如何对整数求和并将其转换为时间

Question

我有一个包含 has_many 首曲目的播放列表。每个轨道的持续时间都是以毫秒为单位的整数。我想计算播放列表的总持续时间。事实上，我从我的播放列表模型中制作了这样的东西：

  def total_tracks_duration
    seconds = tracks.sum(:duration) / 1000
    Time.at(seconds).strftime("%H:%M:%S")
  end

播放列表规范：

it '#total_tracks_duration' do
    play = build(:playlist)
    3.times do
        create(:track, playlist: play, duration: 60000)
    end

    expect(play.total_tracks_duration).to eq("00:03:00")
end

最后我遇到了这个失败：

    Failures:

  1) Playlist #total_tracks_duration
     Failure/Error: expect(play.total_tracks_duration).to eq("00:03:00")

       expected: "00:03:00"
            got: "01:00:00"

       (compared using ==)
     # ./spec/models/playlist_spec.rb:51:in `block (2 levels) in <top (required)>'

Finished in 0.69605 seconds (files took 9.83 seconds to load)
1 example, 1 failure

我哪里弄错了？

Answer 1

它为您的时区 (UTC+1) 添加了一个偏移量，所以只需这样做

Time.at(seconds).utc.strftime("%H:%M:%S")

它应该可以工作:)

如何对整数求和并将其转换为时间

How to sum integers and convert this to time

ruby-on-rails

ruby

time