simple social network using node.js and mongodb -

i trying build simple social network , following book(building node applications mongodb , backbone)(https://github.com/swiftam/book-node-mongodb-backbone/tree/master/ch10). however, realized node.js version has been updated.

i tied solve issue got problem in chat.js states 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 see if account 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(); });         // trigger login event         // of 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 ' + eventname);         };          // find account contacts , 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 feed             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 ' + eventname);             });             app.triggerevent('event:' + accountid, {                 from: accountid,                 action: 'logout'             });         });                       var cookieparser = require('cookie-parser')(session_secret);                  // ### cookie parser                  // wrapper arround express cookie parser, can use same cookie parser socket.io.                 // parse cookie header , populate `socket.request.cookies` object keyed cookie names.                 // uses signed cookies passing secret string, assigns `socket.request.secret` may used other middleware.            function cookieparserwrapper (socket, next) {             // request, response , callback           cookieparser(socket.request, {}, next);             }           // handle incoming chats client         socket.on('chatclient', function(data) {             sio.sockets.in(data.to).emit('chatserver', {                 from: accountid,                 text: data.text             });         });     });  });  } 

without testing code myself or anything.

"typeerror: cannot read property 'load' of undefined"

that particular error means data.sessionstore undefined , "load" not exists property, since there literally nothing defined in data.sessionstore.

so problem in opinion session system not working properly. hope helps bit!