simple breadcrumb in rails

_breadcrumb.html.erb

<ul class="breadcrumb" id="breadcrumb" >
  <li>
    <%= breadcrumbs.join("<span class='divider'>/</span></li><li>").html_safe %>
  </li>
</ul>

admin_app_controller.rb

def show
  add_to_breadcrumb @admin_app.name, admin_app_path(@admin_app)
end

application_controller.rb

  def self.add_to_breadcrumb(title, link=nil)
    before_filter do |instance|
      instance.add_to_breadcrumb(title, link)
    end
  end

  add_to_breadcrumb "Home", "/"

  def add_to_breadcrumb(title, link=nil)
    @breadcrumbs ||= []
    item = (link.nil? ? title : "<a href='#{link}'>#{title}</a>")
    @breadcrumbs << item unless @breadcrumbs.include?(item)
  end