Retrieve a data value from a JSON object by checking if the ID exists within a nested object

Question

Retrieve a data value from a JSON object by checking if the ID exists within a nested object

I am facing the challenge of navigating through a JSON object where child objects contain IDs that need to be matched with parent properties. The JSON structure looks like this:

{
    id: 1,
    map: "test",
    parameter_definitions: [{ID: 1, parameterUnits: "%"},{ID: 2, parameterUnits: "%"}],
},
{
    id: 2,
        map: "test2",
    parameter_definitions: [{ID: 3, parameterUnits: "%"},{ID: 4, parameterUnits: "%"}],
}

My goal is to extract the 'map' value from the correct JSON object based on whether a given ID exists within the parameter_definitions array. This task seems challenging and I am struggling to find a solution.

javascript json

Answer 1

Answer №1

If you're looking for a way to retrieve map elements by ID, check out this function called "getMapElementById":

  let maps = [{
                 id: 1,
                 map: "test",
                 parameter_definitions: [{ID: 1, parameterUnits: "%"},{ID: 2, parameterUnits: "%"}],
                },
                {
                  id: 2,
                  map: "test2",
                  parameter_definitions: [{ID: 3, parameterUnits: "%"},{ID: 4, parameterUnits: "%"}],
                 }]


    function getMapElementById( maps, requiredId ) {

          for(let i=0;i<maps.length;i++){
              for(let j=0;j<maps[i].parameter_definitions.length;j++){
                  if( maps[i].parameter_definitions[j].ID == requiredId ) {
                     return maps[i];
                  }
              }
          }

    }

    let mapResult = getMapElementById(maps, 3);
    console.log(mapResult);

Answer 2

If you're looking for a way to retrieve map elements by ID, check out this function called "getMapElementById":

  let maps = [{
                 id: 1,
                 map: "test",
                 parameter_definitions: [{ID: 1, parameterUnits: "%"},{ID: 2, parameterUnits: "%"}],
                },
                {
                  id: 2,
                  map: "test2",
                  parameter_definitions: [{ID: 3, parameterUnits: "%"},{ID: 4, parameterUnits: "%"}],
                 }]


    function getMapElementById( maps, requiredId ) {

          for(let i=0;i<maps.length;i++){
              for(let j=0;j<maps[i].parameter_definitions.length;j++){
                  if( maps[i].parameter_definitions[j].ID == requiredId ) {
                     return maps[i];
                  }
              }
          }

    }

    let mapResult = getMapElementById(maps, 3);
    console.log(mapResult);

Answer 3

Answer №2

It's not definitively stated whether multiple parent objects are allowed to have children objects with the same ID, but you can handle this scenario by employing a combination of filter and find methods:

const objects = [
    {
        id: 1,
        map: "test",
        parameter_definitions: [{ ID: 1, parameterUnits: "%" }, { ID: 2, parameterUnits: "%" }],
    },
    {
        id: 2,
        map: "test2",
        parameter_definitions: [{ ID: 3, parameterUnits: "%" }, { ID: 4, parameterUnits: "%" }],
    }
];

const filteredObjects = objects.filter(object => object.parameter_definitions.find(param => param.ID === 2));
if (filteredObjects.length > 0) {
  // If it is guaranteed that only one parent object matches each child object ID, simply return the first item from the array
  console.log(filteredObjects[0].map);

  // If multiple parent objects can have the same child object ID, utilize the map function to access the map property of all parent objects
  console.log(filteredObjects.map(object => object.map));
}

Answer 4

It's not definitively stated whether multiple parent objects are allowed to have children objects with the same ID, but you can handle this scenario by employing a combination of filter and find methods:

const objects = [
    {
        id: 1,
        map: "test",
        parameter_definitions: [{ ID: 1, parameterUnits: "%" }, { ID: 2, parameterUnits: "%" }],
    },
    {
        id: 2,
        map: "test2",
        parameter_definitions: [{ ID: 3, parameterUnits: "%" }, { ID: 4, parameterUnits: "%" }],
    }
];

const filteredObjects = objects.filter(object => object.parameter_definitions.find(param => param.ID === 2));
if (filteredObjects.length > 0) {
  // If it is guaranteed that only one parent object matches each child object ID, simply return the first item from the array
  console.log(filteredObjects[0].map);

  // If multiple parent objects can have the same child object ID, utilize the map function to access the map property of all parent objects
  console.log(filteredObjects.map(object => object.map));
}

Answer 5

Answer №3

We apologize, but your question seems a bit unclear. Are you searching for this information?

// Sample code snippet

const myData = [{ id: 1, map: 'test', parameter_definitions: [{ ID: 1, parameterUnits: '%' }, { ID: 2, parameterUnits: '%' }] }, { id: 2, map: 'test2', parameter_definitions: [{ ID: 3, parameterUnits: '%' }, { ID: 4, parameterUnits: '%' }] }];

const getRootElement = (data, id) => objectScan(['[*].parameter_definitions[*].ID'], {
  abort: true,
  filterFn: ({ value, parents, context }) => {
    if (value === id) {
      context.push(...parents);
      return true;
    }
    return false;
  }
})(data, [])[2];

console.log(getRootElement(myData, 5));
// => undefined

console.log(getRootElement(myData, 3));
// => { id: 2, map: 'test2', parameter_definitions: [ { ID: 3, parameterUnits: '%' }, { ID: 4, parameterUnits: '%' } ] }

.as-console-wrapper {max-height: 100% !important; top: 0}

<script src="https://bundle.run/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e28d8088878196cf9181838ca2d3d1ccdaccd2">[email protected]</a>"></script>

Important Note: The individual who created object-scan is the author.

Answer 6

We apologize, but your question seems a bit unclear. Are you searching for this information?

// Sample code snippet

const myData = [{ id: 1, map: 'test', parameter_definitions: [{ ID: 1, parameterUnits: '%' }, { ID: 2, parameterUnits: '%' }] }, { id: 2, map: 'test2', parameter_definitions: [{ ID: 3, parameterUnits: '%' }, { ID: 4, parameterUnits: '%' }] }];

const getRootElement = (data, id) => objectScan(['[*].parameter_definitions[*].ID'], {
  abort: true,
  filterFn: ({ value, parents, context }) => {
    if (value === id) {
      context.push(...parents);
      return true;
    }
    return false;
  }
})(data, [])[2];

console.log(getRootElement(myData, 5));
// => undefined

console.log(getRootElement(myData, 3));
// => { id: 2, map: 'test2', parameter_definitions: [ { ID: 3, parameterUnits: '%' }, { ID: 4, parameterUnits: '%' } ] }

.as-console-wrapper {max-height: 100% !important; top: 0}

<script src="https://bundle.run/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e28d8088878196cf9181838ca2d3d1ccdaccd2">[email protected]</a>"></script>

Important Note: The individual who created object-scan is the author.

Retrieve a data value from a JSON object by checking if the ID exists within a nested object

Answer №1

Answer №2

Answer №3

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