merb-to-rails3_controller_exceptions_handling.rb

class ApplicationController < ActionController::Base
  protect_from_forgery

  rescue_from MerbToRails3::ControllerExceptions::Base, :with => :handle_exception

  protected

  def handle_exception(e)
    if action_name = e.action_name
      self.status = e.status
      send(action_name)
    else
      server_error
    end
  end

  def server_error
    render_error :server_error
  end

  def not_found
    render_error(:not_found)
  end

  def render_error(name)
    render :file => "exceptions/#{name}", :layout => "error"
  end
end