# File lib/paperclip/attachment.rb, line 363
    def instance_read(attr)
      getter = "#{name}_#{attr}""#{name}_#{attr}"
      responds = instance.respond_to?(getter)
      cached = self.instance_variable_get("@_#{getter}")
      return cached if cached
      instance.send(getter) if responds || attr.to_s == "file_name"
    end