initialize_template_class

# File actionpack/lib/action_controller/base.rb, line 822
      def initialize_template_class(response)
        raise "You must assign a template class through ActionController.template_class= before processing a request" unless @@template_class
        
        response.template = self.class.view_class.new(self.class.view_root, {}, self)
        response.redirected_to = nil
        @performed_render = @performed_redirect = false
      end