How to pass data to Mongodb using Node.js, websocket and total.js

I am trying to pass data to Mongodb using Websocket and total.js. In my homepage.html I can get the user input and connect to the server via websocket after clicking the save button.

In default.js is my server side code. At this point the app hat got the user input and connected to the server correctly, but how can I save data to mongodb now?

This is my homepage.html

<br />
<div>
<input type="text" name="message" placeholder="Service" maxlength="200" style="width:500px" />
<button name="send" >Save</div>
</div>
<br />

<script type="text/javascript">
  var socket = null;
  $(document).ready(function() {
    connect();
    $('button').bind('click', function() {

        if (this.name === 'send') {                     
            console.log(send());
            return;
        }           

    });
});
function connect() {
    if (socket !== null)
        return;
    socket = new WebSocket('ws://127.0.0.1:8000/');

    socket.onopen = function() {
        console.log('open');
    };

    socket.onmessage = function(e) {
        var el = $('#output');
        var m = JSON.parse(decodeURIComponent(e.data)).message;
        el.val(m + '\n' + el.val());
    };

    socket.onclose = function(e) {
        // e.reason ==> total.js client.close('reason message');
        console.log('close');
    };
}

function send() {
    var el = $('input[name="message"]');
    var msg = el.val();

    if (socket !== null && msg.length > 0)
        socket.send(encodeURIComponent(JSON.stringify({ message: msg })));

    el.val('');
    return msg;
}

This is my default.js

 exports.install = function(framework) {
 framework.route('/', view_homepage);
 framework.route('/usage/', view_usage);
 framework.websocket('/', socket_homepage, ['json']);

 };

 function view_usage() {
 var self = this;
 self.plain(self.framework.usage(true));
 }

function view_homepage() {
var self = this;
self.view('homepage');
}
function socket_homepage() {
    var controller = this;
    controller.on('open', function(client) {
    console.log('Connect');    
});

controller.on('message', function(client, message) {
    console.log(message);
 /*
 var self = this;
 var message = MODEL('message').schema;
 var model = self.body;
 var message = new message({ message: model.message }).save(function(err) {
    if (err)
        self.throw500(err);

    // Read all messages
    message.find(self.callback());
});   
*/      
});
controller.on('error', function(error, client) {
    framework.error(error, 'websocket', controller.uri);
});
}

Any help Please!!!

This is complete project

---Update---

In this function i use to save data to MongoDB but it didn't give any error.also Didnt save the data to database.i not sure my code is write or wrong

  controller.on('message', function(client, message) {
    console.log(message);
 /*
 var self = this;
 var message = MODEL('message').schema;
 var model = self.body;
 var message = new message({ message: model.message }).save(function(err) {
    if (err)
        self.throw500(err);

    // Read all messages
    message.find(self.callback());
});   
*/      
});

This my mongoose.js

var mongoose = require('mongoose');
mongoose.connect('mongodb://totaldemo:123456@ds029979.mongolab.com:29979/totaldemo');
global.mongoose = mongoose;

This is my user.js

 var userSchema = mongoose.Schema({ user: String})
 exports.schema = mongoose.model('user', userSchema,'user');
 exports.name = 'user';