Organize javascripts and stylesheets like views in rails 3.1

README

Call the helpers 'javascript_include_tags_for_action' and 'stylesheet_link_tags_for_action' in the headers section
of your layout to automatically include javascript and stylesheet files for the current controller and action.

The files are included only if they exist. It is first included the file for all the actions of acontroller (e.g 'events/_all.js')
and then the file for the current action (e.g. 'events/show.js').

You can organize javascripts and stylesheets like views are organized.
Assuming you have the controllers "Events" and "Spaces":

- app/
  - assets/
    - javascripts/
      - events/
        - _all.js
        - index.js
        - show.js
      - spaces/
        - _all.js
        - edit.js
        - index.js
    - stylesheets/
      - events/
        - _all.css
      - spaces/
        - edit.css
        - index.css
        - show.css

application.html.haml

%html
  %head

    ...

    -# Automatically includes js's and css's for the current controller and action
    - javascript_include_tags_for_action
    - stylesheet_link_tags_for_action

    ...

application_helper.rb

module ApplicationHelper

  # Ex: asset_exists?('news/edit', 'css')
  def asset_exists?(asset_name, default_ext)
    !YourApplication::Application.assets.find_asset(asset_name + '.' + default_ext).nil?
  end

  # Includes javascripts for the current controller and action
  # Example: 'assets/events/_all.js' and 'assets/events/show.js'
  def javascript_include_tags_for_action
    ["_all", params[:action]].each do |action|
      asset = "#{params[:controller]}/#{action}"
      concat(javascript_include_tag(asset)) if asset_exists?(asset, "js")
    end
  end

  # Includes stylesheets for the current controller and action
  # Example: 'assets/events/_all.css' and 'assets/events/show.css'
  def stylesheet_link_tags_for_action
    ["_all", params[:action]].each do |action|
      asset = "#{params[:controller]}/#{action}"
      concat(stylesheet_link_tag(asset)) if asset_exists?(asset, "css")
    end
  end

end