Best practice for structuring Express routes that handle MongoDB queries - node.js

Question

I am building a RESTful service for querying a movie database using
Express.js, Node.js and MongoDB and I am a beginner on all of them.
My question is what is the best practice for structuring db queries with Node so that I take advantage of the callback mechanisms and not block the server but at the same time not write bloated code.
I modified the code provided by the express-generator and I think it achieves the former but not the latter. What are your comments?
If you could provide a general skeleton for an Express route that handles db queries, I would appreciate it.
Below is my code
var findMovie = function(db, callback, req, res) {
var path = req.path.split("\/");
var cursor = db.collection('movies').find({"_id" : ObjectId(path[path.length - 2])});
var query = [];
cursor.each(function(err, doc) {
assert.equal(err, null);
if (doc != null) {
query.push(doc);
} else {
res.json(query);
callback();
}
});
}
router.get('/movies/:id/info/', function(req, res, next){
MongoClient.connect(url, function(err, db) {
assert.equal(null, err);
findMovie(db, function() {
db.close();
}, req, res);
});
});

Answer 1

First if you use mongoDB in node i will definately recommend to use mongoose or some other object modeling tool, its much easier than native driver.
then it might look like this:
/model/user.js
var mongoose = require('mongoose');
var UserSchema = new mongoose.Schema({
createdAt: {type: Date, default: Date.now},
updatedAt: {type: Date, default: Date.now},
email: {type: String, unique: true, required: true},
password: {type: String, required: true},
active: {type: Boolean, default: true},
role: {type: String, default: 'user'},
accessLevel: {type: Number, default: 1}
}, {
collection: 'users'
});
module.exports = mongoose.model('User', UserSchema);
/controllers/users.js
var User = require('../model/user');
exports.create (req, res, next) {
var newUser = new User(req.body);
newUser.save(function (err) {
if (err)
return next(err);
res.json({
message: 'User created'
});
});
}
exports.listAll (req, res, next) {
User.find({}, function (err, users) {
if (err)
return next(err);
res.json(users)
});
}
exports.getById (req, res, next) {
User.findById(req.params.id, function (err, user) {
if (err)
return next(err);
res.json(user)
});
}
/routes/users.js
var controller = require('../controllers/users');
var router = require('express').Router();
router.route('/users')
.post(controller.create)
.get(controller.listAll)
router.route('/users/:id')
.get(controller.getById)
.delete(controller.remove)