lodash:Filtering Array of objects by another JSON Object

Question

I am trying to filter an array of objects using lodash by another JSON Object.

var users = [
  { 'user': 'barney', 'name': "donald", 'active': true },
  { 'user': 'joe', 'name': "john", 'active': false },
  { 'user': 'fred', 'name': "peri", 'active': false },
  { 'user': 'fred', 'name': "aru", 'active': false },
  { 'user': 'fred', 'name': "teena", 'active': false },
  { 'user': 'fred', 'name': "nill", 'active': false },
  { 'user': 'fred', 'name': "duck", 'active': false },
  { 'user': 'barney', 'name': "resaj", 'active': false },
  { 'user': 'pebbles', 'name': "jee",  'active': true }
];

another json Object :

var searchParams = { 'user': 'ba', 'name': "don"}

If First array object's user contains second object's user and 1st objects name contains 2nd objects name than i want the object.I tried this code but it returns with OR condition not AND Condition.

_.filter(users, function(o) {
                    var checkFlag = false;
                    _.forOwn(searchParams, function(v,k) {
                        if(_.includes(o[k],v)){
                            checkFlag = true;
                            return false;
                        }
                    });
                    return checkFlag;
                });

This returns below results

[{ 'user': 'barney', 'name': "donald", 'active': true },{ 'user': 'barney', 'name': "resaj", 'active': false }]

I want only first object { 'user': 'barney', 'name': "donald", 'active': true } Any help would be appreciated.Any idea

julian soro · Accepted Answer · 2017-06-10 06:48:33Z

2

Your issue is that in the iteratee function for your _.forOwn, if just the one of the user or name fields produces a match, then the whole user object is considered a match.

To produce your expected result, you can implement a map reduce. Replace your code with the following (this snippet uses lodash):

_.filter(users, function(o) {
    return _.map(searchParams, function(v,k) {
      return _.includes(o[k],v)
    }).reduce(function(isMatch, keyValueMatch){
      return isMatch && keyValueMatch
    }, true);
});

In this case, the _.map will check each user and provide an array or booleans telling you whether a key-value pair in searchParams is a match. The reduce portion will aggregate the array of booleans into a single true or false. To result in true, all the key-value pairs in searchParams must produce a true value. Otherwise, the reduce portion will return false for that user, meaning they get filtered out.

edited Jun 10, 2017 at 6:48

answered Jun 10, 2017 at 6:31

julian soro

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1 Comment

Mahen Over a year ago

Thanks @julian soro, works like charm,tried with more than two search params too. :)

Ori Drori · Accepted Answer · 2017-06-10 06:47:10Z

Use _.every() to iterate searchParams, so if any check fails, the item is filtered out:

var users = [
  { 'user': 'barney', 'name': "donald", 'active': true },
  { 'user': 'joe', 'name': "john", 'active': false },
  { 'user': 'fred', 'name': "peri", 'active': false },
  { 'user': 'fred', 'name': "aru", 'active': false },
  { 'user': 'fred', 'name': "teena", 'active': false },
  { 'user': 'fred', 'name': "nill", 'active': false },
  { 'user': 'fred', 'name': "duck", 'active': false },
  { 'user': 'barney', 'name': "resaj", 'active': false },
  { 'user': 'pebbles', 'name': "jee",  'active': true }
];

var searchParams = { 'user': 'ba', 'name': "don"};

var result = _.filter(users, function(o) {
  return _.every(searchParams, function(v, k) {
    return _.includes(o[k], v);
  });
});

console.log(result);

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

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