## 概要

Docker + Rails6系 +
TailwindCSSバージョン3でアプリを作成しているのですが、TailwindCSSのスタイルの反映がうまくいかないので相談させてください。

## 実現したいこと

index.html.erbにて、新しいTailwindのクラスを追加した際に即時スタイルを反映したい。

## 発生している問題

例えば、現在のindex.html.erbが以下のソースコードの場合、

```

    # index.html.erb
    
    <h1 class="text-3xl font-bold underline text-orange-700">
      Hello world!
    </h1>
    
    <p class="text-orange-200">The quick brown fox...</p>
    <p class="text-purple-600">i have a dream</p>
    
```

localhost:3000を開くと以下のように、「i have a dream」にtext-
purple-600が反映されていません。リロードをしたとしても、反映されません。

[![画像の説明をここに入力](https://i.stack.imgur.com/MQL5D.png)](https://i.stack.imgur.com/MQL5D.png)

しかし、なぜかtailwind.config.jsファイルのcontentの箇所を以下の状態から、

```

    # tailwind.config.js
    
    module.exports = {
      content: ["./app/**/*.{html,js,erb,rb}"],
      theme: {
        extend: {},
      },
      plugins: [],
    };
    
```

以下の状態にすると

```

    # tailwind.config.js
    
    module.exports = {
      content: ["./app/**/**/*.{html,js,erb,rb}"], 
      theme: {
        extend: {},
      },
      plugins: [],
    };
    
```

以下の画像のようにスタイルが反映されます。  
[![画像の説明をここに入力](https://i.stack.imgur.com/JUkE4.png)](https://i.stack.imgur.com/JUkE4.png)

また、この状態でindex.html.erbの一番下に新しくcolor green

を追加すると、

```

    # index.html.erb
    
    <h1 class="text-3xl font-bold underline text-orange-700">
      Hello world!
    </h1>
    
    <p class="text-orange-200">The quick brown fox...</p>
    <p class="text-purple-600">i have a dream</p>
    <p class="text-green-600">color green</p>
    
```

以下のようにスタイルは反映されません。  
[![画像の説明をここに入力](https://i.stack.imgur.com/vJJjG.png)](https://i.stack.imgur.com/vJJjG.png)

ここからtailwind.config.jsファイルのcontentの状態を、以下のように一番はじめの状態に戻してリロードすると、

```

    # tailwind.config.js
    
    module.exports = {
      content: ["./app/**/*.{html,js,erb,rb}"],
      theme: {
        extend: {},
      },
      plugins: [],
    };
    
```

[![画像の説明をここに入力](https://i.stack.imgur.com/LwlHV.png)](https://i.stack.imgur.com/LwlHV.png)

