如何使用 lodash javascript 对对象中的数组数据进行分组

Question

我想使用 lodash javscript 对数据进行分组。 首先我尝试使用 groupBy machine_id 然后我总结总价值

这是我的数据

const data = [
  {
    id: 1,
    machine_id: 1,
    work_id: 1,
    total: 10
  },
  {
    id: 2,
    machine_id: 1,
    work_id: 2,
    total: 15
  },
  {
    id: 3,
    machine_id: 2,
    work_id: 3,
    total: 10
  },
  {
    id: 4,
    machine_id: 1,
    work_id: 1,
    total: 15
  },
]

我想对 machine_id 进行分组，然后我想通过 machine_id 求和，然后我想对每个 work_id 求和

我想这样输出

[
  {
      "machine_id": 1,
      "sum_total": 25
      "work_group": [
        // In this work group I want to sum total each work_id 
        {
          work_id: 1
          sum_total: 25
        },
          {
          work_id: 2
          sum_total: 15
        }
      ]
    },
    {
      "machine_id": 2,
      "sum_total": 10
      "work_group": [
        {
          work_id: 3
          sum_total: 10
        }
      ]
    },
]

这就是我尝试的

let groupData = _(data)
.groupBy("machine_id")
.map((data, machine_id) => ({
    machine_id,
    sum_total: _.sumBy(data, item => Number(item.total_time))
}))
.value();

我的输出是这样的：

[
  {
      "machine_id": 1,
      "sum_total": 25

    },
    {
      "machine_id": 2,
      "sum_total": 10

    },
]

如何通过 work_id 向下钻取总和

Answer 1

用户reduce和Object.values将简化

 const data = [ { id: 1, machine_id: 1, work_id: 1, total: 10 }, { id: 2, machine_id: 1, work_id: 2, total: 15 }, { id: 3, machine_id: 2, work_id: 3, total: 10 }, { id: 4, machine_id: 1, work_id: 1, total: 15 } ]; const updated = Object.values( data.reduce((acc, curr) => { if (curr.machine_id in acc) { const work_group = [ ...acc[curr.machine_id].work_group, { work_id: curr.work_id, sum_total: curr.total } ].reduce((wg_acc, wg_curr) => { wg_acc[wg_curr.work_id] = wg_curr.work_id in wg_acc ? { ...wg_acc[wg_curr.work_id], sum_total: wg_acc[wg_curr.work_id].sum_total + wg_curr.sum_total } : { ...wg_curr }; return wg_acc; }, {}); acc[curr.machine_id] = { ...acc[curr.machine_id], sum_total: acc[curr.machine_id].sum_total + curr.total, work_group: Object.values(work_group) }; } else { acc[curr.machine_id] = { machine_id: curr.machine_id, sum_total: curr.total, work_group: [{ work_id: curr.work_id, sum_total: curr.total }] }; } return acc; }, {}) ); console.log(updated);

Answer 2

您可以尝试以下方法

 const data = [ { id: 1, machine_id: 1, work_id: 1, total: 10 }, { id: 2, machine_id: 1, work_id: 2, total: 15 }, { id: 2, machine_id: 2, work_id: 3, total: 10 } ] const res = data.reduce((acc = [], obj) => { const data = acc.findIndex(d => d.machine_id === obj.machine_id) if(data > -1) { acc[data] = { ...data, sum_total: acc[data].sum_total + obj.total, work_group: [...acc[data].work_group, obj] } } else { acc.push({ machine_id: obj.machine_id, sum_total: obj.total, work_group:[obj] }) } return acc; }, []) console.log(res)