gistfile2.rb

  def change_play_game
    @game = Game.find(params[:game_id])
    respond_to do |format|
      format.js do
        render(:update) do |page|
          page[:game_display].replace_html(:partial => '/students/display_for_play', :locals => {:game => @game})
        end
      end
    end
  end

gistfile3.rb

    module InstanceMethods
      def render_with_csv(options = nil, extra_options = {}, &block)
-->>>   return render_without_csv(options, extra_options, &block) unless options and options[:csv]
        send_data Array(options[:csv]).to_comma
      end
    end

trace

NoMethodError (undefined method `[]' for :update:Symbol):
    /vendor/plugins/comma/lib/comma.rb:44:in `render_without_trace_View___newrelic_metric_path__Rendering'
    /vendor/plugins/newrelic_rpm/lib/new_relic/agent/method_tracer.rb:138:in `render'
    /vendor/plugins/newrelic_rpm/lib/new_relic/agent/method_tracer.rb:41:in `trace_method_execution_with_scope'
    /vendor/plugins/newrelic_rpm/lib/new_relic/agent/method_tracer.rb:137:in `render'
    /app/controllers/students_controller.rb:177:in `change_play_game'
    /vendor/rails/actionpack/lib/action_controller/mime_responds.rb:135:in `call'
    /vendor/rails/actionpack/lib/action_controller/mime_responds.rb:135:in `custom'
    /vendor/rails/actionpack/lib/action_controller/mime_responds.rb:164:in `call'
    /vendor/rails/actionpack/lib/action_controller/mime_responds.rb:164:in `respond'
    /vendor/rails/actionpack/lib/action_controller/mime_responds.rb:158:in `each'
    /vendor/rails/actionpack/lib/action_controller/mime_responds.rb:158:in `respond'
    /vendor/rails/actionpack/lib/action_controller/mime_responds.rb:107:in `respond_to'
    /app/controllers/students_controller.rb:175:in `change_play_game'