mattbrictson/application.html.erb

## application.html.erb
<%= render("shared/navbar") %>

<div class="container">

  <%= render("shared/alerts") %>
  <%= render("shared/page_header") %>

  <%= yield %>

  <%= render("shared/footer") %>

</div>

<% parent_layout "base" %>

## base.html.erb
<!DOCTYPE html>
<html>
  <head>
    <%= stylesheet_link_tag("application", "data-turbolinks-track" => true) %>
    <%= javascript_include_tag("application", "data-turbolinks-track" => true) %>

    <%= yield(:head) %>

    <meta charset="utf8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <%= csrf_meta_tags %>

    <title>
      <%= yield(:title) + " – " if content_for?(:title) %>
      RailsStarter
    </title>
  </head>
  <body>

    <%= yield %>

  </body>
</html>

## layouts_helper.rb
module LayoutsHelper
  # Used to achieve nested layouts without content_for. This helper relies on
  # Rails internals, so beware that it make break with future major versions
  # of Rails. Inspired by http://stackoverflow.com/a/18214036
  #
  # Usage: For example, suppose "child" layout extends "parent" layout.
  # Use <%= yield %> as you would with non-nested layouts, as usual. Then on
  # the very last line of layouts/child.html.erb, include this:
  #
  #     <% parent_layout "parent" %>
  #
  def parent_layout(layout)
    @view_flow.set(:layout, output_buffer)
    output = render(template: "layouts/#{layout}")
    self.output_buffer = ActionView::OutputBuffer.new(output)
  end
end
	<%= render("shared/navbar") %>

	<div class="container">

	<%= render("shared/alerts") %>
	<%= render("shared/page_header") %>

	<%= yield %>

	<%= render("shared/footer") %>

	</div>

	<% parent_layout "base" %>
	<!DOCTYPE html>
	<html>
	<head>
	<%= stylesheet_link_tag("application", "data-turbolinks-track" => true) %>
	<%= javascript_include_tag("application", "data-turbolinks-track" => true) %>

	<%= yield(:head) %>

	<meta charset="utf8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">

	<%= csrf_meta_tags %>

	<title>
	<%= yield(:title) + " – " if content_for?(:title) %>
	RailsStarter
	</title>
	</head>
	<body>

	<%= yield %>

	</body>
	</html>
	module LayoutsHelper
	# Used to achieve nested layouts without content_for. This helper relies on
	# Rails internals, so beware that it make break with future major versions
	# of Rails. Inspired by http://stackoverflow.com/a/18214036
	#
	# Usage: For example, suppose "child" layout extends "parent" layout.
	# Use <%= yield %> as you would with non-nested layouts, as usual. Then on
	# the very last line of layouts/child.html.erb, include this:
	#
	# <% parent_layout "parent" %>
	#
	def parent_layout(layout)
	@view_flow.set(:layout, output_buffer)
	output = render(template: "layouts/#{layout}")
	self.output_buffer = ActionView::OutputBuffer.new(output)
	end
	end