Icky way to do request-response async handling in RAILS

gistfile1.rb

class SurveyController

  # GET 

  def show
    ss = SurveyState.new(params[:survey])
    ss.next_question_group do |question|
      render :partial => 'question', :object => question
    end
    session[:survey_state] = ss.id
  end

  # POST

  def update
    ss = SurveyState.find(session[:survey_state])
    ss.record_responses(params)
    if ss.more_questions_to_show?
      redirect :show
    elsif ss.done_with_this_survey?
      redirect :show_survey_results
    else
      # implicit return to mainloop; we didn't get the AJAX response for every question and
      # will wait for the rest to show up
    end
  end
end