ruby on rails 方法小结
1.获取两个日期之间的月份和年份的唯一数组
require 'date'
def doit(first, last)
first = first << 1
(12*last.year + last.month - 12*first.year - first.month + 1).
times.map { |i| (first = first >> 1).strftime("%b %Y") }
end
first = Date.parse('Fri, 02 Dec 2016')
last = Date.parse('Wed, 01 Mar 2017')
doit(first, last)
#=> ["Dec 2016", "Jan 2017", "Feb 2017", "Mar 2017"]
2.rails时间戳，查看自上次以来经过了多长时间
time_ago_in_words @object.created_at
如果你想使用它的控制檯用它玩，請確保你的前言是helper，所以它被加載到控制檯中
helper.time_ago_in_words @object.created_at
对于time_ago_in_words 拓展：
time_ago_in_words(3.minutes.from_now) # => 3 minutes time_ago_in_words(3.minutes.ago) # => 3 minutes time_ago_in_words(Time.now - 15.hours) # => about 15 hours time_ago_in_words(Time.now) # => less than a minute time_ago_in_words(Time.now, include_seconds: true) # => less than 5 seconds from_time = Time.now - 3.days - 14.minutes - 25.seconds time_ago_in_words(from_time) # => 3 days from_time = (3.days + 14.minutes + 25.seconds).ago time_ago_in_words(from_time) # => 3 days
爲了檢驗日期2之間，距離現在不只是一個日期，然後就可以用distance_of_time_in_words
distance_of_time_in_words(@object.created_at, @object.updated_at) eg:### => 12天前
对于 distance_of_time_in_words 这个方法的拓展：
0 <-> 29 secs # => less than a minute 30 secs <-> 1 min, 29 secs # => 1 minute 1 min, 30 secs <-> 44 mins, 29 secs # => [2..44] minutes 44 mins, 30 secs <-> 89 mins, 29 secs # => about 1 hour 89 mins, 30 secs <-> 23 hrs, 59 mins, 29 secs # => about [2..24] hours 23 hrs, 59 mins, 30 secs <-> 41 hrs, 59 mins, 29 secs # => 1 day 41 hrs, 59 mins, 30 secs <-> 29 days, 23 hrs, 59 mins, 29 secs # => [2..29] days 29 days, 23 hrs, 59 mins, 30 secs <-> 44 days, 23 hrs, 59 mins, 29 secs # => about 1 month 44 days, 23 hrs, 59 mins, 30 secs <-> 59 days, 23 hrs, 59 mins, 29 secs # => about 2 months 59 days, 23 hrs, 59 mins, 30 secs <-> 1 yr minus 1 sec # => [2..12] months 1 yr <-> 1 yr, 3 months # => about 1 year 1 yr, 3 months <-> 1 yr, 9 months # => over 1 year 1 yr, 9 months <-> 2 yr minus 1 sec # => almost 2 years 2 yrs <-> max time or date # => (same rules as 1 yr)
0-4 secs # => less than 5 seconds
5-9 secs # => less than 10 seconds
10-19 secs # => less than 20 seconds
20-39 secs # => half a minute
40-59 secs # => less than a minute
60-89 secs # => 1 minute
from_time = Time.now
distance_of_time_in_words(from_time, from_time + 50.minutes) # => about 1 hour
distance_of_time_in_words(from_time, 50.minutes.from_now) # => about 1 hour
distance_of_time_in_words(from_time, from_time + 15.seconds) # => less than a minute
distance_of_time_in_words(from_time, from_time + 15.seconds, include_seconds: true) # => less than 20 seconds
distance_of_time_in_words(from_time, 3.years.from_now) # => about 3 years
distance_of_time_in_words(from_time, from_time + 60.hours) # => 3 days
distance_of_time_in_words(from_time, from_time + 45.seconds, include_seconds: true) # => less than a minute
distance_of_time_in_words(from_time, from_time - 45.seconds, include_seconds: true) # => less than a minute
distance_of_time_in_words(from_time, 76.seconds.from_now) # => 1 minute
distance_of_time_in_words(from_time, from_time + 1.year + 3.days) # => about 1 year
distance_of_time_in_words(from_time, from_time + 3.years + 6.months) # => over 3 years
distance_of_time_in_words(from_time, from_time + 4.years + 9.days + 30.minutes + 5.seconds) # => about 4 years
to_time = Time.now + 6.years + 19.days
distance_of_time_in_words(from_time, to_time, include_seconds: true) # => about 6 years
distance_of_time_in_words(to_time, from_time, include_seconds: true) # => about 6 years
distance_of_time_in_words(Time.now, Time.now