application.html.haml

!!!
%html
  %head
    = stylesheet_link_tag "application"
    = javascript_include_tag "application"
    = csrf_meta_tag
  %body{:class => controller.controller_name}
    #banner
      = form_tag root_path, class: 'locale' do
        = select_tag 'set_locale', options_for_select(LANGUAGES, I18n.locale.to_s), onchange: 'this.form.submit()'
        = submit_tag 'submit'
        = javascript_tag "$('.locale input').hide()"
      = title
    #columns
      #side
        #cart
          - if @cart
            = hidden_div_if(@cart.line_items.empty?, id: 'cart') { render @cart }
        %ul
          %li
            = link_to 'Home', main_index_path
          %li
            = link_to 'The Hayloft Grill', main_hayloft_path
          %li
            = link_to 'General Store', store_path
          %li
            = link_to 'Events Calendar', main_entertainment_path
          %li
            = link_to 'About Us', main_about_path
            
        - if session[:user_id]
          %ul
            %li
              = link_to 'Orders',   orders_path
            %li
              = link_to 'Products', products_path
            %li
              = link_to 'Users',    users_path
          = button_to 'Logout', logout_path, method: :delete
      #main
        = yield

application_controller.rb

#app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  before_filter :set_i18n_locale_from_params
  before_filter :authorize
  protect_from_forgery
  
  def hayloft
    @title = "The Hayloft Grill"
  end

  def entertainment
    @title = "Entertainment and Events"
  end

  def about
    @title = "About Us/Contact"
  end
  
  def store
    @title = "General Store"
  end
  
  protected
  
    def set_i18n_locale_from_params
      if params[:locale]
        if I18n.available_locales.include?(params[:locale].to_sym)
          I18n.locale = params[:locale]
        else
          flash.now[:notice] = "#{params[:locale]} translation not available"
          logger.error flash.now[:notice]
        end
      end
    end
    
    def default_url_options
      { locale: I18n.locale }
    end
  
    def authorize
      unless User.find_by_id(session[:user_id])
        redirect_to login_url, notice: "Please log in"
      end
    end
  
    def current_cart
      Cart.find(session[:cart_id])
    rescue ActiveRecord::RecordNotFound
      cart = Cart.create
      session[:cart_id] = cart.id
      cart
    end
end

application_helper.rb

#app/helpers/application_helper.rb

module ApplicationHelper

  # Return a title on a per-page basis.
  def title
    base_title = "The Maverick Saloon"
    if @title.nil?
      base_title
    else
      "#{base_title} | #{@title}"
    end
  end

  # hide shopping cart if empty
  def hidden_div_if(condition, attributes = {}, &block)
    if condition
      attributes["style"] = "display: none"
    end
    content_tag("div", attributes, &block)
  end
end

routes.rb

#config/routes.rb


Mavericksaloon::Application.routes.draw do
  
  controller :sessions do
    get 'login' => :new
    post 'login' => :create
    delete 'logout' => :destroy
  end
  scope '(:locale)' do
    resources :users
    resources :orders
    resources :line_items
    resources :carts
    resources :products do
      get :who_bought, on: :member
    end
  end
  
  get "main/index"
  get "main/hayloft"
  get "main/merchandise"
  get "main/entertainment"
  get "main/about"
  get "products/index"
  get 'admin' => 'admin#index'
  get "store/index", as: 'store'
  post "store/index", as: 'store'
  
  # The priority is based upon order of creation:
  # first created -> highest priority.

  # Sample of regular route:
  #   match 'products/:id' => 'catalog#view'
  # Keep in mind you can assign values other than :controller and :action

  # Sample of named route:
  #   match 'products/:id/purchase' => 'catalog#purchase', :as => :purchase
  # This route can be invoked with purchase_url(:id => product.id)

  # Sample resource route (maps HTTP verbs to controller actions automatically):
  #   resources :products

  # Sample resource route with options:
  #   resources :products do
  #     member do
  #       get 'short'
  #       post 'toggle'
  #     end
  #
  #     collection do
  #       get 'sold'
  #     end
  #   end

  # Sample resource route with sub-resources:
  #   resources :products do
  #     resources :comments, :sales
  #     resource :seller
  #   end

  # Sample resource route with more complex sub-resources
  #   resources :products do
  #     resources :comments
  #     resources :sales do
  #       get 'recent', :on => :collection
  #     end
  #   end

  # Sample resource route within a namespace:
  #   namespace :admin do
  #     # Directs /admin/products/* to Admin::ProductsController
  #     # (app/controllers/admin/products_controller.rb)
  #     resources :products
  #   end

  # You can have the root of your site routed with "root"
  # just remember to delete public/index.html.
  root :to => 'main#index'

  # See how all your routes lay out with "rake routes"

  # This is a legacy wild controller route that's not recommended for RESTful applications.
  # Note: This route will make all actions in every controller accessible via GET requests.
  # match ':controller(/:action(/:id(.:format)))'
end