how to update a property in nested json array using ramdajs

Question

I have an array

[
  {
    "offerId": "123",
    "offerStatus": "ACTIVATED",
    "products": [
      {
        "productId": "1"
      }
    ]
  },
  {
    "offerId": "456",
    "offerStatus": "NOT_ACTIVATED",
    "products": [
      {
        "productId": "2"
      },
      {
        "productId": "3"
      }
    ]
  }
]

Want to push(copy) offerStatus into product object, so the expected output is

[
  {
    "offerId": "123",
    "offerStatus": "ACTIVATED",
    "products": [
      {
        "productId": "1",
        "offerStatus": "ACTIVATED"
      }
    ]
  },
  {
    "offerId": "456",
    "offerStatus": "NOT_ACTIVATED",
    "products": [
      {
        "productId": "2",
        "offerStatus": "NOT_ACTIVATED"
      },
      {
        "productId": "3",
        "offerStatus": "NOT_ACTIVATED"
      }
    ]
  }
]

Answer 1

Map the array, use the withSpec utility function (based on this answer) to update the products using the offerStatus of the parent. Then map products, and merge the current offerStatus:

const { pipe, applySpec, chain, mergeLeft, map, mergeRight } = R

const withSpec = pipe(applySpec, chain(mergeLeft)) // create new properties using a spec, and add to object

const fn = map(withSpec({
  products: ({ offerStatus, products }) => 
    map(mergeRight({ offerStatus }), products)
}))

const items = [{"offerId":"123","offerStatus":"ACTIVATED","products":[{"productId":"1"}]},{"offerId":"456","offerStatus":"NOT_ACTIVATED","products":[{"productId":"2"},{"productId":"3"}]}]

const result = fn(items)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.29.0/ramda.min.js" integrity="sha512-5x/n+aOg68Z+O/mq3LW2pC2CvEBSgLl5aLlOJa87AlYM1K8b8qsZ7NTHLe3Hu56aS2W0rgEgVCFA3RM12IXAGw==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>