Bootstrap for Rails dropdown box not working -

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i reading michael hartl's ruby on rails tutorial. in chapter 8 implement sign in , sign out functionality. running bug in sections create "account" dropdown box. of tests pass , have followed code in book verbatim when hover on or click on "account" dropdown box nothing happens.

here _header.erb file:

<header class="navbar navbar-fixed-top">  	<div class="navbar-inner">  		<div class="container">  			<%= link_to "sample app", root_path, id: "logo" %>  			<nav>  				<ul class="nav pull-right">  					<li><%= link_to "home", root_path %></li>  					<li><%= link_to "help", help_path %></li>  					<% if signed_in? %>  						<li><%= link_to "users", '#' %></li>  						<li id="fat-menu" class="dropdown">  							<a href="#" class="dropdown-toggle" data-toggle="dropdown">  								account <b class="caret"></b>  							</a>  							<ul class="dropdown-menu">  								<li><%= link_to "profile", current_user %></li>  								<li><%= link_to "settings", '#' %></li>  								<li class="divider"></li>  								<li>  									<%= link_to "sign out", signout_path, method: "delete" %>  								</li>  							</ul>  						</li>  					<% else %>  						<li><%= link_to "sign in", signin_path %></li>  					<% end %>  				</ul>  			</nav>  		</div>  	</div>  </header>

and here application.js

//= require jquery  //= require bootstrap  //= require jquery_ujs  //= require_tree .

and gemfile

source 'https://rubygems.org'    gem 'rails', '3.2.3'  gem 'bootstrap-sass', '2.0.0'  gem 'bcrypt-ruby', '3.0.1'    # bundle edge rails instead:  # gem 'rails', :git => 'git://github.com/rails/rails.git'    group :development, :test  	gem 'sqlite3', '1.3.5'  	gem 'rspec-rails', '2.10.0'  	gem 'annotate', '~> 2.4.1.beta'  	gem 'guard-rspec', '0.5.5'  end    # gems used assets , not required  # in production environments default.  group :assets    gem 'sass-rails',   '3.2.4'    gem 'coffee-rails', '3.2.2'      # see https://github.com/sstephenson/execjs#readme more supported runtimes    # gem 'therubyracer', :platforms => :ruby      gem 'uglifier', '2.0.0'  end    gem 'jquery-rails'    group :test  	#gem 'rspec-rails', '2.10.0'  	gem 'capybara', '1.1.2'  	gem 'rb-fchange', '0.0.5'  	gem 'rb-notifu', '0.0.4'  	gem 'win32console', '1.3.0'  	gem 'guard-spork', '0.3.2'  	gem 'spork', '0.9.0'  	gem 'factory_girl_rails', '1.4.0'  end    group :production  	gem 'pg', '0.12.2'  end      # use activemodel has_secure_password  # gem 'bcrypt-ruby', '~> 3.0.0'    # use jbuilder templates json  # gem 'jbuilder'    # use unicorn app server  # gem 'unicorn'    # deploy capistrano  # gem 'capistrano'    # use debugger  # gem 'debugger'

i'm new rails i'm not quite sure other information or code best provide.

any ideas or suggestions on how proceed appreciated.

i think problem might solved removing id="fat-menu" <li id="fat-menu" class="dropdown">.


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