基於年份和季度的日期範圍

Question

我有一個屬性quarter，我保存爲字符串形式 - "2015-1"，這意味着2015年和第一季度。

如何獲得此quarter內所有日期的範圍？

我需要將其納入驗證：

validates :date, 
    presence: true, 
    inclusion: { in: something_that_returns_the_range_from_quarter_attr } 

Answer 1

我會做這樣的：

#i would do the validation like so 
validates :date_in_quarter 

def date_in_quarter 
    if self.date.blank? || !self.quarter_date_range.include?(self.date) 
    self.errors.add(:date, "is blank or not in allowed range") 
    end 
end 

#the validation uses this method which gets date range from quarter attribute 
def quarter_date_range 
    year, quarter = self.quarter.split("-").collect(&:to_i) 
    start_month = ((3 * quarter) - 2) 
    start_date = Date.parse("#{year}-#{start_month}-01") 
    end_date = start_date + 3.months - 1.day 
    start_date..end_date 
end