我有一个包含不同对象的数组,其中每个对象都是一个订单。
看起来像这样:

array = [
    {
    doc : {
      date: "2017-03-06T16:48:23.080Z",
      products:[
        {
          product: "Product 1",
          number: 3
        },
        {
          product: "Product 2",
          number: 2
        }
      ]
    }
  },
  {
    doc : {
      date: "2017-03-07T16:48:23.080Z",
      products:[
        {
          product: "Product 2",
          number: 10
        },
        {
          product: "Product 3",
          number: 1
        }
      ]
    }
  }
]


我希望能够获取这些数据并将其推入新的数组,每个数组都有一个date属性(按日期分组)和一个产品嵌套的数组,该数组将不同的订单分组(按产品分组)。像这样:

array = [
    {
       date: 'Date X',
       products: [
         {
          product: 'product 1',
          units: 3
         },
         {
          product: 'product 2',
          units: 2
         }
      ]
    },
    {
       date: 'Date Y',
       products: [
         {
          product: 'product 2',
          units: 10
         },
         {
          product: 'product 3',
          units: 1
         }

      ]
    }
]


您将如何处理?到目前为止,我已经尝试过与Lodash尝试重用一些旧代码,但运气不好。可以用forEach完成吗?

最佳答案

使用lodash和ES6的解决方案:

// Remove unnecesary .doc properties
let arrayWithoutDoc = _.map(array, el => el.doc);

// Group by dates to single object
let grouped = _.groupBy(arrayWithoutDoc, el => el.date);

// Convert object to requested format
let result = _.map(grouped, (value, date) => ({
    date: date,
    products: sumProductsUnits(
        _.flatMap(value, el => el.products)
    )
}));

// Function for grouping unique products with sum of units
function sumProductsUnits(products) {
    var productGroups = _.groupBy(products, productObj => productObj.product);

    return _.map(productGroups, (productGroup, productName) => ({
        product: productName,
        units: productGroup.reduce((sum, val) => sum + val.number, 0)
    }))
}


我假设在原始对象中units等于number

result包含:

[
   {
      "date":"2017-03-06T16:48:23.080Z",
      "products":[
         {
            "product":"Product 1",
            "units":3
         },
         {
            "product":"Product 2",
            "units":2
         }
      ]
   },
   {
      "date":"2017-03-07T16:48:23.080Z",
      "products":[
         {
            "product":"Product 2",
            "units":10
         },
         {
            "product":"Product 3",
            "units":1
         }
      ]
   }
]

关于javascript - 分组数组中的数据,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/42610343/

10-12 07:26
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