simple social network using node.js and mongodb - node.js

Question

I am trying to build simple social network and I am following this book(Building Node Applications with MongoDB and Backbone)(https://github.com/Swiftam/book-node-mongodb-backbone/tree/master/ch10). However, I just realized that the node.js version has been updated.
I tied to solve some the issue however I got problem in chat.js that states this is the error:
ch10/routes/chat.js:27
data.sessionStore.load(data.sessionID, function(err, session) {
TypeError: Cannot read property 'load' of undefined
module.exports = function(app, models) {
var io = require('socket.io');
var utils = require('connect').utils;
var cookie = require('cookie');
this.io = io;
//var Session = require('connect').middleware.session.Session;
var sio = io.listen(app.server);
sio.configure(function() {
// Utility methods to see if the account is online
app.isAccountOnline = function(accountId) {
var clients = sio.sockets.clients(accountId);
return (clients.length > 0);
};
sio.set('authorization', function(data, accept) {
var signedCookies = cookie.parse(data.headers.cookie);
// var cookies = utils.parseSignedCookies(signedCookies, app.sessionSecret);
// data.sessionID = cookies['express.sid'];
data.sessionStore = app.sessionStore;
data.sessionStore.load(data.sessionID, function(err, session) {
if (err || !session) {
accept("Error", false);
} else {
data.session = session;
accept(null, true);
}
});
});
sio.sockets.on('connection', function(socket) {
var session = socket.handshake.session;
var accountId = session.accountId;
var sAccount = null;
socket.join(accountId);
io.use(function (socket, next) { next(); });
// Immediately trigger the login event
// of this account
app.triggerEvent('event:' + accountId, {
from: accountId,
action: 'login'
});
var handleContactEvent = function(eventMessage) {
socket.emit('contactEvent', eventMessage);
};
var subscribeToAccount = function(accountId) {
var eventName = 'event:' + accountId;
app.addEventListener(eventName, handleContactEvent);
console.log('Subscribing to ' + eventName);
};
// Find the account contacts and subscribe
models.Account.findById(accountId, function subscribeToFriendFeed(account) {
var subscribedAccounts = {};
sAccount = account;
account.contacts.forEach(function(contact) {
if (!subscribedAccounts[contact.accountId]) {
subscribeToAccount(contact.accountId);
subscribedAccounts[contact.accountId] = true;
}
});
// Subscribed to my feed as well
if (!subscribedAccounts[accountId]) {
subscribeToAccount(accountId);
}
});
// Remove listeners if socket disconnects
socket.on('disconnect', function() {
sAccount.contacts.forEach(function(contact) {
var eventName = 'event:' + contact.accountId;
app.removeEventListener(eventName, handleContactEvent);
console.log('Unsubscribing from ' + eventName);
});
app.triggerEvent('event:' + accountId, {
from: accountId,
action: 'logout'
});
});
var cookieParser = require('cookie-parser')(SESSION_SECRET);
// ### Cookie parser
// Wrapper arround Express cookie parser, so we can use the same cookie parser for socket.io.
// Parse Cookie header and populate `socket.request.cookies` with an object keyed by the cookie names.
// Uses signed cookies by passing a secret string, which assigns `socket.request.secret` so it may be used by other middleware.
function cookieParserWrapper (socket, next) {
// request, response and callback
cookieParser(socket.request, {}, next);
}
// Handle incoming chats from client
socket.on('chatclient', function(data) {
sio.sockets.in(data.to).emit('chatserver', {
from: accountId,
text: data.text
});
});
});
});
}

Answer 1

Without testing the code myself or anything.
"TypeError: Cannot read property 'load' of undefined"
That particular error means that data.sessionStore is undefined and that "load" does not exists as a property, since there is literally nothing defined in data.sessionStore.
So the problem in my opinion is that your session system is not working properly. Hope that helps a bit!