如何在Heroku中運行rails控制檯？ Rails 5.1和postgresql

Question

我一直在跟着一個Rails應用程序的教程。本教程基於Rails 5，我正在使用Rails 5.1.2。一切都在本地很好，並推向英雄沒有問題。然而，當我去運行，以創建生產數據庫管理員用戶：

​​3210

它返回以下錯誤：

/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:292:in require': cannot load such file -- rack/handler/c (LoadError) from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:292:in block in require' from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:258:in load_dependency' from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:292:in require' from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.3/lib/rack/handler.rb:74:in try_require' from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.3/lib/rack/handler.rb:16:in get' from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.3/lib/rack/server.rb:301:in server' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:68:in print_boot_information' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:38:in start' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:131:in block in perform' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:126:in tap' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:126:in perform' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/command.rb:27:in run' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in invoke_command' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:in dispatch' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/command/base.rb:63:in perform' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/command.rb:44:in invoke' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands.rb:16:in ' from bin/rails:9:in require' from bin/rails:9:in '`

爲了解決這個問題，我可以運行：

$ heroku run bash 
$ rails c 

這使我可以更新生產數據庫。雖然這工作，並得到我所需要的。我想知道爲什麼原始命令不起作用。我到處尋找答案，不能拿出任何適用於我的東西。我正在努力提高自己的開發技能，並希望理解爲什麼原始問題不起作用。

我可以添加任何人需要查看的文件，但我甚至不知道哪個文件與這個問題有關。

Answer 1

我的理解是，heroku run命令由Heroku命令行界面（CLI）提供。 CLI不知道如何處理rails c命令。然而，運行heroku run bash將啓動一個新的dyno並提供對Unix shell的訪問，在那裏你可以運行命令（即rails c），就像你是本地終端一樣。欲瞭解更多信息，請參閱：https://devcenter.heroku.com/articles/how-heroku-works。

編輯，以修復錯誤：在CLI不知道如何處理的rails c命令