CODEWITHSUNDEEP
javascriptnode.jsmongodbexpressdatabase
practicemakesperfect
practicemakesperfect

Reputation: 414

Object #<MongoClient> has no method 'open'

I've been trying to make a simple site with Node.js, Express.js, and MongoDB. I'm new to these technologies and have been having problem set up the database Here is snippet of code in my index.js file:

var http = require('http'),
    express = require('express'),
    path = require('path'),
    MongoClient = require('mongodb').MongoClient,
    Server = require('mongodb').Server,
    CollectionDriver = require('./collectionDriver').CollectionDriver;

var app = express();
app.set('port', process.env.PORT || 3000);
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

var mongoHost = 'localHost';
var mongoPort = 27017;
var collectionDriver;

var mongoClient = new MongoClient(new Server(mongoHost, mongoPort));
mongoClient.open(function(err, mongoClient) {
  if (!mongoClient) {
      console.error("Error! Exiting... Must start MongoDB first");
      process.exit(1);
  }
  var db = mongoClient.db("MyDatabase");
  collectionDriver = new CollectionDriver(db);
});

After I try to run node index.js in terminal, it says the following:

js-bson: Failed to load c++ bson extension, using pure JS version

/Users/username/dev/ga-final/index.js:31
mongoClient.open(function(err, mongoClient) { //C
            ^
TypeError: Object #<MongoClient> has no method 'open'
at Object.<anonymous> (/Users/username/dev/ga-final/index.js:31:13)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3

What is wrong? Why can't I call open? Can you help me fix this? thanks!

Upvotes: 6

Views: 6881

Answers (2)

squiroid
squiroid

Reputation: 14017

This is happening may be because you are using new version of mongodb it is working fine after I use mongodb driver version 1.4.

npm install [email protected]

Upvotes: 14

clay
clay

Reputation: 6017

Take a look at the mongodb docs. Your mongoClient object is not what you think it is, and that why there isn't an open() method available.

Make your example code look more like theirs:

var MongoClient = require('mongodb').MongoClient
  , assert = require('assert');

// Connection URL
var url = 'mongodb://localhost:27017/myproject';
// Use connect method to connect to the Server
MongoClient.connect(url, function(err, db) {
  assert.equal(null, err);
  console.log("Connected correctly to server");

  db.close();
});

Upvotes: 8

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