javascript - Node Mongodb TypeError: Cannot read property 'find' of undefined -


still working on rest service mongo , node , got error
it's kind of weird cause have route call users in mongo , runs out problems, difference it's i'm using 'find' fro , 'findone' ones i'm calling id.
read findone it's depreciate in mongo 4 or more can't find proper syntax it.

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these package , .js i'm working with. 

//app.js    var express = require('express');  var app = express();  var morgan = require('morgan');  var bodyparser = require('body-parser');  var users = require('./routes/users');  //app settings  //configure app jade rendering engine  app.set('view engine','jade');  app.use(express.static('public'));  //add morgan  app.use(morgan('dev')); /* 'default','short','tiny','dev' */  app.use(bodyparser.urlencoded({extended:false}))  app.use(bodyparser.json())    //root '/' request  app.get('/', function(req, res) {  res.render('index');  });      // services request  app.get('/services', function(req, res) {  res.render('services');  });    // users request  app.get('/users', users.findall);  app.get('/users/:id', users.findbyid);  app.post('/users', users.adduser);  app.put('/users/:id', users.updateuser);  app.delete('/users/:id', users.deleteuser);    // connectiong db mongo  var mongo = require('mongodb');  var server = mongo.server,      db = mongo.db,      bson = mongo.bsonpure;    var server = new server('localhost', 27017, {auto_reconnect: true});  db = new db('test_gwi', server);    db.open(function(err, db) {      if(!err) {          console.log("connected 'test_gwi' database");          db.collection('users', {strict:true}, function(err, collection) {              if (err) {                  console.log("the 'users' collection doesn't exist. creating sample data...");                  populatedb();              }          });      }  });    //mongo querys & shit      //port listening  app.listen(3000);  console.log('listening on port 3000...');

//users  var mongo = require('mongodb');    var server = mongo.server,      db = mongo.db,      bson = mongo.bsonpure;    var server = new server('localhost', 27017, {auto_reconnect: true});  db = new db('test_gwi', server);    db.open(function(err, db) {      if(!err) {          console.log("connected 'test_gwi' database");          db.collection('users', {strict:true}, function(err, collection) {              if (err) {                  console.log("the 'test_gwi' collection doesn't exist. creating sample data...");                  populatedb();              }          });      }  });    exports.findbyid = function(req, res) {      var id = req.params.id;      console.log('retrieving user: ' + id);      db.collection('users', function(err, collection) {          collection.find({'_id':new bson.objectid(id)}, function(err, item) {              res.send(item);          });      });  };    exports.findall = function(req, res) {      db.collection('users', function(err, collection) {          collection.find().toarray(function(err, items) {              res.send(items);          });      });  };


package 

{    "name": "testgwi",    "version": "1.0.0",    "description": "rest services",    "main": "index.js",    "scripts": {      "test": "echo \"error: no test specified\" && exit 1"    },    "author": "",    "license": "isc",    "dependencies": {      "body-parser": "^1.17.2",      "express": "^4.15.4",      "jade": "^1.11.0",      "mongoose": "^4.11.7",      "morgan": "^1.8.2"    }  }


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