Subclassing Page

You may subclass the Proton::Page class.

Subclassing in an extension

Create an extension to subclass it:

[_extensions/post/post.rb (rb)]
class Proton::Page::Post < Proton::Page
  # Put some extra methods here
  def css_class
    title.downcase.gsub(' ', '-')
  end
end

Using your subclass

Now in your files, specify the type with type metadata:

[hello.textile (textile)]
title: Hello world
type: post
layout: default
--
Hello, world! This page will be of type Post.

Subclasses in posts

Now in the layout, the page variable will be an instance of Proton::Page::Post.

[_layouts/default.haml (haml)]
%body
  - if page.is_a? Proton::Page::Post
    %h1{class: page.css_class}
      Post:
      = page.title

Changing default layouts per subclass

You can redefine Page::default_layout to change the default layout for the page subclass.

class Proton::Page::Post < Proton::Page
  def default_layout
    'post'  if html?
  end
end