How can I return nested array with lodash?

Question

I have some json and would like to return some nested objects, this is the json:

{
  "existingPackage": {
    "primaryBundle": {
      "id": "2031",
      "serviceId": "114297251",
      "name": "TV - Entertainment, Drama, Movies",
      "products": [
        {
          "name": "Entertainment",
          "id": "100",
          "price": 2600,
          "gifted": false
        },
        {
          "name": "Drama",
          "id": "104",
          "price": 2000,
          "gifted": false,
          "swappableProducts": [
            {
              "name": "Sport",
              "id": "107",
              "price": 2500,
              "gifted": false
            }
          ]
        },
        {
          "name": "Movies",
          "id": "105",
          "price": 2000,
          "gifted": false,
          "swappableProducts": [
            {
              "name": "Sport",
              "id": "107",
              "price": 2500,
              "gifted": false
            }
          ]
        }
      ]
    }
  }
}

The goal is to return only items from the productsarray which have the swappableProducts property and have a certain id. So for example when I an productId = 105 then I would like to return:

{
          "name": "Movies",
          "id": "105",
          "price": 2000,
          "gifted": false,
          "swappableProducts": [
            {
              "name": "Sport",
              "id": "107",
              "price": 2500,
              "gifted": false
            }
          ]
        }
}

How can I return this with lodash?

Possible duplicate of [How to use lodash to find and return an object from Array?](http://stackoverflow.com/questions/31054021/how-to-use-lodash-to-find-and-return-an-object-from-array) — Rajesh, Mar 06 '17 at 08:11

score 1 · Accepted Answer · answered Mar 06 '17 at 14:46

Here's my approach:

_.filter(
  products,
  i => _.every([
    _.has(i, 'swappableProducts'),
    _.eq(_.result(i, 'id'), '105')
  ])
);

The idea is to pass both predicates to every(). The first uses has() to check if the swappableProducts property exists. The second predicate combines eq() and result() to check the id value.

score 0 · Answer 2 · answered Mar 06 '17 at 08:12

0

You could do something like this

_.filter(data.existingPackage.primaryBundle.products, 
        function(o) { 
            return o.swappableProducts !== undefined && o.id==="105"; 
        });

answered Mar 06 '17 at 08:12

remborg

528
3
14

Jonathan Portorreal · Answer 3 · 2017-03-06T09:24:20.187

Here's a function that returns desired result

const getProducts = obj => obj.existingPackage.primaryBundle.products;

const withSwappable = _.curry((myId, obj) => _.result(obj, 'swappableProducts[0].id', false) == myId)

function getProductsWithId(data, myId) {
  return _.filter(getProducts(data), withSwappable(myId))
}

const data = {
  "existingPackage": {
    "primaryBundle": {
      "id": "2031",
      "serviceId": "114297251",
      "name": "TV - Entertainment, Drama, Movies",
      "products": [{
          "name": "Entertainment",
          "id": "100",
          "price": 2600,
          "gifted": false
        },
        {
          "name": "Drama",
          "id": "104",
          "price": 2000,
          "gifted": false,
          "swappableProducts": [{
            "name": "Sport",
            "id": "107",
            "price": 2500,
            "gifted": false
          }]
        },
        {
          "name": "Movies",
          "id": "105",
          "price": 2000,
          "gifted": false,
          "swappableProducts": [{
            "name": "Sport",
            "id": "107",
            "price": 2500,
            "gifted": false
          }]
        }
      ]
    }
  }
}


console.log(getProductsWithId(data, "107"));
console.log(getProductsWithId(data, "100"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.js"></script>

How can I return nested array with lodash?

3 Answers3