rails3 エラー時に指定した画面を出す。

gistfile1.rb

# see http://ar156.dip.jp/tiempo/publish/52
class ApplicationController < ActionController::Base
  protect_from_forgery

  rescue_from Exception, :with => :error_500

  def error_500(exception)
    logger.error "#{exception.message}"
    render :file => "#{Rails.root}/public/500.html", :status => 500, :layout => false, :content_type => 'text/html'
  end
end