Cannot call method 'get' of undefined using mongodb with express

Question

I follow a tutorial and have no clue what's wrong. There's no error in my cmd at all. When I open localhost:3000 I saw this error Cannot call method 'get' of undefined and couldn't load the post in my posts collection.

var express = require('express');
var router = express.Router();
var mongo = require('mongodb');
var db = require('monk')('localhost/nodeblog');

/* Homepage blog posts */
router.get('/', function(req, res, next) {
  var db = req.db;
  var posts = db.get('posts');
  console.log(posts)
  posts.find({},{},function(err,posts){
    res.render('index',{
        "posts":posts
    });
  });
});

My jade

block content
    if posts
        each post, i in posts
            h1=post.title

Possible duplicate of TypeError: Cannot call method 'get' of undefined — chridam
– chridam, Commented Oct 25, 2015 at 14:00

mabc224 · Accepted Answer · 2015-10-25 15:16:58Z

1

There is problem, You need to first attach db to req object then use it. Place this function before all routes.

app.use(function(req, res, next) {
  // open connection
  req.db = db;
  next();
});

then use it in route.

var dbs = req.db;

Otherwise simple is, remove this line and run your app.

var db = req.db;

complete code

var express = require('express');
var mongo = require('mongodb');
var db = require('monk')('localhost/nodeblog');

var app = express();

app.use(function(req, res, next) {
  req.db = db;
  next();
});

app.get('/', function(req, res, next) {
  var dbPost = req.db;
  var posts = dbPost.get('posts');
  console.log(posts)
  posts.find({},{},function(err, posts){
    res.render('index',{
        posts: posts
    });
  });
});

app.listen(3000);

edited Oct 25, 2015 at 15:16

answered Oct 25, 2015 at 15:03

mabc224

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12 Comments

Nichole A. Miler Over a year ago

your complete code is my index.js? I got app is not defined

mabc224 Over a year ago

kindly recheck your code, i have tested my code on my system before placing it here. make sure, you have installed all dependencies and also created app object by doing var app = express();

Nichole A. Miler Over a year ago

I got this error at app.use.res.render.message (C:\wamp\www\node_blog\app.js:81:13)

mabc224 Over a year ago

kindly put your code on pastebin and place link here

Nichole A. Miler Over a year ago

weird why not found, hmm

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