Update document with error: Cast to string failed for value undefined

Question

I have a simple document with name (require), description (optional). In my model, I update a document with a valid id and I pass description with value undefined because I want to remove this property from document. However, I got following error: message=Cast to string failed for value "undefined" at path "description", name=CastError, type=string, value=undefined, path=description . How do I remove description property on update when user does not provide description? Is it possible?

Thanks

/*jslint indent: 2, node: true, nomen: true*/

'use strict';

var Schema = require('mongoose').Schema;
var mongoose = require('mongoose');

var mongooser = require('../../lib/mongooser');

// Schema

var schema = new Schema({
  name: {
    required: true,
    set: mongooser.trimSetter,
    trim: true,
    type: String,
    unique: true
  },
  description: {
    set: mongooser.trimSetter,
    trim: true,
    type: String
  }
});

// Export

module.exports = mongoose.model('Role', schema);

// Role.js

var update = function (model, callback) {
    var test = { name: 'Users', description: undefined };

    RoleSchema.findByIdAndUpdate(model.id, test, function (error, role) {
      callback(error, role);
    });
};

Krishna Pravin · Accepted Answer · 2019-01-23 05:52:49Z

2

If someone does not want to drop down to native driver, refer to this answer https://stackoverflow.com/a/54320056/5947136

The issue here is using type as a key in Schema.

var schema = new Schema({
 name: {
    required: true,
    set: mongooser.trimSetter,
    trim: true,
    type: String, // <-- This is causing the issue
    unique: true
  },
  description: {
    set: mongooser.trimSetter,
    trim: true,
    type: String // <-- This is causing the issue
  }
});

Refer the above answer for a solution without the need for native driver.

answered Jan 23, 2019 at 5:52

Krishna Pravin

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1 Comment

Kesarion Over a year ago

Thanks! I can't believe I didn't see that. For or extra clarity, using type: String will force mongoose to try and cast the whole object into a string and fail.

Aron Solberg · Accepted Answer · 2013-09-17 20:26:51Z

1

Try dropping down to the native driver like so:

var update = function (model, callback) {
   RoleSchema.update({_id: model.id}, {$unset: {description: 1 }}, callback);
   });
};

answered Sep 17, 2013 at 20:26

Aron Solberg

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2 Comments

Nam Nguyen Over a year ago

is there anyway telling mongoose that here is my new data, update it using this so I don't have to set unset individual fields if they're missing? Thanks

Badri Paudel Over a year ago

You should have also described what is happening here instead of just dropping the piece of code . It could have helped more readers this way.

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