Merge two arrays of objects in Ramda.js based on their shared ID property

Question

Merge two arrays of objects in Ramda.js based on their shared ID property

I'm working with two arrays of objects:

todos: [
    {
      id: 1,
      name: 'customerReport',
      label: 'Report sent to customer'
    },
    {
      id: 2,
      name: 'handover',
      label: 'Handover (in CRM)'
    },
  ]

And:

todosMoreDetails: [
          {
            id: 1,
            checked: false,
            link: {
              type: 'url',
              content: 'http://something.com'
            },
            notes: []
          },
          {
            id: 2,
            checked: false,
            link: {
              type: 'url',
              content: 'http://something.com'
            },
            notes: []
          }
        ]

My goal is to merge the two arrays based on the object ID, resulting in a final array like this:

FinalTodos: [
          {
            id: 1,
            checked: false,
            link: {
              type: 'url',
              content: 'http://something.com'
            },
            notes: [],
            name: 'customerReport',
            label: 'Report sent to customer'
          },
          {
            id: 2,
            checked: false,
            link: {
              type: 'url',
              content: 'http://something.com'
            },
            notes: [],
            name: 'handover',
            label: 'Handover (in CRM)'
          }
        ]

I've been attempting to achieve this using methods like merge, mergeAll, and mergeWithKey, but it seems like I'm missing something.

javascript ramda.js

Answer 1

Answer №1

To accomplish this task, utilize an intermediate groupBy approach:

Convert the todosMoreDetails array into an object categorized by the todo property ID using groupBy:

var moreDetailsById = R.groupBy(R.prop('id'), todosMoreDetails);

The moreDetailsById object contains keys representing IDs and values as arrays of todos. If the ID is unique, it will be a singleton array as follows:

{
      1: [{
        id: 1,
        checked: false,
        link: {
          type: 'url',
          content: 'http://something.com'
        },
        notes: []
      }]
}

Now merge each todo with its corresponding details fetched from the grouped view in the todos array:

var finalTodos = R.map(todo => R.merge(todo, moreDetailsById[todo.id][0]), todos);

An alternative, more detailed method:

function mergeTodo(todo) {
   var details = moreDetailsById[todo.id][0]; // this is not null safe
   var finalTodo = R.merge(todo, details);
   return finalTodo;
}

var moreDetailsById = R.groupBy(R.prop('id'), todosMoreDetails);
var finalTodos = todos.map(mergeTodo);

Answer 2

To accomplish this task, utilize an intermediate groupBy approach:

Convert the todosMoreDetails array into an object categorized by the todo property ID using groupBy:

var moreDetailsById = R.groupBy(R.prop('id'), todosMoreDetails);

The moreDetailsById object contains keys representing IDs and values as arrays of todos. If the ID is unique, it will be a singleton array as follows:

{
      1: [{
        id: 1,
        checked: false,
        link: {
          type: 'url',
          content: 'http://something.com'
        },
        notes: []
      }]
}

Now merge each todo with its corresponding details fetched from the grouped view in the todos array:

var finalTodos = R.map(todo => R.merge(todo, moreDetailsById[todo.id][0]), todos);

An alternative, more detailed method:

function mergeTodo(todo) {
   var details = moreDetailsById[todo.id][0]; // this is not null safe
   var finalTodo = R.merge(todo, details);
   return finalTodo;
}

var moreDetailsById = R.groupBy(R.prop('id'), todosMoreDetails);
var finalTodos = todos.map(mergeTodo);

Answer 3

Answer №2

It seems like the merge function is primarily used for arrays. Consider looking into the "extend" object method as an alternative. Perhaps consolidating the todo details into a single object could be a more efficient solution.

If you're using jQuery, check out: https://api.jquery.com/jquery.extend/
For underscore users: http://underscorejs.org/#extend
Or opt for a native JavaScript approach:

Example using underscore:

var result = [];
var entry = {};
_.each(todos, function(todo) {
    _.each(todosMoreDetails, function(detail) {
        if (todo.id == detail.id) {
            entry = _.extend(todo, detail);
            result.push(entry);
        }
    }
});
return result;

Answer 4

It seems like the merge function is primarily used for arrays. Consider looking into the "extend" object method as an alternative. Perhaps consolidating the todo details into a single object could be a more efficient solution.

If you're using jQuery, check out: https://api.jquery.com/jquery.extend/
For underscore users: http://underscorejs.org/#extend
Or opt for a native JavaScript approach:

Example using underscore:

var result = [];
var entry = {};
_.each(todos, function(todo) {
    _.each(todosMoreDetails, function(detail) {
        if (todo.id == detail.id) {
            entry = _.extend(todo, detail);
            result.push(entry);
        }
    }
});
return result;

Merge two arrays of objects in Ramda.js based on their shared ID property

Answer №1

Answer №2

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