(node:63208) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead

node.js mongodb mongoose
aditya kumar picture aditya kumar · Aug 22, 2018 · Viewed 55.6k times · Source

Where is this error coming from? I am not using ensureIndex or createIndex in my Nodejs application anywhere. I am using yarn package manager.

Here is my code in index.js

import express from 'express';
import path from 'path';
import bodyParser from 'body-parser';
import mongoose from 'mongoose';
import Promise from 'bluebird';

dotenv.config();
mongoose.Promise = Promise;
mongoose.connect('mongodb://localhost:27017/bookworm', { useNewUrlParser: true });

const app = express();

Answer

user10249973 picture user10249973 · Aug 22, 2018

The issue is that mongoose still uses collection.ensureIndex and should be updated by them in the near future. To get rid of the message you can downgrade by using version 5.2.8 in your package.json (and delete any caches, last resort is to uninstall it the install it with npm install [email protected]):

"mongoose": "^5.2.8"

EDIT: As of this edit, Mongoose is now at v5.4.13. Per their docs, these are the fixes for the deprecation warnings...

mongoose.set('useNewUrlParser', true);
mongoose.set('useFindAndModify', false);
mongoose.set('useCreateIndex', true);

Replace update() with updateOne(), updateMany(), or replaceOne()

Replace remove() with deleteOne() or deleteMany().

Replace count() with countDocuments(), unless you want to count how many documents are in the whole collection (no filter). In the latter case, use estimatedDocumentCount().

Related questions

How do I update/upsert a document in Mongoose?

Perhaps it's the time, perhaps it's me drowning in sparse documentation and not being able to wrap my head around the concept of updating in Mongoose :) Here's the deal: I have a contact schema and model (shortened properties): var mongoose = …

Read More
E11000 duplicate key error index in mongodb mongoose

Following is my user schema in user.js model - var userSchema = new mongoose.Schema({ local: { name: { type: String }, email : { type: String, require: true, unique: true }, password: { type: String, require:true }, }, facebook: { id : { type: String }, token : { type: String }, email : { type: …

Read More
How to sort in mongoose?

I find no doc for the sort modifier. The only insight is in the unit tests: spec.lib.query.js#L12 writer.limit(5).sort(['test', 1]).group('name') But it doesn't work for me: Post.find().sort(['updatedAt', 1]);

Read More