mongoose: Deep cloning a mongoose model with arrays inside doesn't work after #6431

I’m using MongoDB 3.6.5 Community, NodeJS 9.11.1 and Mongoose 5.1.2, on Ubuntu 16.04.

Before the changes introduced in this commit to fix #6431, it was possible to do a

_.deepClone(mongooseModel)

where _ is lodash 4.11.1 and mongooseModel is a document that holds an array as one of its properties in the schema.

The error shown in the console looks like the following:

(node:58559) UnhandledPromiseRejectionWarning: TypeError: Class constructor CoreMongooseArray cannot be invoked without ‘new’

Would it be possible to change the way CoreMongooseArray has been implemented in order to make it easier to deep clone?

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 18 (2 by maintainers)

Most upvoted comments

@valterkraemer I was able to reproduce with lodash 4.17.4 and confirm that 4.17.10 fixes it. Thanks for reporting this, I’m glad it’s sorted out.

lineus on May 28, 2018

Is there a unit test for this? I’m seeing the same issue now with mongoose@6.1.4 and lodash@4.17.21

joebowbeer on Jan 4, 2022

Using MongoDB 3.6.3, Mongoose 5.1.2, Lodash 4.17.4 I get the Error Unhandled rejection TypeError: Class constructor CoreMongooseArray cannot be invoked without 'new'. But after updating Lodash to 4.17.10 I don’t get the error anymore.

const mongoose = require('mongoose')
mongoose.Promise = require('bluebird')
const Schema = mongoose.Schema
const _ = require('lodash')

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

const UserSchema = new Schema({
  name: String,
  items: [{
    name: String
  }]
})

const User = mongoose.model('User', UserSchema)

return User.create({
  name: 'Arnold',
  items: [{
    name: 'Item 1'
  }]
})
.then(user => {
  const copy = _.cloneDeep(user)
})

valterkraemer on May 28, 2018

Thank you all for your time. As @valterkraemer and @lineus reported, upgrading lodash to 4.17.10 fixed the problem.

fbudassi on May 28, 2018