如果百分比发生变化，我该如何才能进行此展示？

Question

我被困在这里：

puts "#{percent_finished.round}% uploading complete" ? if/unless ...

Answer 1

如果percent_finished是ActiveRecord模型的一部分，您实际上只需拨打percent_finished_changed?即可。

例如：

puts "#{percent_finished.round}% uploading complete" if percent_finished_changed?

以下是一些文档：

http://ar.rubyonrails.org/classes/ActiveRecord/Dirty.html

Answer 2

这是一个命令行工具吗？

last_percent = nil
upload_loop do
    # ...
    percent_rounded = percent_finished.round
    puts "#{percent_rounded}% uploading complete" if percent_rounded != last_percent
    last_percent = percent_rounded
end