#218 Making Generators in Rails 3

Jun 14, 2010 | 10 minutes | Tools, Rails 3.0

Generators in Rails 3 have been rewritten to use Thor which means the code used to create a generator is quite different. Here you will learn the new way to make generators in Rails 3.

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          bash
        
rails g generator --help
rails g generator layout
rails g layout --help
rails g layout admin
rails g layout foo --skip-stylesheet

          lib/generators/layout/layout_generator.rb
        
class LayoutGenerator < Rails::Generators::Base
  source_root File.expand_path('../templates', __FILE__)
  argument :layout_name, :type => :string, :default => "application"
  class_option :stylesheet, :type => :boolean, :default => true, :desc => "Include stylesheet file."
  
  def generate_layout
    copy_file "stylesheet.css", "public/stylesheets/#{file_name}.css" if options.stylesheet?
    template "layout.html.erb", "app/views/layouts/#{file_name}.html.erb"
  end
  
  private
  
  def file_name
    layout_name.underscore
  end
end

          lib/generators/layout/templates/layout.html.erb
        
<!DOCTYPE html>
<html>
  <head>
    <title>Untitled</title>
    <%- if options.stylesheet? -%>
    <%%= stylesheet_link_tag "<%= file_name %>" %>
    <%- end -%>
    <%%= javascript_include_tag :defaults %>
    <%%= csrf_meta_tag %>
    <%%= yield(:head) %>
  </head>
  <body>
    <div id="container">
      <%% flash.each do |name, msg| %>
        <%%= content_tag :div, msg, :id => "flash_#{name}" %>
      <%% end %>
      <%%= yield %>
    </div>
  </body>
</html>