(node:3341) DeprecationWarning: Mongoose: mpromise

Question

I\'m trying to develop a class on the top of the mongoose with my custom methods, so I extended the mongoose with my own class but when I invoke to create a new car method i

Answer 1

var mongoose = require('mongoose');
mongoose.Promise = global.Promise;
db = mongoose.connect(env.DATABASE_URI, function(){
  //
})

this work for me.

Answer 2

var mydb;
var uri = 'mongodb://localhost/user1';
var promise = mongooose.connect(uri,{
      useMongoClient: true,
});
promise.openUri(uri,function(errr,db){
if(errr){
        throw errr;
      }else{
        console.log("Connection Successfull");      
        mydb = db;
      }
});

One needs to have connection with the help of promise in the latest version of mongoose [this is the link][1] [1]: http://mongoosejs.com/docs/promises.html

Answer 3

Just add the second parameter as an object to the connect() method.

mongoose.connect('dbUrl', {
  useMongoClient: true
});

See: http://mongoosejs.com/docs/connections.html#use-mongo-client

Answer 4

Mongoose 4.8.6

If you catch error like this:

(node:9600) DeprecationWarning: Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html

You need also to set in options which promise library to use for the driver.

mongoose.Promise = global.Promise
mongoose.connect(uri, { useMongoClient: true, options: { promiseLibrary: mongoose.Promise }})

Answer 5

I think you have your answer but I use global.promise with error handling

// MongoDB connection
mongoose.Promise = global.Promise;

var promise = mongoose.connect('mongodb://localhost:27017/test_db', {
  useMongoClient: true,
});

promise.then(function(db) {
    console.log("Connected to database!!!");
}, function(err){
    console.log("Error in connecting database " + err);
});

Answer 6

While the answer above is accurate and works, you have to account for the issue of Performance if you have a real, production Node app.

The solution above will use native ES6 promises - which are 4X slower than bluebird in the benchmarks I've shared below. This could dramatically affect the performance of an API written in Node and using MongoDB.

I recommend using Bluebird:

// Assuming you store the library in a var called mongoose
var mongoose = require('mongoose');

// Just add bluebird to your package.json, and then the following line should work
mongoose.Promise = require('bluebird');

Benchmark Results

Platform: (using latest Node at time of writing)

• Linux 4.4.0-59-generic x64
• Node.JS 6.9.4
• V8 5.1.281.89
• Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz × 4
• 16 GB RAM with 500 GB SSD

---

    | file                                      | time(ms) | memory(MB) |
    |-------------------------------------------|----------|------------|
    | callbacks-baseline.js                     | 114      | 25.09      |
    | callbacks-suguru03-neo-async-waterfall.js | 152      | 32.98      |
    | promises-bluebird-generator.js            | 208      | 29.89      |
    | promises-bluebird.js                      | 223      | 45.47      |
    | promises-cujojs-when.js                   | 320      | 58.11      |
    | promises-then-promise.js                  | 327      | 64.51      |
    | promises-tildeio-rsvp.js                  | 387      | 85.17      |
    | promises-lvivski-davy.js                  | 396      | 81.18      |
    | callbacks-caolan-async-waterfall.js       | 527      | 97.45      |
    | promises-dfilatov-vow.js                  | 593      | 148.30     |
    | promises-calvinmetcalf-lie.js             | 666      | 122.78     |
    | generators-tj-co.js                       | 885      | 121.71     |
    | promises-obvious-kew.js                   | 920      | 216.08     |
    | promises-ecmascript6-native.js            | 931      | 184.90     |
    | promises-medikoo-deferred.js              | 1412     | 158.38     |
    | streamline-generators.js                  | 1695     | 175.84     |
    | observables-Reactive-Extensions-RxJS.js   | 1739     | 218.96     |
    | streamline-callbacks.js                   | 2668     | 248.61     |
    | promises-kriskowal-q.js                   | 9889     | 410.96     |
    | observables-baconjs-bacon.js.js           | 21636    | 799.09     |
    | observables-pozadi-kefir.js               | 51601    | 151.29     |
    | observables-caolan-highland.js            | 134113   | 387.07     |