module ActionDispatch
  class ShowExceptions

    private

    def original_exception(exception)
      if registered_original_exception?(exception)
        exception.original_exception
      else
        exception
      end
    end

    def registered_original_exception?(exception)
      exception.respond_to?(:original_exception) && @@rescue_responses.has_key?(exception.original_exception.class.name)
    end

    def rescue_action_locally_with_original_exception(request, exception)
      rescue_action_locally_without_original_exception(request, original_exception(exception))
    end
    alias_method_chain :rescue_action_locally, :original_exception

    def rescue_action_in_public_with_original_exception(exception)
      rescue_action_in_public_without_original_exception(original_exception(exception))
    end
    alias_method_chain :rescue_action_in_public, :original_exception
  end
end