嵌套对象数组上的 Lodash orderBy

Question

有一个包含一些嵌套属性的对象数组：

const sports = [{
  name: "Basketball",
  leagues: [{
     createdAt: 1
  }, {
     createdAt: 2
  }]
},{
  name: "Soccer",
  leagues: [{
     createdAt: 3
  }, {
     createdAt: 4
  }]
}]

要获取按名称 DESC (Z->A) 排序的对象数组（非嵌套属性），我这样做：

const sorted = _.orderBy(sports, item => item.name, ['desc']);

结果是

[{ name: "Soccer", ... },{ name: "Basketball", ... }]

我想要实现的是根据对象的嵌套数组对该对象进行排序 leagues.createdAt DESC（假设 1,2,3,4 是正确的时间戳）：

[{
  name: "Soccer",
  leagues: [{
     createdAt: 4
  }, {
     createdAt: 3
  }]
},{
  name: "Basketball",
  leagues: [{
     createdAt: 2
  }, {
     createdAt: 1
  }]
}]

试过那样做:

const sorted = _.orderBy(sports, [(item) => item.leagues[0].createdAt], ["desc"])

但是顺序不太对：

Answer 1

您需要映射有序数组，并使用 _.orderBy() 对 leagues 进行排序。我正在使用 _.flow() 创建一个函数，该函数首先对整个数组进行排序，然后映射并排序每个对象中的 leagues。

const { flow, orderBy, map } = _

const fn = flow(
  arr => orderBy(arr, 'name', 'desc'),
  arr => map(arr,  ({ leagues, ...o }) => ({
    ...o,
    leagues: orderBy(leagues, 'createdAt', 'desc')
  }))
)

const sports = [{"name":"Basketball","leagues":[{"createdAt":1},{"createdAt":2}]},{"name":"Soccer","leagues":[{"createdAt":3},{"createdAt":4}]}]

const result = fn(sports)

console.log(result)

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嵌套对象数组上的 Lodash orderBy

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lodash