def show
      respond_to do |wants|
        wants.html { presenter }
        wants.json { presenter }
        additional_response_formats(wants)
      end
    end
def show
      respond_to do |wants|
        wants.html { presenter }
        wants.json { presenter }
        additional_response_formats(wants)
      end
    end
GET /concern/parent/:parent_id/file_sets/:id