代码重构-批量删除

need_fetch_channel.each do |channel|
    yesterday = (Time.now - 86000).to_i
    all_channel_videos = channel.videos.asc(:begin_time)
    all_channel_videos.each do |v| 
      if v.end_time < yesterday
        v.destroy
      end 
    end 
end

重构完

need_fetch_channel.videos.where(:end_time.lt => DateTime.yesterday.midnight).destroy_all

DateTime.yesterday.midnight 获取的是昨天的凌晨零点的时间