Ruby on rails 如何调试Heroku上的“错误检测资产：预编译任务”问题

当推到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，但不会有任何资产

这令人难以置信地沮丧，因为没有出现错误，我们也不知道会发生什么。日志没有任何提示

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

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

以下是整个推送过程中完整的书面记录输出：

       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

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，我们什么也没学到

---

在Heroku编译过程中，我们可以做些什么来调试错误？

我想知道为什么Heroku会启动WEBrick…无论如何，你的应用程序是否正常工作？它说它的状态是上升的。您的Procfile看起来像什么？Heroku通常非常擅长在编译过程中吐出错误。你应该可以看到你推送到heroku master的日志。另外，看看这个@Leo-Per链接，我们并没有试图清除任何默认的rake任务，所以不要认为这个解决方案会apply@Leo-我更新了我的问题-该应用程序实际上一直工作，只是从来没有资产。根据其他事项：我没有使用procfile，Heroku默认启动WEBrick，并且日志中没有任何内容-这就是问题所在。当运行Heroku运行rake-T时，您看到rake任务了吗？