demonstration of schema methods and bcrypt

gistfile1.js

//User, pseudo code!!!!!
var userSchema = {
	name: String,
	email: String,
	password: String,
	gender: String,
	bio: String,
	createdAt: Date,
	age: {type: Number, min: 0, max: 99}
};

var bcrypt = require('bcrypt');

userSchema.pre('save', function(next) {
	var user = this;
	if (!user.isModified('password')) {
		return next();
	}
	bcrypt.genSalt(12, function(err, salt) {
		if (err) {
			return next(err);
		}
		bcrypt.hash(user.password, salt, function(err, hash) {
			if (err) {
				return next(err);
			}
			user.password = hash;
			next();
		});
	});
});

var q = require('q');

userSchema.methods.comparePassword = function(pass) {
	var deferred = q.defer();
	bcrypt.compare(pass, this.password, function(err, isMatch) {
		if (err) {
			deferred.reject(err);
		}
		else {
			deferred.resolve(isMatch)
		}
	});
	return deferred.promise;
};

//inside a controller ... pseudo code!!!!!
User.findOne({email: req.body.email}).exec().then(function(err, user) {
	if (user) {
		user.comparePassword(req.body.password).then(function(isMatch) {
			if (isMatch) {
				req.session.authed = true;
			}
			else {
				return res.redirect('/login');
			}
		})
	}
});