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mattbrictson/application.html.erb

Last active August 16, 2023 15:33
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Simpler nested layouts in Rails using the parent_layout helper
Raw
application.html.erb
<%= render("shared/navbar") %>
<div class="container">
<%= render("shared/alerts") %>
<%= render("shared/page_header") %>
<%= yield %>
<%= render("shared/footer") %>
</div>
<% parent_layout "base" %>
Raw
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>
Raw
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
@collimarco
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This should be added to Rails core, would be very useful

@Petecass
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Petecass commented Dec 3, 2016

🎉 👍 👏

@romkaspb
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Thank you, really very useful!

@leouz
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leouz commented Jan 16, 2018

exactly what I was looking for, thank you!

working perfectly on rails 5.1.4 👍

@fgblomqvist
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Doesn't render the output (line 14 in the helper) for me on Rails 5.1.6. As in, only the content gets rendered, not any of the templates (neither parent nor child). The correct HTML ends up in output, but is for some reason never used. Not skilled enough in Rails to know why.

@vsppedro
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vsppedro commented Dec 30, 2019 •
edited

Thanks! 👏 👏 👏

Working perfectly on rails 6.0.1!

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