日期、减法、条件和呈现

Question

我目前正在尝试创建一个将减除两个日期的方法。如下所示：(成熟是一个未来的时期)

  def time_remaining
    # If validated, return time between now and number of days from validation.
    if self.is_validated?
      return (self.maturity > Time.now) ? (self.maturity - Time.now) : 0
    # If not validated, return number of days converted in time
    else
      return self.nb_days.nil? ? 0 : self.nb_days.days
    end
  end

在我看来，我的做法是：

distance_of_time_in_words(project.time_remaining)

这是可行的，但这并不是我真正想要做的，我想要的是，如果减法运算的结果小于一天，就检索若干小时；如果减法结果小于一小时，则检索若干分钟；如果结果等于一天以上，则检索若干天。

成熟度采用这种格式：Wed, 27 Nov 2013 12:42:09 UTC +00:00。你能不能至少给我个提示，说明我该怎么做？

编辑:

我尝试过这样的方法，但它真的很混乱：

def time_remaining
    # If validated, return time between now and number of days from validation.
    if self.is_validated?
      if (self.maturity > Time.now)
        if ((self.maturity - Time.now)/1.day < 1)
          return (self.maturity - Time.now)/1.day.
        elsif ((self.maturity - Time.now) < 1.hour)
          return (self.maturity - Time.now)/1.min
        else
          return (self.maturity - Time.now)
        end
      else
        0
      end
    # If not validated, return number of days converted in time
    else
      return self.nb_days.nil? ? 0 : self.nb_days.days
    end
  end

重点是在这里删除distance_of_time_in_words。

解决方案:感谢@RafałCieślak和gem time_diff。以下是我所做的：

  def remaining_time (project)
    if project.is_validated?
      if ((project.maturity - Time.now)/1.day >= 1)
        result = Time.diff(project.maturity, Time.now, '%d')
        return result[:diff]
      elsif ((project.maturity - Time.now)/1.hour > 1 && (project.maturity - Time.now)/1.hour < 24)
        result = Time.diff(project.maturity, Time.now, '%H')
        return result[:diff]
      elsif ((project.maturity - Time.now)/1.hour < 1)
        result = Time.diff(project.maturity, Time.now, '%N')
        return result[:diff]
      end
    else
      return project.nb_days.nil? ? 0 : project.nb_days.days
    end
  end

Answer 1

这是我入侵得很快的东西。您需要安装比较 gem，并使用以下方法作为帮助器(而不是在您的模型中)。

def time_remaining(time_start, time_end)
  diff_hash = Time.diff(time_start, time_end)
  diff_hash.delete :diff
  output = []

  diff_hash.each do |key, value|
    output.push(pluralize(value, key.to_s)) if value > 0
  end

  output.join(', ')
end

示例：

>> time_remaining 2.days.ago.change(min: 58, hour: 15), Time.now
=> "1 day, 20 hours, 19 minutes, 24 seconds"
>> time_remaining 34.minutes.ago.change(sec: 15), Time.now
=> "33 minutes, 53 seconds"