每月計劃月份結束時間

Question

我使用ice_cube創建計劃。從31日開始的每月計劃會在所有月份中缺少31天。我想安排那幾個月的最後一天。如果我的日程從30日開始，我想每個月的30日和2月的最後一天。閏年進一步使問題複雜化。

創建可以處理29日，30日或31日的日程安排的好方法是什麼？

Answer 1

這通過了我的所有規格，但是非常可怕，並且可能會因爲時間超過一年而中斷（我現在不在意）。

class LeasePaymentSchedule 

    def self.monthly(a bunch of args) 
    case start_day 

    when 31 
     schedule = IceCube::Schedule.new(start, scheduler_options) do |s| 
     s.add_recurrence_rule IceCube::Rule.monthly.day_of_month(-1).until(end_time) 
     end 

    when 30,29 
     schedule = IceCube::Schedule.new(start, scheduler_options) do |s| 
     s.add_recurrence_rule IceCube::Rule.monthly.day_of_month(start_day).until(end_time) 
     end 

     schedule.all_occurrences.each do |o| 
     next unless [1,3,6,8,10].include? o.month 
     missed = (o + 1.month).yday 
     # Probably breaks for durations longer than 1 year 
     schedule.add_recurrence_rule IceCube::Rule.yearly.day_of_year(missed).count(1) 
     end 

    else 
     schedule = IceCube::Schedule.new(start, scheduler_options) do |s| 
     s.add_recurrence_rule IceCube::Rule.monthly.day_of_month(start_day).until(end_time) 
     end 
    end 
    schedule 
    end 
end 

這麼多的規格：

Finished in 4.17 seconds 
390 examples, 0 failures 

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shared_examples_for :a_schedule do 
    it 'returns an IceCube Schedule' do 
    schedule.should be_a IceCube::Schedule 
    end 
    it 'should start on the correct day' do 
    schedule.start_time.should eq expected_start 
    end 
    it 'has the right number of occurrences' do 
    schedule.all_occurrences.size.should eq expected_occurrences 
    end 
end 

describe :monthly do 
    let(:expected_occurrences) { 12 } 
    let(:expected_start) { date.next_month.beginning_of_day } 
    let(:schedule) { LeasePaymentSchedule.monthly } 

    before do 
    Date.stub(:today).and_return(date) 
    end 

    shared_examples_for :on_the_28th do 
    let(:date) { Time.parse "#{year}-#{month}-28" } 
    it_behaves_like :a_schedule 
    end 

    shared_examples_for :on_the_29th do 
    let(:date) { Time.parse "#{year}-#{month}-29" } 
    it_behaves_like :on_the_28th 
    it_behaves_like :a_schedule 
    end 

    shared_examples_for :on_the_30th do 
    let(:date) { Time.parse "#{year}-#{month}-30" } 
    it_behaves_like :on_the_29th 
    it_behaves_like :a_schedule 
    end 

    shared_examples_for :on_the_31st do 
    let(:date) { Time.parse "#{year}-#{month}-31" } 
    it_behaves_like :on_the_30th 
    it_behaves_like :a_schedule 
    end 

    shared_examples_for :the_whole_year do 
    context :february do 
     let(:month) { 2 } 
     it_behaves_like :on_the_28th 
    end 
    [ 4, 7, 9, 11 ].each do |month_num| 
     let(:month) { month_num } 
     it_behaves_like :on_the_30th 
    end 
    [ 1, 3, 5, 6, 8, 10, 12].each do |month_num| 
     let(:month) { month_num } 
     it_behaves_like :on_the_31st 
    end 
    end 

    context :a_leap_year do 
    let(:year) { 2012 } 
    context :february_29th do 
     let(:month) { 2 } 
     it_behaves_like :on_the_29th 
    end 
    it_behaves_like :the_whole_year 
    end 

    context :before_a_leap_year do 
    let(:year) { 2011 } 
    it_behaves_like :the_whole_year 
    end 

    context :nowhere_near_a_leap_year do 
    let(:year) { 2010 } 
    it_behaves_like :the_whole_year 
    end 

end 

Answer 2

您可以在本月的最後一天使用day_of_month(-1)。

Answer 3

您可以像平時那樣使用29日，30日和31日的day_of_month設置日程安排。然後使用函數確定哪些月份被跳過，並使用單個事件來設置它們。無可否認，這只是一個黑客攻擊，但是可以解決ice_cube的限制。

下面是一個簡單的腳本，用於確定在任何給定年份哪些月份將被跳過。

require 'date' 
def months_less_than_days(days, year = Date.today.year) 
    months = [] 
    (1..11).each do |m| 
     eom = (Date.new(year, m+1, 1) - 1) 
     months << eom if eom.day < days 
    end 
    eom = (Date.new(year+1, 1, 1) - 1) 
    months << eom if eom.day < days 
    months 
end 

puts months_less_than_days(31) # => [2013-02-28, 2013-04-30, 2013-06-30, 2013-09-30, 2013-11-30] 

Answer 4

這已固定在最新的冰塊：

IceCube::Schedule.new(Time.parse('Oct 31, 2013 9:00am PDT')) do |s| 
    s.add_recurrence_rule(IceCube::Rule.monthly(1)) 
end.first(5) 

[2013-10-31 09:00:00 -0700, 
2013-11-30 09:00:00 -0800, 
2013-12-31 09:00:00 -0800, 
2014-01-31 09:00:00 -0800, 
2014-02-28 09:00:00 -0800]