Sample for sidebar rendering

controller_domains.rb

class Domains < MainController
  
  def index
    @title = 'Domains'
    @domains = Domain
    @sidebar = render_sidebar
  end

  def edit(id)
    @domain = Domain[id]
    if @domain.nil?
      flash[:error] = 'sorry, this domain doesn\'t exist'
      redirect_referrer
    end
    @title = "#{@domain.name} domain"
    @sidebar = render_sidebar
  end

# ...

  private

  def render_sidebar
    render_partial :sidebar
  end

layout_default.xhtml

      <div class="row-fluid">
        <div class="span3">
          <div class="well sidebar-nav">
            #{@sidebar}
          </div><!--/.well -->
        </div><!--/span-->
        <div class="span9">

	<?r [:success, :error, :info].each do |type| ?>
            <?r if flash[type] ?>

	  <div class="alert alert-block alert-#{type} fade in">
            <a class="close" data-dismiss="alert" href="#">×</a>
            <h4 class="alert-heading">#{type.capitalize}</h4>
            <p>#{flash[type].capitalize}</p>
          </div>

         <?r end ?>
	<?r end ?>

        #{@content}

        </div><!--/span-->
      </div><!--/row-->

view_domains_sidebar.xhtml

<ul class="nav nav-list">
  <li class="nav-header">Forward Zones</li>
  <p><em>
  #{@sidebar}
  </em></p>
</ul>