Javascript 添加缺失天数时间序列结果

Question

我有一个针对 Mongodb 的聚合操作的结果对象，结果如下所示:

[
    {
        "_id": {
            "action": "hit",
            "date": "2015-01-20T00:00:00.000Z"
        },
        "avg": 3,
        "min": 3,
        "max": 3,
        "total": 3
    },
    {
        "_id": {
            "action": "hit",
            "date": "2015-01-23T00:00:00.000Z"
        },
        "avg": 1,
        "min": 1,
        "max": 1,
        "total": 12
    }
]

我需要添加零值的缺失日期，例如，如果我要求从 1 月 20 日开始的一周范围，我希望有一个像这样的结果对象:

[
    {
        "_id": {
            "action": "hit",
            "date": "2015-01-20T00:00:00.000Z"
        },
        "avg": 3,
        "min": 3,
        "max": 3,
        "total": 3
    },
    {
        "_id": {
            "action": "hit",
            "date": "2015-01-21T00:00:00.000Z"
        },
        "avg": 0,
        "min": 0,
        "max": 0,
        "total": 0
    },
    {
        "_id": {
            "action": "hit",
            "date": "2015-01-22T00:00:00.000Z"
        },
        "avg": 0,
        "min": 0,
        "max": 0,
        "total": 0
    },
    {
        "_id": {
            "action": "hit",
            "date": "2015-01-23T00:00:00.000Z"
        },
        "avg": 1,
        "min": 1,
        "max": 1,
        "total": 12
    },
    {...}
]

具有日期范围的数组是这样的:

[ 
"2015-01-20T00:00:00.000Z",
"2015-01-21T00:00:00.000Z",
"2015-01-22T00:00:00.000Z",
"2015-01-23T00:00:00.000Z",
"2015-01-24T00:00:00.000Z",
"2015-01-25T00:00:00.000Z",
"2015-01-26T00:00:00.000Z",
]

对于此数组中的每个日期，我必须在之前的结果中添加一个零值对象。

我尝试了一些带有下划线和map/reduce/clone的东西，但我无法得到正确的结果。

请问有什么帮助吗？

Answer 1

我做到了，但我错过了添加零值，我现在就这样做。

        var cloneItem = {};

        // Generate the date range arrays with single days
        var range = moment().range(new Date(req.query.datefrom), new Date(req.query.dateto)),
            days = [];
        range.by('days', function(moment) {
            days.push(moment.startOf('day').format());
        });

        // Rewrite dates to match the same date range format from the array above
        webstat = _.map(webstat, function (value, key, list) {
            value._id.date = moment(value._id.date).startOf('day').format();
            if (key === 0) cloneItem = value;
            return value;
        });

        // Add the object values when they are missed               
        days.forEach(function (day) {
            var clone = _.extend({}, cloneItem, {_id: {action: cloneItem._id.action, date: day}});

            if (_.findWhere(webstat, {_id: { date: day}}) === undefined) {
                webstat.push(clone);
            }
        });

        // Sort by date and send it
        res.jsonp(
            _.sortBy(webstat, function (item) {
                return item._id.date;
            })
        );