中文相对时间
不知道啥时候开始，流行用相对时间来表示当前的日期，这种方法确实是不错，同 “2007 年 1 月 24 日” 相比，“1 天前” 这种表示确实看起来舒服多了，毕竟人们在思考时间的时候，大多数也是以当前的时间作为基点。
如果是个是个人气很旺的论坛之类，还可以看到某回复发表于 “n 分钟前” 这样的效果，顿时感觉人气和交互度高了很多。
Rails已经内置了对相对时间的支持，time_ago_in_words 这个 helper 就是干这个用的，比如要显示文章发表的相对时间：
post at <%= time_ago_in_words(@article.created_at) %> ago
这样就会显示为诸如 “post at 5 days ago” 这样的效果了～
只不过是英文的，要显示中文的就要翻译一下了，开始我想，把 time_ago_in_words 返回结果中的 days 替换成“天”、month 替换成“月”之类，后来去看了下源码，发现源码很短，重新写一个就行了。
time_ago_in_words 实际上是调用的 distance_of_time_in_words 这个函数，并且以 Time.now 作为第二个参数而已：
def time_ago_in_words(from_time, include_seconds = false)
distance_of_time_in_words(from_time, Time.now, include_seconds)
end
distance_of_time_in_words(from_time, Time.now, include_seconds)
end
这样的话，我们把 distance_of_time_in_words 中的英文改成中文就 ok 了：
-
def distance_of_time_in_words(from_time, to_time = 0, include_seconds = false)
-
from_time = from_time.to_time if from_time.respond_to?(:to_time)
-
to_time = to_time.to_time if to_time.respond_to?(:to_time)
-
distance_in_minutes = (((to_time - from_time).abs)/60).round
-
distance_in_seconds = ((to_time - from_time).abs).round
-
-
case distance_in_minutes
-
when 0..1
-
return (distance_in_minutes == 0) ? '不到 1 分钟' : '1 分钟' unless include_seconds
-
case distance_in_seconds
-
when 0..4 then '不到 5 秒'
-
when 5..9 then '不到 10 秒'
-
when 10..19 then '不到 20 秒'
-
when 20..39 then '半分钟'
-
when 40..59 then '不到 1 分钟'
-
else '1 分钟'
-
end
-
-
when 2..44 then "#{distance_in_minutes} 分钟"
-
when 45..89 then '大约 1 小时'
-
when 90..1439 then "大约 #{(distance_in_minutes.to_f / 60.0).round} 小时"
-
when 1440..2879 then '1 天'
-
when 2880..43199 then "#{(distance_in_minutes / 1440).round} 天"
-
when 43200..86399 then '大约 1 个月'
-
when 86400..525599 then "#{(distance_in_minutes / 43200).round} 个月"
-
when 525600..1051199 then '大约 1 年'
-
else "#{(distance_in_minutes / 525600).round} 年"
-
end
-
end
把上面的代码加到 application_helper.rb 中去，就可以看到中文的相对时间了～ 当然你也可以去掉 “大约” 这个繁琐的词，或者随便改成自己喜欢的中文表达方式～
过两天就做 Chito 的相对时间插件～ 
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