CODEWITHSUNDEEP
node.jsdatabasemongodbexpress
Peplm
Peplm

Reputation: 43

Express.js+Mongo: TypeError: Cannot read property then of undefined

I know there are other questions here asking about the same error, but I couldn't find one specific to my situation.

I try to connect with mongo database:

var dbConn = MongoClient.connect('mongodb://localhost', function (err, client) {
  if (err) throw err;
  var db = client.db('mytestingdb');
});

and I get an error on this part of the code:

app.post('/thanks', function(req, res) {
  if (atendees.checkin === req.body.dbstring) {
    dbConn.then(function(db) { //error here
      delete req.body._id; 
      db.collection('feedbacks').insertOne(req.body);
    })

    res.redirect('/thanks.html')
  }
(...)

The idea is to send a form to a database

I tried to follow this tutorial here:

https://programmingmentor.com/post/save-form-nodejs-mongodb/

But the way he tries to connect to the server:

var dbConn = mongodb.MongoClient.connect('mongodb://localhost:27017');

Also gives me an error (db.collection is not a function). From what I've seen here in StackOverflow, that's because of my version of Mongodb. But how can I translate this to the newer version?

Upvotes: 2

Views: 1043

Answers (1)

jfriend00
jfriend00

Reputation: 708056

In mongodb 3.0, you can do this:

const MongoClient = require('mongodb').MongoClient;

MongoClient.connect(url).then(client => {
    const db = client.db(dbName);
    // write code that uses the db here
    db.collection(...).insertOne(...).then(...);
}).catch(err => {
    // error connecting here
});

This example was taken from the 3.0 doc page here: http://mongodb.github.io/node-mongodb-native/3.0/reference/ecmascriptnext/connecting/

Lots of other ES7 examples here: http://mongodb.github.io/node-mongodb-native/3.0/reference/ecmascriptnext/crud/ which should work in current versions of node.js.

Upvotes: 1

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