Rails Memcache undefined class/module issue solution

class << Marshal
  def load_with_autoload(*args)
    begin
      load_without_autoload(*args)
    rescue [ArgumentError, NameError] => ex
      msg = ex.message
      if msg =~ /undefined class\/module/
        mod = msg.split(' ').last
        if Dependencies.load_missing_constant(self, mod.to_sym)
          load(*args)
        else
          raise ex
        end
      else
        raise ex
      end
    end
  end
  alias_method :load_without_autoload, :load
  alias_method :load, :load_with_autoload
end

 原来可以用Marshal搞定