Rubyの暗黒面が見えてきた

dashboard_controller.rb

class DashboardController < ApplicationController
  include TabsHelper
  set_tab :dashboard

  def index
  end
end

tabs.erb

<ul class="tabs">
  <%= tab_for :dashboard, dashboard_path %>
  <%= tab_for :hoge, hoge_path %>
  <%= tab_for :fuga, fuga_path %>
</ul>

tabs_helper.rb

module TabsHelper
  module Tabbable
    def set_tab(tab)
      TabsHelper.current_tab = tab
    end
  end

  def self.included(base)
    base.extend Tabbable
  end

  def self.current_tab=(tab)
    @@current_tab = tab
  end

  def tab_for(tab, link, label=nil)
    link_tag = link_to(label || tab.to_s.titleize, link)
    content_tag(:li, link_tag, :class => ('active' if @@current_tab == tab))
  end
end