如何使用 lodash _groupBy

Question

这是我的 json 的样子：invoices = {  "count": 1 "data": Array(0)[{    "company": "ABC PLC",    "customer": {      "name": "XYZ"    },    "invoiceFees": Array(2)[      0: {        "quarter": {          "q_name": "A",          "description": "payments for quarter A"        }      },      1: {        "quarter": {          "q_name": "B",          "description": "payments for quarter B"        }      }    ]  }]}我正在尝试按季度对发票结果进行分组。这就是我的做法：console.log(_.groupBy(invoices.data.invoiceFees, 'quarter.q_name'));这会将所有内容切成空结果，如下所示：invoices = {}我在这里做错了什么？我想要的输出应该是这样的：invoices = {"data": [{  "company": "ABC PLC",  "customer": {    "name": "XYZ"  },  "invoiceFees": [{      "quarter A:  {      "description": "payments for quarter A"    },    "quarter B:  {    "description": "payments for quarter B"  }}]}]}

Answer 1

好的，对于您的具体示例，以下内容会产生您想要的结果：

invoices = {

    data: _.map(invoices.data, d => _.assign(

        _.omit(d, 'invoiceFees'),

        _.fromPairs(

            _.map(d.invoiceFees, f => [

                'quarter ' + f.quarter.q_name,

                _.omit(f.quarter, 'q_name')

            ])

        )

    ))

}

如果你需要invoiceFees作为一个单独的对象，那么

invoices = {

    data: _.map(invoices.data, d => _.assign(

        d,

        {invoiceFees: _.fromPairs(

            _.map(d.invoiceFees, f => [

                'quarter ' + f.quarter.q_name,

                _.omit(f.quarter, 'q_name')

            ])

        )}

    ))

}