ruby - unicorn的配置如何依環境分開多個pid？

Question

比如unicorn的配置文件（config/unicorn.rb）中默認這樣寫：

listen "/tmp/myapp/unicorn.sock", backlog: 1
pid "/tmp/myapp/unicorn.pid"

要根據實際運行環境和測試環境區分開，想這樣實現：

if ENV["RAILS_ENV"] == "production"
  listen "/tmp/myapp/unicorn.sock", backlog: 1
  pid "/tmp/myapp/unicorn.pid"
else
  listen "/tmp/myapp/test.sock", backlog: 1
  pid "/tmp/myapp/test.pid"
end

卻不能達到目的，有沒有可行方法？