如何按日期对对象进行分组? [英] How to group by object by date?
本文介绍了如何按日期对对象进行分组?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在从数据库中获取数据,我想明智地发送响应日期.
I fetching data form database and I want to send response date wise.
我希望按日期将我的数据分组帮助一点.
I want little bit of help in group By my data with date wise.
我有如下对象
var IHAVE = [{
"foodId": "59031fdcd78c55b7ffda17fc",
"qty": 1,
"dateTime": "2017-07-26T12:03:06.000Z",
"_id": "591c3bfcca93e86c3450a537"
}, {
"foodId": "59031fdcd78c55b7ffda17fc",
"qty": 1,
"dateTime": "2017-05-18T04:21:13.000Z",
"_id": "591d213b6878badb0621b840"
}, {
"foodId": "59031fdcd78c55b7ffda17fc",
"qty": 1,
"dateTime": "2017-07-26T12:03:010.000Z",
"_id": "591c3bfcca93e86c3450a537"
},{
"foodId": "59031fdcd78c55b7ffda17fc",
"qty": 1,
"dateTime": "2017-05-18T04:22:01.000Z",
"_id": "591d216a6878badb0621b842"
}];
我想要如下
var IWANT = [{
date: "2017-07-26",
data: [{
"foodId": "59031fdcd78c55b7ffda17fc",
"qty": 1,
"dateTime": "2017-07-26T12:03:06.000Z",
"_id": "591c3bfcca93e86c3450a537"
},{
"foodId": "59031fdcd78c55b7ffda17fc",
"qty": 1,
"dateTime": "2017-07-26T12:03:010.000Z",
"_id": "591c3bfcca93e86c3450a537"
}]
}, {
date: "2017-05-18",
data: [{
"foodId": "59031fdcd78c55b7ffda17fc",
"qty": 1,
"dateTime": "2017-05-18T04:21:13.000Z",
"_id": "591d213b6878badb0621b840"
},{
"foodId": "59031fdcd78c55b7ffda17fc",
"qty": 1,
"dateTime": "2017-05-18T04:22:01.000Z",
"_id": "591d216a6878badb0621b842"
}]
}];
我正在使用nodejs,此刻,有点破折号. 请帮助我.
I am using nodejs, moment, lo-dash. Please help me out of this.
推荐答案
解决这些问题的常用方法是 地图 :
The usual solution to these questions is to group and map:
// Helper function to extract the date from a dateTime
var date = function(d){
return moment(d.dateTime).format('YYYY-MM-DD');
}
// map a group to the required form
var groupToSummary = function(group, date) {
return {
date: date,
data: group
}
}
var IWANT = _(IHAVE)
.groupBy(date)
.map(groupToSummary)
.value();
这篇关于如何按日期对对象进行分组?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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