Using Faye without sending a AJAX request

I have searched a lot but didn't get any solution. I am using rails 3.2.16 and ruby 1.9.3. There is a railscast for Messaging with faye which was very helpful. And I have found one more solution which is this:

http://ift.tt/1qzK1lX

The difference between both is that the railscast solution sends AJAX request each time while saving the chat in database which I have done using the other solution without sending any AJAX request. But this would be like public chat.

I am not getting that without AJAX requests in the second solution how can I create private chats, group chats and all. How can I make a channel and pass it. As a plain javascript file serves the publishing code.

Here is my code which I have modified a bit:

index.html.erb

<ul id="chat">
  <% @chat_messages.each do |chat_message| %>
    <li>
      <%= chat_message.created_at.strftime('%-d/%-m/%Y %k:%M:%S') %>
      <%= ':' %>
      <%= chat_message.message %>
    </li>
  <% end %>
</ul>
<hr/>
<form>
  <input id="message" name="message" type="text"></input>
  <input id="submit" type="submit" value="Post"></input>
</form>
<hr/>

realtime_chat_controller.rb

class RealtimeChatController < FayeRails::Controller
  channel '/chat' do
    subscribe do
      Conversation.create(message: message['message'])
    end
  end
end

conversations_controller.rb

class ConversationsController < ApplicationController
  def index
    @chat_messages = Conversation.all
  end
end

conversation.rb

class Conversation < ActiveRecord::Base
  attr_accessible :message
  HISTORY = 20

  # def initialize(options = {})
  #   options.each_pair do |n, v|
  #     public_send("#{n}=", v)
  #   end
  #   self.created_at ||= Time.now
  # end

  def push
    self.class.push self
    self
  end

  def self.push(chat_message)
    @chat_messages ||= []
    @chat_messages << chat_message
    @chat_messages.shift if @chat_messages.size > HISTORY
  end

  # def self.create(options)
  #   new(options).tap { |cm| push cm }
  # end

  def self.recent
    @chat_messages ||= []
  end
end

js file

var client;

client = new Faye.Client('/faye');

client.subscribe('/chat', function(payload) {
  var time;
  time = moment(payload.created_at).format('D/M/YYYY H:mm:ss');
  return $('#chat').append("<li>" + time + " : " + payload.message + "</li>");
});

$(document).ready(function() {
  var button, input;
  input = $('#message');
  button = $('#submit');
  return $('form').submit(function(event) {
    var publication;
    button.attr('disabled', 'disabled');
    button.val('Posting...');
    publication = client.publish('/chat', {
      message: input.val(),
      created_at: new Date()
    });
    publication.callback(function() {
      input.val('');
      button.removeAttr('disabled');
      return button.val("Post");
    });
    publication.errback(function() {
      button.removeAttr('disabled');
      return button.val("Try Again");
    });
    event.preventDefault();
    return false;
  });
});

window.client = client;

application.rb

config.middleware.delete Rack::Lock
    config.middleware.use FayeRails::Middleware, mount: '/faye', :timeout => 25 do
      map '/chat' => RealtimeChatController
      map default: :block
    end