遍历对象数组与另一个对象数组

时间：2020-03-10 13:27:56

标签： javascript arrays json angular typescript

问题：

我有一个对象数组，我们每月可以像这样获得员工的工作时间：

{
    "allocationId": 227,
    "role": "Software Engineer",
    "name": "Test User",
    "country": "USA",
    "state": "TX",
    "city": "",
    "allocStartDate": "2019-03-09",
    "allocEndDate": "2020-03-10",
    "allocationHours": [{
            "allocationHoursId": 2250,
            "allocationId": 227,
            "monthYear": "February",
            "year": 2020,
            "workHours": 60,
            "lockStatus": "Y",
            "comments": null
        },
        {
            "allocationHoursId": 2251,
            "allocationId": 227,
            "monthYear": "January",
            "year": 2020,
            "workHours": 10,
            "lockStatus": "N",
            "comments": null
        },
        {
            "allocationHoursId": 2254,
            "allocationId": 227,
            "monthYear": "April",
            "year": 2020,
            "workHours": 40,
            "lockStatus": "N",
            "comments": null
        }
    ],
    "totalHours": 170
}

我需要针对一年中的月份格式化“ allocationHours”，以便对于存在数据的月份，将其分配给month，否则我们针对月份添加空值。请看图片以了解清晰度：

enter image description here

使该月的工作时间不为0。

我尝试过的：

const scrollableTableAttribute = [
  { key: 'January', value: '01' },
  { key: 'February', value: '02' },
  { key: 'March', value: '03' },
  { key: 'April', value: '04' },
  { key: 'May', value: '05' },
  { key: 'June', value: '06' },
  { key: 'July', value: '07' },
  { key: 'August', value: '08' },
  { key: 'September', value: '09' },
  { key: 'October', value: '10' },
  { key: 'November', value: '11' },
  { key: 'December', value: '12' }
];

And in the method -

      item.allocationHours.forEach((element) => {
        scrollableTableAttribute.map((month) => {
          if (element.monthYear === month.key) {
              test[month.key]  = element;
          } else {
            test[month.key]  = {
              workHours: 0, allocationId: item.allocationId,
              // tslint:disable-next-line: no-null-keyword
              monthYear: month.key, lockStatus: 'N', comment: '', allocationHoursId: null, year: null
            };
          }
        });
      });

这没有给我所需的结果，我们将不胜感激。谢谢！

3 个答案:

答案 0 :(得分：1)

因此，给定条件，每个月条目在值对象中是不同的，最好循环抛出您的months数组。 尝试这个： 

const YOUR_OBJECT = {
    "allocationId": 227,
    "role": "Software Engineer",
    "name": "Test User",
    "country": "USA",
    "state": "TX",
    "city": "",
    "allocStartDate": "2019-03-09",
    "allocEndDate": "2020-03-10",
    "allocationHours": [{
            "allocationHoursId": 2250,
            "allocationId": 227,
            "monthYear": "February",
            "year": 2020,
            "workHours": 60,
            "lockStatus": "Y",
            "comments": null
        },
        {
            "allocationHoursId": 2251,
            "allocationId": 227,
            "monthYear": "January",
            "year": 2020,
            "workHours": 10,
            "lockStatus": "N",
            "comments": null
        },
        {
            "allocationHoursId": 2254,
            "allocationId": 227,
            "monthYear": "April",
            "year": 2020,
            "workHours": 40,
            "lockStatus": "N",
            "comments": null
        }
    ],
    "totalHours": 170
};

const scrollableTableAttribute = [
  { key: 'January', value: '01' },
  { key: 'February', value: '02' },
  { key: 'March', value: '03' },
  { key: 'April', value: '04' },
  { key: 'May', value: '05' },
  { key: 'June', value: '06' },
  { key: 'July', value: '07' },
  { key: 'August', value: '08' },
  { key: 'September', value: '09' },
  { key: 'October', value: '10' },
  { key: 'November', value: '11' },
  { key: 'December', value: '12' }
];

const test = {};
scrollableTableAttribute.forEach( (month) => {
test[month.key] = YOUR_OBJECT.allocationHours.find((item) => month.key === item.monthYear) || {
            workHours: 0, allocationId: YOUR_OBJECT.allocationId,
            monthYear: month.key, lockStatus: 'N', comment: '', allocationHoursId: null, 
            year: null
  };
});
console.log(test)

