define_cached_method

# File activesupport/lib/active_support/code_generator.rb, line 14
      def define_cached_method(name, as: name)
        name = name.to_sym
        as = as.to_sym
        @methods.fetch(name) do
          unless @cache.method_defined?(as)
            yield @sources
          end
          @methods[name] = as
        end
      end