How to get values from object property array with lodash?

Question

I have the following obj:

 { Id: '11ea9563-1a4c-c21b-904f-00ff98e8d5ab',
  Email: 'Email',
  Password:
   { type: 'Buffer',
     data:
      [ Buffer value] },
  roles: [ { Name: 'Developer', userroles: [Object] } ],
  Events:
   [ { Id: '11ea9556-c025-39ae-904f-00ff98e8d5ab'} ] }

I want to get the Id, roles.Name and Events.Id with lodash:

_.pick(obj, ['Id', 'roles.Name', 'Events.Id']),

But with the above I only manage to get the Id.

How can I accomplish this with lodash?

Maybe the answer at stackoverflow.com/questions/50096091/… can help you out. — Marco
– Marco, Commented May 13, 2020 at 23:02
@marco-a Thanks for the link but the accepted answer there is working with an array of objects. In my case it is one object but has two array properties. Any ideas? — CodingLittle
– CodingLittle, Commented May 13, 2020 at 23:07
If you scroll down a little there's a function deepPick in the answer, maybe this function works out for you? — Marco
– Marco, Commented May 13, 2020 at 23:07

CodingLittle · Accepted Answer · 2020-05-14 00:20:43Z

2

const answer = {
   id: obj.Id,
   roles: _.map(obj.roles, 'Name'),
   events: _.map(obj.Events, 'Id')
};

const obj = { 
  Id: '11ea9563-1a4c-c21b-904f-00ff98e8d5ab',
  Email: 'Email',
  Password: {
    type: 'Buffer'
  },
  roles: [ { Name: 'Developer', userroles: [Object] } ],
  Events:
   [ { Id: '11ea9556-c025-39ae-904f-00ff98e8d5ab'} ]
}

answer = {
   id: obj.Id,
   roles: _.map(obj.roles, 'Name'),
   events: _.map(obj.Events, 'Id')
};


console.log(answer);

<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

edited May 14, 2020 at 0:20

CodingLittle

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answered May 13, 2020 at 23:39

user125661

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2 Comments

CodingLittle Over a year ago

Thanks for the answer BUT i only want the Name for roles, in this canse Im getting: roles: { '0': { Name: 'Developer', userroles: [Object] } I dont want the userroles prop to be there

CodingLittle Over a year ago

Thanks m8. I added my own below but liked yours alot more since roles becomes [Developer, Admin, etc] but in my solution: [{Name:"Developer"}, {Name:"Admin"}, {Name:"Etc"}]

Marvin Kang' · Accepted Answer · 2020-05-14 00:10:44Z

2

From what I have read here, You can't use _.pick for deep picking. Use a combination of _.get and _.map

var _ = require("lodash")

const data = {
  Id: '11ea9563-1a4c-c21b-904f-00ff98e8d5ab',
  Email: 'Email',
  Password: { type: 'Buffer' },
  roles: [
    { Name: 'Developer', userroles: [Object] }
  ],
  Events: [ { Id: '11ea9556-c025-39ae-904f-00ff98e8d5ab' } ]
}

var result = {
  Id: data.Id,
  Email: data.Email,
  'roles.Name': _.map(data.roles, 'Name'), /* Returns expected array of object values */
  'roles.Name': _.map(data.roles, o => _.pick(o, ['Name'])), /* Returns expected array of object */
  'Events.Id': _.map(data.Events, 'Id'),
};


console.log(result)

edited May 14, 2020 at 0:10

answered May 14, 2020 at 0:02

Marvin Kang'

1981 silver badge6 bronze badges

2 Comments

user125661 Over a year ago

_.get isn't necessary here. Just use data.roles instead of _.get(data, 'roles')

CodingLittle Over a year ago

This gives perspective on other way to do it. A bit more bloated than @user125661 answer but never the less I learned from this, vote up!

CodingLittle · Accepted Answer · 2020-05-14 00:01:13Z

1

Not sure if this is the best answer for this but right now Ive done the following:

Thanks to @marco-a

I analyzed this answer and came up with the following:

const deepPick = (paths, obj) => _.fromPairs(paths.map(p => [_.last(p.split('.')), _.get(obj, p)]));

My own solution so far:

  const data = _.pick(obj, ['Id', 'roles', 'events']);

  const userRoles = data.roles.map(role=> deepPick(['Name'], role));

  const eventIds = data.events.map(eventId=> deepPick(['Id'], eventId));

The output becomes:

{
    "id": "11ea9563-1a4c-c21b-904f-00ff98e8d5ab",
    "roles": [
      {
        "Name": "Developer"
      },
      {
        "Name": "Admin"
      }
    ],
    "events": [
      {
        "Id": "11ea9556-c025-39ae-904f-00ff98e8d5ab"
      }
    ]
  },
}

edited May 14, 2020 at 0:01

answered May 13, 2020 at 23:56

CodingLittle

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