"mpromise (mongoose's default promise library) is deprecated" error when testing

Question

For a while I have been getting this error and I decided to fix it today but after an hour trying to fix it I can find the solution.

When I test my mongoose User model this error/warning is generated:

Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html

Here is my test:

  1 var assert = require('chai').assert;
  2 var mongoose = require('mongoose');
  3 var clearDB = require('mocha-mongoose')(require('../../config/database').uri, { skip: ['workouts'] });
  4 var database = require('../../config/database').connect;
  5
  6 var User = require('../../app/models/user');
  7 var user = new User({});
  8
  9 var req_body = {
 10   username: "garyvee",
 11   email: "gary@vaynermedia.com",
 12   password: "secret"
 13 };
 14
 15 describe('User', function() {
 16   beforeEach(function(done) {
 17     user.username = "johnsmith";
 18     user.email = "john@gmail.com";
 19     user.password = "secret";
 20     done();
 21   });
 22
 23   it('can be saved', function() {
 24     return user.save(function(err: any) {
 25       assert.isNull(err);
 26     })
 27   });
 28 });

I think it has something to do with the .save but I don't know how to fix it. Can someone help me and tell me how to fix it so that error/warning isn't shown.

score 31 · Accepted Answer · answered Sep 05 '16 at 15:53

31

You need to plugin a promise library (q, bluebird, the es6 one...)

mongoose.Promise = require('bluebird');

answered Sep 05 '16 at 15:53

Johannes Merz

3,252
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33

Thanks man, Your solutions works :) – Rahul Mangal Nov 21 '16 at 11:43
2

I still get this warning when using the above with node 6.9.1, mongoose 4.8.3 and bluebird 3.4.7. – Jackpile Feb 19 '17 at 10:14
Jackpile, you also have to add it to the models.js too – Jack Robson Mar 12 '17 at 21:01

score 14 · Answer 2 · answered Jan 19 '17 at 13:02

14

From node 4.x you can just use ES6 promises:

const mongoose = require('mongoose');
mongoose.Promise = Promise;

answered Jan 19 '17 at 13:02

olefrank

6,452
14
65
90

score 3 · Answer 3 · answered Dec 08 '16 at 09:29

3

Here's an example that may help. Using es6 modules (instead of CommonJS require) this works for me:

// mongoose's Promise library is deprecated, using es6's: 
import es6Promise from 'es6-promise';
mongoose.Promise = es6Promise.Promise;

answered Dec 08 '16 at 09:29

wojjas

1,046
1
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21

See also this: http://stackoverflow.com/a/38153706/2650732 – wojjas Jan 04 '17 at 13:10

score 1 · Answer 4 · edited May 23 '17 at 11:54

1

you can refer to How to use mongoose Promise - mongo

the page content :

On this page:http://mongoosejs.com/docs/promises.html

The title is Plugging in your own Promises Library

edited May 23 '17 at 11:54

Community

1
1

answered Jan 12 '17 at 04:22

Mr.Thanks

215
3
7

"mpromise (mongoose's default promise library) is deprecated" error when testing

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