Ruby，创建数组的时间与当前时间之间的差异

Question

我正在尝试获取创建数组的时间与当前时间之间的差异，我似乎无法理解它，我这样做了，这似乎完全合乎逻辑，但似乎并不永远工作。

mergelisting = MergeList.Pluck(:created_at, :partner, :gambler, :amount)
  (mergelisting).each do |i|
    t = Time.now
    nowtime = t.strftime("%I")
    nowtime.to_i
    mergetime = i[1].strftime("%I")
    mergetime.to_i
    if nowtime - mergetime == 6
      do some stuff...
    end
  end

我真正的问题是 24 和 6 之间的小时差是 6 小时，但是 24-6 不会给 6。我可以在这里做什么

Answer 1

我假设 MergeList.Pluck returns 一个 Array，并且此数组中的第一项将是数据库中的 Rails created_at 列.那么：

mergelisting = MergeList.Pluck(:created_at, :partner, :gambler, :amount)

mergetime  = mergelisting.first           # Time from DB (created_at)
nowtime    = Time.now                     # Current time
timediff_s = nowtime - mergetime          # Difference in seconds
timediff_h = timediff_s / (60 * 60).to_f  # Difference in hours as a floating point number

#
# Not exactly sure if this is what you wanted, but you now
# have the time difference as a floating point number expressed
# in hours. So you can do whatever you want with it
#
if (timediff_h.to_i == 6)
  ...the difference is anywhere between 6.0 and 7.0 hours...
  ...do whatever you need to do...
end

Ruby，创建数组的时间与当前时间之间的差异

Ruby, difference between time an array was created and the current time

ruby

rake

ruby-on-rails