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推送到 Heroku 时，我们在输出中看到以下行：

...
Error detecting the assets:precompile task
...

然后应用程序将成功部署，但它不会有任何资产。

这非常令人沮丧，因为没有引发错误，而且我们不知道可能发生了什么。日志没有暗示任何事情。

这是推送的终端输出的尾部：

       Your bundle is complete! It was installed into ./vendor/bundle
       Cleaning up the bundler cache.
-----> Writing config/database.yml to read from DATABASE_URL
       Error detecting the assets:precompile task
-----> Discovering process types
       Procfile declares types      -> (none)
       Default types for Ruby/Rails -> console, rake, web, worker

-----> Compiled slug size: 54.8MB
-----> Launching... done, v15
       http://myapp-1234.herokuapp.com deployed to Heroku

这是整个推送过程中完整的 papertrail 日志输出：

Sep 29 09:07:32 myapp-1234 heroku/slug-compiler:  Slug compilation started 
Sep 29 09:07:54 myapp-1234 heroku/api:  Release v15 created by me@example.com 
Sep 29 09:07:56 myapp-1234 heroku/slug-compiler:  Slug compilation finished 
Sep 29 09:08:00 myapp-1234 heroku/web.1:  Process exited with status 143 
Sep 29 09:08:00 myapp-1234 heroku/web.1:  Starting process with command `bin/rails server -p 18025 -e staging` 
Sep 29 09:08:04 myapp-1234 app/web.1:  [2013-09-29 16:08:04] INFO  WEBrick 1.3.1 
Sep 29 09:08:05 myapp-1234 app/web.1:  [2013-09-29 16:08:04] INFO  ruby 2.0.0 (2013-06-27) [x86_64-linux] 
Sep 29 09:08:05 myapp-1234 app/web.1:  [2013-09-29 16:08:04] INFO  WEBrick::HTTPServer#start: pid=2 port=18025 
Sep 29 09:08:05 myapp-1234 heroku/web.1:  State changed from starting to up

太好了——我们什么都没学到。

在 Heroku 编译期间我们可以做些什么来调试错误？

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