Mongoose String to ObjectID

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 

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

And of course I included the mongoose BEFORE ALL CALLS

import * as mongoose from 'mongoose'; 

nothing works.

2 Answers

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 } 

use this

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