Cool Breadcrumb Method (rails, haml, and memcached?)

breadcumbs.rb

def active_site_links
  # Possible memcache candidate
  c = %w{editions forms questions question_answers}
  h = c.inject({}) {|a,x| a[x.to_sym] = {:name => x}; a }
  if h.has_key? controller.controller_name.to_sym
    h[controller.controller_name.to_sym][:active] = true
  end
  h
end

# this method creates the link_to links for #site-nav
def site_nav_links
  capture_haml do
    active_site_links.each do |k,v|
      haml_tag(:li, :class => v.has_key?(:active) ? 'active' : "") do
        haml_concat link_to v[:name], url_for(:controller => v[:name], :action => :index)
      end
    end
  end
end