javascript - 更新对象值 Ramda

Question

在上一个问题中，我尝试按父 ID 对数组进行分组，然后将它们从每个对象中删除 - Group arrays by parent ids object Ramda .

但是现在我有一个新问题。例如，我想更新 id 为 12 的对象中的标题。

我的数据模型:

const stuff = {
  "31": [
    {
      "id": "11",
      "title": "ramda heeeelp"
    },
    {
      "id": "12",
      "title": "ramda 123"
    }
  ],
  "33": [
    {
      "id": "3",
      "title": "..."
    }
  ],
  "4321": [
    {
      "id": "1",
      "title": "hello world"
    }
  ]
}

尝试:

const alter = (id, key, value) => pipe(
  values,
  flatten,
  update(...) // <= end of my attempts
  // then group again
)

alter('12', 'title', 'new heading 123')(stuff)

Answer 1

您可以使用 lenses这里:

1. 结束:https://ramdajs.com/docs/#over
2. 集合:https://ramdajs.com/docs/#set

const titleLens = R.curry((key, id, data) => R.lensPath([
  key, 
  R.findIndex(R.whereEq({ id }), R.propOr([], key, data)), 
  'title'
]));

// ----
const stuff = {
  "31": [
    {
      "id": "11",
      "title": "ramda heeeelp"
    },
    {
      "id": "12",
      "title": "ramda 123"
    }
  ],
  "33": [
    {
      "id": "3",
      "title": "..."
    }
  ],
  "4321": [
    {
      "id": "1",
      "title": "hello world"
    }
  ]
}

const title3111 = titleLens('31', '11', stuff);
const result = R.set(title3111, 'DID RAMDA HELP YOU?', stuff);

console.log('result', result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.js" integrity="sha256-xB25ljGZ7K2VXnq087unEnoVhvTosWWtqXB4tAtZmHU=" crossorigin="anonymous"></script>