将键的值提升到顶层，同时使用Ramda保留其余对象

Question

我想将其内置到我的compose函数中，以使record的值到达对象的顶层，而其余键保持原样：

{
  record: {
    seasons: [
      1
    ],
    colors: [
      2
    ]
  },
  tag_ids: [
    2091
  ]
}

我追求的结果：

{
  seasons: [
    1
  ],
  colors: [
    2
  ],
  tag_ids: [
    2091
  ]
}

任何键可能或可能不存在。

我一直用compose函数中的ramda方式来挠头。目前，我正在查看toPairs，并做了一些相当长的变换，没有运气。

Answer 1

您可以将R.chain与R.merge和R.prop结合使用，通过将其与原始对象合并来拼合密钥的内容，然后可以省略原始密钥。

const { pipe, chain, merge, prop, omit } = R

const fn = key => pipe(
  chain(merge, prop(key)), // flatten the key's content
  omit([key]) // remove the key
)

const data = { record: { seasons: [1], colors: [2] }, tag_ids: [2091] }

const result = fn('record')(data)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.27.0/ramda.js"></script>

Answer 2

您可以使用点差运算符。

const startingWithAllProps = {
  record: {
    seasons: [
      1
    ],
    colors: [
      2
    ]
  },
  tag_ids: [
    2091
  ]
}

const startingWithoutRecord = {
  tag_ids: [
    2091
  ]
}

const startingWithoutTagIds = {
  record: {
    seasons: [
      1
    ],
    colors: [
      2
    ]
  }
}

const moveRecordUpOneLevel = (startingObject) => {
  const temp = {
    ...startingObject.record,
    tag_ids: startingObject.tag_ids
  }
  return JSON.parse(JSON.stringify(temp)) // To remove any undefined props
}

const afterTransformWithAllProps = moveRecordUpOneLevel(startingWithAllProps)
const afterTransformWithoutRecord = moveRecordUpOneLevel(startingWithoutRecord)
const afterTransformWithoutTagIds = moveRecordUpOneLevel(startingWithoutTagIds)

console.log('afterTransformWithAllProps', afterTransformWithAllProps)
console.log('afterTransformWithoutRecord', afterTransformWithoutRecord)
console.log('afterTransformWithoutTagIds', afterTransformWithoutTagIds)

Answer 3

在纯JS而不是Ramda中，这可能更简单：

const data = { record: { seasons: [1], colors: [2] }, tag_ids: [2091] }

const flattenRecord = ({record = {}, ...rest}) => ({...record, ...rest})

flattenRecord(data) //=> {"colors": [2], "seasons": [1], "tag_ids": [2091]}

如果您仍然想使用Ramda作为解决方案，请考虑研究R.mergeLeft（或R.mergeLeft）和R.mergeRight。

Answer 4

这可能也有帮助！

R.omit

R.omit