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")
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_range
是TimeRange
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
为[]
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`.