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[解決済み] ウェブパッカーがアプリケーションを見つけ出せない

2022-02-04 04:56:08

質問

Getting Started with Rails"に従って、新しいrailsアプリケーションを作成しています。アプリケーションはステップ4.1で正常に起動します。しかし、最初のコントローラを作成するときに、webpackエラーが発生しました。

私はwebpackの初心者で、すべてのドキュメントを読みましたが、何が間違っているか、何が欠けているのか理解できません...

  • Windows 10 1903
  • ルビー2.6
  • レイルズ 6.0.0
  • nodeJS 12.11.0 
rails webpacker:install
   identical  config/webpacker.yml
Copying webpack core config
       exist  config/webpack
   identical  config/webpack/development.js
   identical  config/webpack/environment.js
   identical  config/webpack/production.js
   identical  config/webpack/test.js
Copying postcss.config.js to app root directory
   identical  postcss.config.js
Copying babel.config.js to app root directory
   identical  babel.config.js
Copying .browserslistrc to app root directory
   identical  .browserslistrc
The JavaScript app source directory already exists
       apply  C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/install/binstubs.rb
  Copying binstubs
       exist    bin
   identical    bin/webpack
   identical    bin/webpack-dev-server
      append  .gitignore
Installing all JavaScript dependencies [4.0.7]
         run  yarn add @rails/webpacker from "."
yarn add v1.17.3
[1/4] Resolving packages...
[2/4] Fetching packages...
info [email protected]: The platform "win32" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning " > [email protected]" has unmet peer dependency "webpack@^4.0.0".
warning "webpack-dev-server > [email protected]" has unmet peer dependency "webpack@^4.0.0".
[4/4] Building fresh packages...
success Saved 1 new dependency.
info Direct dependencies
└─ @rails/[email protected]
info All dependencies
└─ @rails/[email protected]
Done in 4.48s.
Installing dev server for live reloading
         run  yarn add --dev webpack-dev-server from "."
yarn add v1.17.3
[1/4] Resolving packages...
[2/4] Fetching packages...
info [email protected]: The platform "win32" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning "webpack-dev-server > [email protected]" has unmet peer dependency "webpack@^4.0.0".
warning " > [email protected]" has unmet peer dependency "webpack@^4.0.0".
[4/4] Building fresh packages...
success Saved 1 new dependency.
info Direct dependencies
└─ [email protected]
info All dependencies
└─ [email protected]
Done in 4.92s.
Webpacker successfully installed �????????????


Webpacker::Manifest::MissingEntryError in Welcome#index

Showing C:/Users/[...]/site_test/app/views/layouts/application.html.erb where line #9 raised:

Webpacker can't find application in C:/Users/[...]/site_test/public/packs/manifest.json. Possible causes:
1. You want to set webpacker.yml value of compile to true for your environment
   unless you are using the `webpack -w` or the webpack-dev-server.
2. webpack has not yet re-run to reflect updates.
3. You have misconfigured Webpacker's config/webpacker.yml file.
4. Your webpack configuration is not creating a manifest.
Your manifest contains:
{
}

Extracted source (around line #9):

7
8      <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
9      <%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
10 </head>
11 <body>
12

解決方法は？

お世話になります。残念ながら、何の効果もありません。

rails assets:clobber 戻る error 整合性ファイルが見つかりません" node_modules フォルダを削除した直後。(yarn install --check-files の後はうまくいきます)。

そして rails assets:precompile 戻る 

"C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/webpack_runner.rb:23:in `exec': No such file or directory - C:\Users\[...]\site_test\node_modules\.bin/webpack (Errno::ENOENT)"

しかし、何が問題だったのかがわかりました。 おそらく名前の問題でしょう．

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