好吧...

class Class
  def name_to_sym
    self.to_s.downcase.to_sym
  end
end

class Foobar; end

Foobar.name_to_sym

^_^

#1 楼 @lgn21st 这个……破坏性太强

那个没啥破坏性，哈哈

@lgn21st 已经猜中真相了

class Foobar; end
Foobar.name.to_sym

:"#{self}"

#1 楼 @lgn21st monkey patch , yeah!!