ruby - 在不需要公开私有(private)字段的情况下制作一个 equals 方法

Question

我正在编写一个 Ruby 类，并想覆盖 == 方法。我想说这样的话:

class ReminderTimingInfo
   attr_reader :times, :frequencies #don't want these to exist

   def initialize(times, frequencies)
      @times, @frequencies = times, frequencies
   end

   ...

   def ==(other)
      @times == other.times and @frequencies == other.frequencies
   end
end

如何在不公开显示时间和频率的情况下执行此操作？

跟进:

class ReminderTimingInfo

  def initialize(times, frequencies)
    @date_times, @frequencies = times, frequencies
  end

  ...

  def ==(other)
    @date_times == other.times and @frequencies == other.frequencies
  end

  protected

  attr_reader :date_times, :frequencies
end

Answer 1

如果将时间和频率访问器设置为 protected ，它们将只能从该类和后代的实例访问(这应该没问题，因为后代无论如何都可以访问实例变量并且应该知道如何正确处理它)。

class ReminderTimingInfo

  # …

protected
  attr_reader :times, :frequencies

end