def set(path)
      raise Errno::ENOENT, path unless File.exist?(path)

      self.value = path
    end
def set(path)
      raise Errno::ENOENT, path unless File.exist?(path)

      self.value = path
    end
Set the file field to the given path

 @param [String] path
 @raise [Errno::ENOENT] if the file doesn't exist