Rails template / layout inheritance

child_index.html.haml

-content_for :title do
  Child Title
The rest of the page goes here

child_layout.html.haml

- content_for :site_name do
  = 'Child Layout'
- content_for :stylesheet do
  = stylesheet_link_tag 'child'
- content_for :site_header do
  = render :partial => 'child/header'
= render :template => 'layouts/parent_layout'

parent_layout.html.haml

-# this template is inherited by other layouts, like child_layout
-# and is customized by the content_for blocks there
-# that we handle there (they won't be handled on subsequent calls)
-# unless we did something like this there to check if there is a receiving content_for?
-# otherwise, in this case, yield to the view
-# = content_for?(:stylesheet) ? yield(:stylesheet) : yield
-# see http://guides.rubyonrails.org/layouts_and_rendering.html#using-nested-layouts
!!! Strict
%html{:xmlns=>"http://www.w3.org/1999/xhtml",:'xml:lang'=>"en", :lang=>"en", 'xmlns:fb'=>'http://ogp.me/ns/fb#'}
  %head{:prefix => "fb: http://ogp.me/ns/fb#"}
    - if content_for?(:title)
      - title = yield(:title)
    -else
      - title = 'Welcome'
    %title= "#{yield(:site_name)} - #{ title }"
    = yield(:stylesheet)
  %body
    %div#container
      %div#hd
        = yield(:site_header)
      %div#bd
        %div#main
          %div.b
            %div.wrapper
              -unless notice.blank?
                %p.notice= notice
              = yield
  =yield(:javascript)