数组按日期和月份排序(忽略年份)

时间:2012-07-04 09:32:17

标签: ruby arrays ruby-on-rails-3

我有以下节日阵列:

id = 1, Start_date = 2011-11-01 , End_date = 2016-12-31

[[1, 2011-11-01 , 2016-12-31],
[2, 2011-11-28 , 2016-12-31],
[3, 2011-10-01 , 2015-12-31],
[4, 2011-11-28 , 2021-12-31],
[5, 2010-11-15 , 2016-12-31],
[6, 2011-07-01 , 2017-12-31],
[7, 2012-02-01 , 2013-02-19],
[8, 2011-03-21 , 2015-04-30],
[9, 2012-03-01 , 2016-03-20]]

我需要按start_date从当前日期开始排序,但忽略年份(仅使用月和日)。

实际上这些是节日的开始日期和结束日期。我需要首先显示正在运行的节日(按顺序:start_date)然后显示即将到来的节日(按顺序分别为:start_date)。

例如:

festival A: start_date: 15-may  - end_date: 15-june  
festival B: start_date: 01-june - end_date: 20-june
festival C: start_date: 01-oct  - end_date: 30-oct
  • 如果今天是14月6日,则订单应为A B C
  • 如果今天是6月16日,那么订单应该是:B C A
  • 最后如果今天是1月2日,那么订单应该是:A B C

提前感谢您的回复。

1 个答案:

答案 0 :(得分:3)

假设start_dateend_dateDate个对象:

# get the festivals from the database
festivals = Festival.all

# define the day of interest
day = Date.today

# partition the festivals into running and upcoming
# based on the day of the year (1-366)
running, upcoming = festivals.partition { |f|
  (f.start_date.yday..f.end_date.yday).include? day.yday
}

# sort each array by day of the year
running.sort_by!{ |f| f.start_date.yday }
upcoming.sort_by!{ |f| f.start_date.yday }