view_class

# File actionpack/lib/action_controller/base.rb, line 809
      def self.view_class
        unless @view_class
          # create a new class based on the default template class and include helper methods
          @view_class = Class.new(ActionView::Base)
          @view_class.send(:include, master_helper_module)
        end
        @view_class
      end