ruby-on-rails - 如何将整数转换为日期数组？

Question

如果用户使用 days_challenge: 5 创建挑战& committed: ["mon", "tue", "wed", "thu", "fri"]那么我们如何从 date_started: "2016-04-20" 创建一个日期数组直到挑战的最后一天，使用名为 dates_challenged 的模型方法？

create_table "challenges", force: true do |t|
  t.string   "action"
  t.date     "date_started"
  t.text     "committed",       default: "---\n- sun\n- mon\n- tue\n- wed\n- thu\n- fri\n- sat\n"
  t.integer  "days_challenged"
end

数组看起来像这样:["2016-04-20", "2016-04-21", "2016-04-22", "2016-04-25", "2016-04-26"]

class Challenge < ActiveRecord::Base
  serialize :committed, Array

  def dates_challenged
    # Not sure if a model method is enough or if I'd have to migrate a new column
  end

  def committed_wdays
    committed.map do |day|    
      Date::ABBR_DAYNAMES.index(day.titleize)
    end
  end

  def days_left_challenged
    def days_done_challenged
      ((date_started.to_date)..Date.yesterday).count do |date| 
        committed_wdays.include? date.wday
      end
    end  
    if self.days_done_challenged >= self.days_challenged
      0
    else
      self.days_challenged - ((date_started.to_date)..Date.yesterday).count do |date| 
        committed_wdays.include? date.wday
      end
    end
  end
end

澄清一下，我正在尝试制作一个模型方法，这样我就可以做 @challenge.dates_challenged在一个 View 中，然后我可以在其中迭代日期数组。

Answer 1

这就是我想出的 - 仍然存在一些问题 - 我认为如果 committed 为空，它会爆炸，但它简洁明了:

def dates_challenged
  date = date_started-1
  days_challenge.times.map { date = find_next(date) }
end

private
def find_next(date)
  break if committed.include? Date::ABBR_DAYNAMES[date.wday].downcase while date = date.next
  date
end