抑制 Rake 任务 db:schema:load 中的输出 [英] Suppress Output in Rake Task db:schema:load

问题描述

如何抑制 db:load:schema 的输出?运行

How can you suppress the output of db:load:schema? Running

bundle exec rake db:schema:load

使用 -s、-q 甚至 VERBOSE=false 选项对输出没有影响；出现了我不想看到的相同create_table ... add_index ..."垃圾.我从自定义 Rake 任务中调用它，我不希望用户每次都看到所有这些.

with the -s, -q, or even VERBOSE=false options makes no difference in the output; the same "create_table... add_index..." garbage that I don't want to see appears. I'm invoking this from inside a custom Rake task and I don't want the user to see all of this every time.

更新:

我使用@Deefour 的一些指导解决了这个问题:

I solved the problem with some guidance from @Deefour by using:

system "bundle exec rake db:schema:load -s RAILS_ENV=#{Rails.env} >NUL"

>NUL 适用于 Windows 机器，基于 Unix 的可以使用 >/dev/null.

>NUL is for Windows machines, Unix-based can use > /dev/null.

而不是

Rake::Task['db:schema:load'].invoke

就像我在自定义任务中所做的那样.请注意，此解决方案特定于 Windows 机器.对于基于 Unix 的机器，我想您应该能够使用下面接受的解决方案.

as I had been doing in my custom task. Note that this solution is specific to Windows machines. For Unix-based machines I imagine you should be able to use the accepted solution below.

推荐答案

这里有一个更简洁的跨系统解决方案:

Here is a cleaner solution that works cross-system:

silence_stream(STDOUT) do
  # anything written to STDOUT here will be silenced
  Rake::Task["db:schema:load"].invoke
end

还有

quietly do
  # anything written to STDOUT or STDERR here will be silenced
  Rake::Task["db:schema:load"].invoke
end

我更喜欢 silence_stream(STDOUT) 而不是 quietly 因为它仍然允许显示写入 STDERR 的错误消息，这会很有帮助当 rake 命令开始起作用时.

I prefer silence_stream(STDOUT) toquietly because it will still allow error messages written to STDERR to be shown, which will be helpful when the rake command starts to act up.

参考:silence_stream、silence_warnings, &安静

References: silence_stream, silence_warnings, & quietly

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