAt" : ISODate("2016-05-31T01:57:34.132Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c081"), "userId" : "ot4nmxqsn4o98vn", "subscribedAt" : ISODate("2016-05-29T23:52:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.138Z"), "__v" : 0 }
{ "_id" : ObjectId("574cef8ee62502d08f34c082"), "userId" : "2voy5ttkk39i1f0", "subscribedAt" : ISODate("2016-05-30T00:52:05Z"), "isSubscribed" : true, "createdAt" : ISODate("2016-05-31T01:57:34.138Z"), "__v" : 0 }

所以我在2016-05-28有2个订户，2016-05-29有6个订户，2016-05-30有3个订户

我希望达到的结果是这样的

{
    "results" : [
        {
            "date" : ISODate("2016-05-28T00:00:00Z"),
            "subscribers" : 2
        },
        {
            "date" : ISODate("2016-05-29T00:00:00Z"),
            "subscribers" : 8
        },
        {
            "date" : ISODate("2016-05-30T00:00:00Z"),
           "subscribers" : 11
        },
    ]
}

我用以下代码尝试了聚合框架：

var express = require('express'),
    router  = express.Router(),
    User    = require('../models/user');

router.get('/', function(req, res, next) {
    User.aggregate([
        {
            $match: { isSubscribed: true, subscribedAt: {$gte: new Date("2016-05-28T00:00:00+01:00"), $lte: new Date()}}
        }, 
        {
            $group: {
                _id: {$dateToString: { format: "%Y-%m-%d", date: "$subscribedAt" }},
                count : { $sum : 1 }
            },
        }, 
        {
            $project: {
                _id             : 0,
                subscribeDate   : "$_id",
                count           : 1
            }
        },
        {
            $sort: {subscribeDate: 1} 
        }
    ], function(err, result){
        if (err) {
            console.log("This is an error find the user!")
        }
        res.render('dashboard', {results: result, title: "Welcome to analytics dashboard!"});
    });

});
module.exports = router;

var express = require('express'),
    router  = express.Router(),
    User    = require('../models/user'),
    DailySubscriber    = require('../models/dailySubscriber');

router.get('/', function(req, res, next) {
    var userObject = {
        "query": {isSubscribed: true},
        "out": "dailySubscriber"
    };
    userObject.map = function () { 
        var date = new Date(this.subscribedAt.valueOf() - (this.subscribedAt.valueOf() % (1000 * 60 * 60 * 24 )));
        emit(date, 1) 
    }
    userObject.reduce = function (k, vals) { return vals.length }
    User.mapReduce(userObject, function (err, results) {
    //console.log(results)
    })

    var subscriberObject = {
        "scope": { "total": 0 },
        "finalize": function(key, value) {
            total += value;
            return total;
        },
        "out": "totalSubscriber"
    };

    subscriberObject.map = function () { 
        emit(this._id, this.value) 
    }
    subscriberObject.reduce = function (k, vals) { return vals.length }
    DailySubscriber.mapReduce(subscriberObject, function (err, total) {
        console.log("This is the result" + total)
    })

    res.render('dashboard', {title: "Welcome to analytics dashboard!"});
});
module.exports = router;

但这只给出了每天的总订户，而不是之前所有订户的总和

{ "count" : 2, "subscribeDate" : "2016-05-28" } { "count" : 6, "subscribeDate" : "2016-05-29" } { "count" : 3, "subscribeDate" : "2016-05-30" }
我还尝试了mapReduce，建议使用以下代码：

var express = require('express'), router = express.Router(), User = require('../models/user'); router.get('/', function(req, res, next) { User.aggregate([ { $match: { isSubscribed: true, subscribedAt: {$gte: new Date("2016-05-28T00:00:00+01:00"), $lte: new Date()}} }, { $group: { _id: {$dateToString: { format: "%Y-%m-%d", date: "$subscribedAt" }}, count : { $sum : 1 } }, }, { $project: { _id : 0, subscribeDate : "$_id", count : 1 } }, { $sort: {subscribeDate: 1} } ], function(err, result){ if (err) { console.log("This is an error find the user!") } res.render('dashboard', {results: result, title: "Welcome to analytics dashboard!"}); }); }); module.exports = router;

var express = require('express'), router = express.Router(), User = require('../models/user'), DailySubscriber = require('../models/dailySubscriber'); router.get('/', function(req, res, next) { var userObject = { "query": {isSubscribed: true}, "out": "dailySubscriber" }; userObject.map = function () { var date = new Date(this.subscribedAt.valueOf() - (this.subscribedAt.valueOf() % (1000 * 60 * 60 * 24 ))); emit(date, 1) } userObject.reduce = function (k, vals) { return vals.length } User.mapReduce(userObject, function (err, results) { //console.log(results) }) var subscriberObject = { "scope": { "total": 0 }, "finalize": function(key, value) { total += value; return total; }, "out": "totalSubscriber" }; subscriberObject.map = function () { emit(this._id, this.value) } subscriberObject.reduce = function (k, vals) { return vals.length } DailySubscriber.mapReduce(subscriberObject, function (err, total) { console.log("This is the result" + total) }) res.render('dashboard', {title: "Welcome to analytics dashboard!"}); }); module.exports = router;
当我运行我的节点应用程序时，这不起作用，我在控制台中得到了错误
这是未定义的结果
，但它在MongoDB Shell中起作用，结果非常接近我想要的，但仍然不太理想，因为它总是显示
\u id
和
value
作为键和值

{ "results" : [ { "_id" : ISODate("2016-05-28T00:00:00Z"), "value" : 2 }, { "_id" : ISODate("2016-05-29T00:00:00Z"), "value" : 8 }, { "_id" : ISODate("2016-05-30T00:00:00Z"), "value" : 11 }, ] }
最好的方法是什么？如果有帮助的话，我正在使用Node.js、Express和Mongoose

任何帮助都将不胜感激！提前谢谢
imho-我们可以从mongo中榨取的最好的东西是使用聚合框架来进行每日汇总。由于（来自sql world）我们没有CTE，我们无法参考之前的文档，这使得一些分析变得困难
在这种情况下，我将只做简单的forEach循环，并在这种特殊情况下更新sum值，创建移动sum。这将要求数据需要从最旧到最新进行排序。下面是一个sudocode：

var previous = 0; forEach (var r in result) { r.count += previous; previous = r.count; }