ruby:自我从一个班级变为另一个班级

时间:2012-11-14 05:22:20

标签: ruby

以下代码有助于计算完成任务的营业时间。在calculate_deadline方法中,在BusinesHours类中,两个put语句显示了这个

 puts self
#<BusinessHours:0x000001008cbb70>

  puts self[start_time.to_date].inspect
#<TimeRange:0x000001008cbb48 @range=2010-06-10 09:00:00 -0700..2010-06-10 15:00:00 -0700>

我不明白为什么把start_time.to_date放在&#39; self&#39;在calculate_deadline中,将自我从BusinessHours类更改为TimeRange类,因为两个put语句建议,特别是因为&#39; to_date&#39;方法是类Time的一部分。你能解释一下这是怎么回事吗?

require 'time'
require 'date'

class Time
  def to_date
    Date.new(year, month, day)
  end
end

class BusinessHours

  def initialize(time_in, time_out)
    @default_range = TimeRange.new(time_in, time_out)
    @modified_days = {}
  end

  def update(day, time_in, time_out)
    key = day.is_a?(Symbol) ? day : Date.parse(day)
    @modified_days.merge!({key => TimeRange.new(time_in, time_out)})
  end

  def closed(*days)
    days.each {|day| update(day, '0:00', '0:00')}      
  end

  def [](date)
    day_of_week = date.strftime("%a").downcase.to_sym
    range = @modified_days[date] || @modified_days[day_of_week] || @default_range
    # reset time range dates to match date param
    range.reset_date(date)
    range
  end

  def calculate_deadline(seconds, start_time)
    start_time = Time.parse(start_time)
    puts self
    puts self[start_time.to_date].inspect
    range = self[start_time.to_date]


    if range.applies?(start_time)
      start_time = [start_time, range.start].max
      available_seconds = range.stop - start_time

      return start_time + seconds if available_seconds > seconds
      seconds -= available_seconds
    end

    calculate_deadline(seconds, (start_time.to_date + 1).to_s)
  end

end

class TimeRange

  def initialize(time_in, time_out)
    @range = Time.parse(time_in)..Time.parse(time_out)

  end

  def reset_date(date)
    @range = Time.local(date.year, date.month, date.day, start.hour, start.min)..
      Time.local(date.year, date.month, date.day, stop.hour, stop.min)    
  end

  def applies?(time)
    stop > time
  end

  def stop

    @range.end
  end

  def start
    @range.begin
  end

end

k = BusinessHours.new("9:00 AM", "3:00 PM")
k.calculate_deadline(20*60*60, "Jun 7, 2010 10:45 AM")

2 个答案:

答案 0 :(得分:2)

@default_range = TimeRange.new(time_in, time_out)

从该行开始,我们可以看到@default_rangeTimeRange个实例,而@modified_days是一个空哈希(因此@modified_days[anything]将为零,即falsey)

range = @modified_days[date] || @modified_days[day_of_week] || @default_range

由于@modified_days[anything]是假的,range最终会成为@default_range,正如我们上面所看到的那样,TimeRange是一个[]对象。 BusinessHours上的range方法会返回TimeRange变量,即self个对象。

因此,当BusinessHours[]对象时,当您调用self[argument]方法(TimeRange)时,您将获得{{1}}个对象。< / p>

答案 1 :(得分:0)

它不会改变您的self。您正在检查其他对象。

self.inspect       # inspecting 'self'.

self[date].inspect # inspecting 'self[date]'
                   # which returns a `TimeRange` object `range`.
                   # Hence, you are inspecting `range`.