include_controller_header.rb

module ApplicationHelper
  def controller_header_exists?
    app_views = File.join(Rails.root, "app", "views")
    controller_header = File.join(app_views, "#{controller_name}/_header.html.erb")
    File.exists? controller_header
  end

  def controller_header_partial
    "#{controller_name}/header"
  end

  # Use this in your layout/application.html.erb
  # <%= include_controller_header %>
  def include_controller_header
    if controller_header_exists?
      render :partial => controller_header_partial
    end
  end
end