Mongoose String to ObjectID

Question

i have string with ObjectId .

var comments = new Schema({
    user_id:  { type: Schema.Types.ObjectId, ref: 'users',required: [true,'No user id found']},
    post: { type: Schema.Types.ObjectId, ref: 'posts',required: [true,'No post id found']}....

export let commentsModel: mongoose.Model<any> = mongoose.model("comments", comments);

How i user it:

let comment = new commentsModel;
str = 'Here my ObjectId code' //
comment.user_id = str;
comment.post = str;
comment.save();

When I create a "comment" model and assign a string user_id value or post I have an error when saving. I make console.log(comment) all data is assigned to vars.

I try:

 var str = '578df3efb618f5141202a196';
    mongoose.mongo.BSONPure.ObjectID.fromHexString(str);//1
    mongoose.mongo.Schema.ObjectId(str);//2
    mongoose.Types.ObjectId(str);//3

TypeError: Object function ObjectID(id) {
TypeError: Cannot call method 'ObjectId' of undefined
TypeError: Cannot read property 'ObjectId' of undefined

And of course I included the mongoose BEFORE ALL CALLS

import * as mongoose from 'mongoose';

nothing works.

Possible duplicate of [Node.js Mongoose.js string to ObjectId function](http://stackoverflow.com/questions/6578178/node-js-mongoose-js-string-to-objectid-function) — DAXaholic, Jul 19 '16 at 04:27
Then start showing some code / error messages which should be included in your question right from the start. We cannot help you when you don't show what fails (your code) and how it fails (the error) — DAXaholic, Jul 19 '16 at 09:29

robertklep · Accepted Answer · 2016-07-19T17:02:01.380

42

You want to use the default export:

import mongoose from 'mongoose';

After that, mongoose.Types.ObjectId will work:

import mongoose from 'mongoose';
console.log( mongoose.Types.ObjectId('578df3efb618f5141202a196') );

EDIT: full example (tested with mongoose@4.5.5):

import mongoose from 'mongoose';

mongoose.connect('mongodb://localhost/test');

const Schema = mongoose.Schema;

var comments = new Schema({
    user_id:  { type: Schema.Types.ObjectId, ref: 'users',required: [true,'No user id found']},
    post: { type: Schema.Types.ObjectId, ref: 'posts',required: [true,'No post id found']}
});

const commentsModel = mongoose.model("comments", comments);

let comment = new commentsModel;
let str = '578df3efb618f5141202a196';
comment.user_id = str;
comment.post = str;
comment.save().then(() => console.log('saved'))
              .catch(e => console.log('Error', e));

Database shows this:

mb:test$ db.comments.find().pretty()
{
    "_id" : ObjectId("578e5cbd5b080fbfb7bed3d0"),
    "post" : ObjectId("578df3efb618f5141202a196"),
    "user_id" : ObjectId("578df3efb618f5141202a196"),
    "__v" : 0
}

edited Jul 19 '16 at 17:02

answered Jul 19 '16 at 10:31

robertklep

198,204
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when i create "comments" model and set value i have error. `comments.user_id = mongoose.Types.ObjectId('578df3efb618f5141202a196');` `message: 'Cast to ObjectId failed for value "" at path "user_id"', name: 'CastError', type: 'ObjectId', value: '', path: 'user_id'` Mongoose see empty field... (((( – Melixion Jul 19 '16 at 10:38
That's a different issue (although `comments` is a schema in your example code, yet you're using it as a document?). Can you show how you create a model from the schema, how you create the document, and how you are assigning the `user_id` to it (all by editing your question)? – robertklep Jul 19 '16 at 10:42
add some details to question – Melixion Jul 19 '16 at 11:10
@Melixion `comments` is a schema, so `new comments` should fail already. It doesn't look like the actual code that you're using. – robertklep Jul 19 '16 at 11:22
forgot some details ) you are right ) add to question – Melixion Jul 19 '16 at 16:56
@Melixion I added a fully working example (for me) using your code. – robertklep Jul 19 '16 at 17:02
How its possible ? ( `comment.user_id = str;` without `mongoose.Types.ObjectId` i have error ((( – Melixion Jul 19 '16 at 18:10
@Melixion which version of Mongoose are you using? `npm ls mongoose` should show you. – robertklep Jul 19 '16 at 18:18
mongoose@3.8.40 ... sudo npm install mongoose... and i see you version is higher, i will try and answer about it. You can help how to install latest version of mongoose? – Melixion Jul 19 '16 at 20:52
@Melixion `npm install mongoose@latest` – robertklep Jul 19 '16 at 21:43
this help, thinks! – Melixion Jul 19 '16 at 22:53
I want to add that the value that you pass to this function must follow the convention for creating model ids, otherwise you will get this error... `Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters` – Alec Mather May 06 '20 at 23:53
1

@AlecDonaldMather in fact, it must be a valid string representation of an ObjectId :D – robertklep May 07 '20 at 14:02

Azeem Malik · Answer 2 · 2019-02-01T07:50:11.020

7

use this

 var mongoose = require('mongoose');
 var str = '578df3efb618f5141202a196';
 var mongoObjectId = mongoose.Types.ObjectId(str);

edited Feb 01 '19 at 07:50

answered Jul 19 '16 at 10:49

Azeem Malik

490
3
16

David J · Answer 3 · 2023-02-15T21:32:12.980

3

If you're using TypeScript:

const Types = require('mongoose').Types

Then:

comment.user_id = new Types.ObjectId(str)

edited Feb 15 '23 at 21:32

answered Feb 15 '23 at 17:03

David J

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1
9
14

Saif Ur Rehman · Answer 4 · 2022-09-06T07:32:05.377

0

Short code.

const { Types } = require('mongoose');
const objectId = Types.ObjectId('62b593631f99547f8d76c339');

edited Sep 06 '22 at 07:32

answered Sep 06 '22 at 07:20

Saif Ur Rehman

31
1
2

1

how would you do it with import statement instead of require? – Alex Barbu Sep 17 '22 at 16:15
@AlexBarbu import { Types } from 'mongoose'; – Saif Ur Rehman Sep 29 '22 at 05:56

Mongoose String to ObjectID

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