スタイルが反映されます。

なぜtailwind.config.jsファイルのcontentの状態を毎回修正したり、元に戻したりしないとスタイルが反映されないのでしょうか？

## 関連ファイルの状態

その他関連ファイルは以下のようになっています。

```

    # application.html.erb
    
    <!DOCTYPE html>
    <html>
    
    <head>
      <title>Myapp</title>
      <%= csrf_meta_tags %>
      <%= csp_meta_tag %>
    
      <%= stylesheet_pack_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
      <%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
    </head>
    
    <body>
      <%= yield %>
    </body>
    
    </html>
    app/javascript/stylesheets/application.css
    
```

```

    # app/javascript/stylesheets/application.css
    
    @tailwind base;
    @tailwind components;
    @tailwind utilities;
    
```

```

    # app/javascript/packs/application.js
    
    // This file is automatically compiled by Webpack, along with any other files
    // present in this directory. You're encouraged to place your actual application logic in
    // a relevant structure within app/javascript and only use these pack files to reference
    // that code so it'll be compiled.
    
    require("@rails/ujs").start();
    require("turbolinks").start();
    require("@rails/activestorage").start();
    require("channels");
    import "../stylesheets/application.css";
    
    // Uncomment to copy all static images under ../images to the output folder and reference
    // them with the image_pack_tag helper in views (e.g <%= image_pack_tag 'rails.png' %>)
    // or the `imagePath` JavaScript helper below.
    //
    // const images = require.context('../images', true)
    // const imagePath = (name) => images(name, true)
    
```

```

    # postcss.config.js
    
    module.exports = {
      plugins: [
        require("postcss-import"),
        require("postcss-flexbugs-fixes"),
        require("tailwindcss")("./app/javascript/stylesheets/tailwind.config.js"),
        require("autoprefixer"),
        require("postcss-preset-env")({
          autoprefixer: {
            flexbox: "no-2009",
          },
          stage: 3,
        }),
      ],
    };
    
```

```

    # package.json
    
    {
      "name": "myapp",
      "private": true,
      "dependencies": {
        "@rails/actioncable": "^6.0.0",
        "@rails/activestorage": "^6.0.0",
        "@rails/ujs": "^6.0.0",
        "@rails/webpacker": "^5.4.3",
        "autoprefixer": "^9",
        "postcss": "^8.4.13",
        "tailwindcss": "^3.0.24",
        "turbolinks": "^5.2.0"
      },
      "version": "0.1.0",
      "devDependencies": {
        "@webpack-cli/serve": "^1.6.1",
        "webpack-dev-server": "~3"
      }
    }
    
```

```

    # docker-compose.yml
    
    version: "3"
    services:
      webpack:
        build: .
        volumes:
          - .:/myapp
          - gem_data:/usr/local/bundle
        environment:
          NODE_ENV: development
          RAILS_ENV: development
          WEBPACKER_DEV_SERVER_HOST: 0.0.0.0
        command: bash -c "bin/webpack-dev-server"
        ports:
          - '3035:3035'
      db:
        image: mysql:8.0
        volumes:
          - ./tmp/db:/var/lib/mysql
        environment:
          MYSQL_ROOT_PASSWORD: password
        ports:
            - "4306:3306"
      web:
        build: .
        command: bash -c "rm -f tmp/pids/server.pid &&  bundle exec rails s -p 3000 -b '0.0.0.0'"
        stdin_open: true
        tty: true
        volumes:
          - .:/myapp
          - gem_data:/usr/local/bundle
        ports:
          - "3000:3000"
        depends_on:
          - db
        environment:
          WEBPACKER_DEV_SERVER_HOST: webpack
    volumes:
      mysql_data:
      gem_data:
    
```

```

    # app/assets/stylesheets/application.css
    
    /*
     * This is a manifest file that'll be compiled into application.css, which will include all the files
     * listed below.
     *
     * Any CSS and SCSS file within this directory, lib/assets/stylesheets, or any plugin's
     * vendor/assets/stylesheets directory can be referenced here using a relative path.
     *
     * You're free to add application-wide styles to this file and they'll appear at the bottom of the
     * compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
     * files in this directory. Styles in this file should be added after the last require_* statement.
     * It is generally better to create a new file per style scope.
     *
     *= require_tree .
     *= require_self
     */
    
```

```

    # webpacker.yml
    
    # Note: You must restart bin/webpack-dev-server for changes to take effect
    
    default: &default
      source_path: app/javascript
      source_entry_path: packs
      public_root_path: public
      public_output_path: packs
      cache_path: tmp/cache/webpacker
      check_yarn_integrity: false
      webpack_compile_output: true
    
      # Additional paths webpack should lookup modules
      # ['app/assets', 'engine/foo/app/assets']
      resolved_paths: []
    
      # Reload manifest.json on all requests so we reload latest compiled packs
      cache_manifest: false
    
      # Extract and emit a css file
      extract_css: false
    
      static_assets_extensions:
        - .jpg
        - .jpeg
        - .png
        - .gif
        - .tiff
        - .ico
        - .svg
        - .eot
        - .otf
        - .ttf
        - .woff
        - .woff2
    
      extensions:
        - .mjs
        - .js
        - .sass
        - .scss
        - .css
        - .module.sass
        - .module.scss
        - .module.css
        - .png
        - .svg
        - .gif
        - .jpeg
        - .jpg
    
    development:
      <<: *default
      compile: true
    
      # Verifies that correct packages and versions are installed by inspecting package.json, yarn.lock, and node_modules
      check_yarn_integrity: true
    
      # Reference: https://webpack.js.org/configuration/dev-server/
      dev_server:
        https: false
        host: localhost
        port: 3035
        public: localhost:3035
        hmr: false
        # Inline should be set to true if using HMR
        inline: true
        overlay: true
        compress: true
        disable_host_check: true
        use_local_ip: false
        quiet: false
        pretty: false
        headers:
          "Access-Control-Allow-Origin": "*"
        watch_options:
          ignored: "**/node_modules/**"
    
    test:
      <<: *default
      compile: true
    
      # Compile test packs to a separate directory
      public_output_path: packs-test
    
    production:
      <<: *default
    
      # Production depends on precompilation of packs prior to booting for performance.
      compile: true
    
      # Extract and emit a css file
      extract_css: true
    
      # Cache manifest.json for performance
      cache_manifest: true
    
```
CC BY-SA 4.0
2022-05-17T18:44:41.680
88888
2022-06-09T05:59:27.317
2022-05-19T08:57:08.830
52671
52671
question
ruby-on-rails docker-compose tailwindcss
Docker + Rails6系 + TailwindCSSバージョン3で、TailwindCSSのスタイルの反映がうまくいかない
`tailwindcss-rails`というgemをご使用でしょうか？  
もし使っていたら、いつも`rails s`で起動するところを`./bin/dev`で起動するようにすると正常に動作するかもしれません
CC BY-SA 4.0
2022-06-06T00:17:55.540
89248
2022-06-06T00:17:55.540
23067
88888
answer