如何使用 lodash _groupBy

Question

这就是我的 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。我就是这样做的：

console.log(_.groupBy(invoices.data.invoiceFees, 'quarter.q_name'));

这会将所有内容切成这样的空结果：

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，以下会产生您所追求的结果：

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')
            ])
        )}
    ))
}