如果这对您有用，那么您可以根据自己的需要做得更好。

答案 1 :(得分：1)

我们可以使用map方法来预测收到的所有月份到月份：

const months = new Map(json.allocationHours.map(s => [s.monthYear, s]));
let fallbackObject = {
    "allocationHoursId": null,
    "allocationId": null,
    "monthYear": null,
    "year": 2020,
    "workHours": 40,
    "lockStatus": "N",
    "comments": null
}

json.allocationHours = scrollableTableAttribute.map(({key}) => 
    ({...months.get(key) || fallbackObject}));

一个例子：

let json = {
    "allocationId": 227,
    "role": "Software Engineer",
    "name": "Test User",
    "country": "USA",
    "state": "TX",
    "city": "",
    "allocStartDate": "2019-03-09",
    "allocEndDate": "2020-03-10",
    "allocationHours": [{
            "allocationHoursId": 2250,
            "allocationId": 227,
            "monthYear": "February",
            "year": 2020,
            "workHours": 60,
            "lockStatus": "Y",
            "comments": null
        },
        {
            "allocationHoursId": 2251,
            "allocationId": 227,
            "monthYear": "January",
            "year": 2020,
            "workHours": 10,
            "lockStatus": "N",
            "comments": null
        },
        {
            "allocationHoursId": 2254,
            "allocationId": 227,
            "monthYear": "April",
            "year": 2020,
            "workHours": 40,
            "lockStatus": "N",
            "comments": null
        }
    ],
    "totalHours": 170
}

const scrollableTableAttribute = [
    { key: 'January', value: '01' },
    { key: 'February', value: '02' },
    { key: 'March', value: '03' },
    { key: 'April', value: '04' },
    { key: 'May', value: '05' },
    { key: 'June', value: '06' },
    { key: 'July', value: '07' },
    { key: 'August', value: '08' },
    { key: 'September', value: '09' },
    { key: 'October', value: '10' },
    { key: 'November', value: '11' },
    { key: 'December', value: '12' }
  ];

const months = new Map(json.allocationHours.map(s => [s.monthYear, s]));

let fallbackObject = {
    "allocationHoursId": null,
    "allocationId": null,
    "monthYear": null,
    "year": 2020,
    "workHours": 40,
    "lockStatus": "N",
    "comments": null
}

json.allocationHours = scrollableTableAttribute.map(({key}) => ({...months.get(key) || fallbackObject}));
console.log(json);

答案 2 :(得分：1)

由于您的item具有开始日期和结束日期，因此您实际上可以生成跨越该时间段的所有月份，并考虑到这可能跨越一个或多个年限，并且可能在该范围内的任何地方开始/结束一年。

您可以将年/月组合转换为一个数字，代表一个绝对的月数。

这是看起来如何：

const item = {"allocationId": 227,"role": "Software Engineer","name": "Test User","country": "USA","state": "TX","city": "","allocStartDate": "2019-03-09","allocEndDate": "2020-03-10","allocationHours": [{"allocationHoursId": 2250,"allocationId": 227,"monthYear": "February","year": 2020,"workHours": 60,"lockStatus": "Y","comments": null},{"allocationHoursId": 2251,"allocationId": 227,"monthYear": "January","year": 2020,"workHours": 10,"lockStatus": "N","comments": null},{"allocationHoursId": 2254,"allocationId": 227,"monthYear": "April","year": 2020,"workHours": 40,"lockStatus": "N","comments": null}],"totalHours": 170};

const months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];

const toMonths = (dateStr) => dateStr.slice(0, 4) * 12 + +dateStr.slice(5, 7) - 1;

const startMonth = toMonths(item.allocStartDate);

const result = Array.from({length: toMonths(item.allocEndDate) + 1 - startMonth}, (_, i) => ({ 
    allocationHoursId: null,
    allocationId: item.allocationId,
    monthYear: months[(startMonth + i) % 12], 
    year: Math.floor((startMonth + i) / 12),
    workHours: 0, lockStatus: "N", comments: ""
}));

for (const obj of item.allocationHours) {
    result[obj.year * 12 + months.indexOf(obj.monthYear) - startMonth] = obj;
}

console.log(result);

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