Instalowanie jQuery w Railsach 3.2.13

Mam problem z uruchomieniem jQuery w Ruby on Rails 3.2.13. Sprawdziłem tutoriale, przeszukałem youtube itp. I nadal nie mogę go uruchomić.

Mówiąc dokładniej, mam problemy z używaniem jQuery ui. Nie mogę uruchomić widgetu akordeonu. Nie mogę nawet uzyskać prostego jQuery (np. Wyświetlenie komunikatu alertu hello) do pracy na ROR.

Twoja pomoc jest bardzo mile widziana. Dzięki!

Oto mój plik application.html.erb:

 <!DOCTYPE html>
    <html>
    <head>
      <title>TestProj</title>
      <%= stylesheet_link_tag    "application", :media => "all" %>
      <%= javascript_include_tag "application" %>
      <%= csrf_meta_tags %>
    </head>
    <body>

    <%= yield %>

    </body>
    </html>

Oto mój plik klejnotów:

source 'https://rubygems.org'

gem 'rails', '3.2.13'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

gem 'sqlite3'


# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer', :platforms => :ruby

  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# To use Jbuilder templates for JSON
# gem 'jbuilder'

# Use unicorn as the app server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'debugger'

Jej jest mój plik application.js:

// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// the compiled file.
//
// WARNING: THE FIRST BLANK LINE MARKS THE END OF WHAT'S TO BE PROCESSED, ANY BLANK LINE SHOULD
// GO AFTER THE REQUIRES BELOW.
//
//= require jquery
//= require jquery_ujs
//= require_tree .


$(document).ready(function() {
 alert('Thanks for visiting!');
});

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