Lodash集团随着时间的推移

Question

我试图在今天，本周，本月和之前几个月对一组日期进行分组。然而，在我达到这一点之前，我正在努力按月进行基本的分组。

const data = [{
 campaign: "Charles",
 company_ID: "1",
 coreURL: "http://www.test77.com",
 createdAt: "2017-11-06T20:45:56.931Z",
 owner: "K7xTxu7PRDCuhFZRC",
 updatedAt: "2017-09-06T20:45:56.931Z",
 _id: "6gsb42PSSJt7PgsDG"
}, {
 campaign: "Charles",
 company_ID: "1",
 coreURL: "http://www.test66,com",
 createdAt: "2017-11-06T20:46:27.744Z",
 owner: "K7xTxu7PRDCuhFZRC",
 updatedAt: "2017-10-06T20:46:27.744Z",
 _id: "Md4wCnEsrQrWApnLS"
}, {
 campaign: "Gary",
 company_ID: "1",
 coreURL: "http://www.test55,com",
 createdAt: "2017-11-06T20:46:27.744Z",
 owner: "K7xTxu7PRDCuhFZRC",
 updatedAt: "2017-07-06T20:46:27.744Z",
 _id: "5p44uiwRgqp35YXRf"
}
];

const grouper = 'updatedAt';

let groupedData = _
  .chain(data)
  .groupBy(datum => moment(datum.grouper).format("MM")) 

编辑：然而，这似乎只是由＆＃34; 11＆＃34; （今天的月份）

任何帮助都会非常感激

Answer 1

datum.grouper为undefined，因此moment(datum.grouper)将返回当前日期。

您应该使用datum[grouper]或类似_.property('updatedAt')的内容。

关于如何将日期分为今天，本周，本月和其他月份的问题，请尝试以下操作：

const data = [{
  campaign: "Charles",
  company_ID: "1",
  coreURL: "http://www.test77.com",
  createdAt: "2017-11-06T20:45:56.931Z",
  owner: "K7xTxu7PRDCuhFZRC",
  updatedAt: "2017-09-06T20:45:56.931Z",
  _id: "6gsb42PSSJt7PgsDG"
}, {
  campaign: "Charles",
  company_ID: "1",
  coreURL: "http://www.test66,com",
  createdAt: "2017-11-06T20:46:27.744Z",
  owner: "K7xTxu7PRDCuhFZRC",
  updatedAt: "2017-10-06T20:46:27.744Z",
  _id: "Md4wCnEsrQrWApnLS"
}, {
  campaign: "Gary",
  company_ID: "1",
  coreURL: "http://www.test55,com",
  createdAt: "2017-11-06T20:46:27.744Z",
  owner: "K7xTxu7PRDCuhFZRC",
  updatedAt: "2017-07-06T20:46:27.744Z",
  _id: "5p44uiwRgqp35YXRf"
}, {
  campaign: "Fred",
  company_ID: "1",
  coreURL: "http://www.test55,com",
  createdAt: "2017-11-06T20:46:27.744Z",
  owner: "K7xTxu7PRDCuhFZRC",
  updatedAt: "2017-11-15T03:46:27.744Z",
  _id: "5p44uiwRgqp35YXRf"
}, {
  campaign: "Fred",
  company_ID: "1",
  coreURL: "http://www.test55,com",
  createdAt: "2017-11-06T20:46:27.744Z",
  owner: "K7xTxu7PRDCuhFZRC",
  updatedAt: "2017-11-03T20:46:27.744Z",
  _id: "5p44uiwRgqp35YXRf"
}, {
  campaign: "Fred",
  company_ID: "1",
  coreURL: "http://www.test55,com",
  createdAt: "2017-11-06T20:46:27.744Z",
  owner: "K7xTxu7PRDCuhFZRC",
  updatedAt: "2017-11-13T20:46:27.744Z",
  _id: "5p44uiwRgqp35YXRf"
}, {
  campaign: "Fred",
  company_ID: "1",
  coreURL: "http://www.test55,com",
  createdAt: "2017-11-06T20:46:27.744Z",
  owner: "K7xTxu7PRDCuhFZRC",
  updatedAt: "2017-11-09T20:46:27.744Z",
  _id: "5p44uiwRgqp35YXRf"
}];

const groupProp = _.property('updatedAt');

let determineGroup = value => {
  // remove '2017-11-15' to actually use current date 
  const now = moment('2017-11-15T10:00:03Z').startOf('day');

  if (value.isSame(now, 'day')) {
    return 'today';
  }
  if (value.isAfter(now.clone().subtract(7, 'days').startOf('day'))) {
    return 'this week';
  }
  if (value.isSame(now, 'month')) {
    return 'this month';
  }
  return value.format('MM');
};

let groupedData = _
  .chain(data)
  .groupBy(datum => determineGroup(moment(groupProp(datum))))
  .value()

console.log(groupedData);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.19.2/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Answer 2

如果您只需要当前的月，日，年，也许可以使用过滤器。

const today = _.filter(data, d => moment(d.updatedAt).isSame(moment(), 'day'));
console.log(today);

const thisWeek = _.filter(data, d => moment(d.updatedAt).isSame(moment(), 'week'));
console.log(thisWeek);

const thisMonth = _.filter(data, d => moment(d.updatedAt).isSame(moment(), 'month'));
console.log(thisMonth);

或者groupBy如果您需要所有月份（所有年份）

const byMonth = _.groupBy(data, d => moment(d.updatedAt).month());
console.log(byMonth);

https://jsbin.com/xidido/edit?js,console

Answer 3

let groupedData = _
.chain(data)
.groupBy(record => moment(record.updatedAt).format("MM"))
.value();