Rails:Webpacker 4.2 在/app/public/packs/manifest.json heroku 中找不到应用程序 [英] Rails: Webpacker 4.2 can't find application in /app/public/packs/manifest.json heroku

问题描述

我有点不知所措.我的本地 Rails 应用程序与 webpacker 4.2 配合得很好并做出了反应，但是在部署到生产环境时给了我美妙的 can't find application in/app/public/packs/manifest.json 错误.

I'm a bit stumped. My local rails app works great with webpacker 4.2 and react, but when deploying to production gives me the wonderful can't find application in /app/public/packs/manifest.json error.

这是我尝试过的:

• 尝试添加/删除 javascript 包标签的 turbo 链接详细信息.
• 删除了 javascript 包含标记(不确定这是否有帮助)
• 确保我使用的是最新的 webpacker 4.2
• 运行耙子资产:clean &&rake assets:在 heroku 上手动预编译只是为了确保构建东西.

我是否遗漏了构建步骤或生产中会导致此问题的某些内容?还需要检查什么?

服务器错误:

2019-12-03T15:18:19.022024+00:00 app[web.1]: I, [2019-12-03T15:18:19.021952 #30]  INFO -- : [aa0374eb-bab1-40cc-b40b-6ae3d195e07d] Completed 500 Internal Server Error in 112ms (ActiveRecord: 30.4ms | Allocations: 21296)
2019-12-03T15:18:19.023103+00:00 app[web.1]: F, [2019-12-03T15:18:19.023029 #30] FATAL -- : [aa0374eb-bab1-40cc-b40b-6ae3d195e07d]
2019-12-03T15:18:19.023107+00:00 app[web.1]: [aa0374eb-bab1-40cc-b40b-6ae3d195e07d] ActionView::Template::Error (Webpacker can't find application in /app/public/packs/manifest.json. Possible causes:
2019-12-03T15:18:19.023109+00:00 app[web.1]: 1. You want to set webpacker.yml value of compile to true for your environment
2019-12-03T15:18:19.023111+00:00 app[web.1]: unless you are using the `webpack -w` or the webpack-dev-server.
2019-12-03T15:18:19.023114+00:00 app[web.1]: 2. webpack has not yet re-run to reflect updates.
2019-12-03T15:18:19.023116+00:00 app[web.1]: 3. You have misconfigured Webpacker's config/webpacker.yml file.
2019-12-03T15:18:19.023118+00:00 app[web.1]: 4. Your webpack configuration is not creating a manifest.
2019-12-03T15:18:19.023120+00:00 app[web.1]: Your manifest contains:

{
 "application.js": "/packs/js/application-2a0e2c932678ebbf2ae7.js",
"application.js.map": "/packs/js/application-2a0e2c932678ebbf2ae7.js.map",
"entrypoints": {
 "application": {
"js": [
"/packs/js/application-2a0e2c932678ebbf2ae7.js"
],
 "js.map": [
 "/packs/js/application-2a0e2c932678ebbf2ae7.js.map"
 ]
 },
 "server_rendering": {
 "js": [
 "/packs/js/server_rendering-eb794d024d4852e8ab55.js"
],
 "js.map": [
 "/packs/js/server_rendering-eb794d024d4852e8ab55.js.map"
 ]
}
 },
"server_rendering.js": "/packs/js/server_rendering-eb794d024d4852e8ab55.js",
"server_rendering.js.map": "/packs/js/server_rendering-eb794d024d4852e8ab55.js.map"
}

...

<%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
<%= stylesheet_pack_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
<%= javascript_pack_tag 'application' %>

<link href="https://fonts.googleapis.com/css?family=Open+Sans|Roboto+Slab:700&display=swap" rel="stylesheet">

2019-12-03T15:18:19.023193+00:00 app[web.1]: [aa0374eb-bab1-40cc-b40b-6ae3d195e07d] app/views/layouts/application.html.erb:10

Webpacker.yml

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: false

      # Additional paths webpack should lookup modules
      # ['app/assets', 'engine/foo/app/assets']
      resolved_paths: ['app/assets']

      # 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:
        - .jsx
        - .vue
        - .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
        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

推荐答案

看起来你的 manifest.json 中没有 application.css 这意味着你可能没有从 Webpack javascript 文件中导入任何 css.

It looks like there's no application.css in your manifest.json which means you might not be importing any css from within your Webpack javascript files.

如果这一切都是真的，那么您可以通过以下方法之一修复生产中的错误:

If that's all true, then you can fix the error in production by one of the following:

• 快速(临时)修复:将 extract_css: false 添加到 config/webpacker.yml 中的 production 块(这将模仿您的本地环境)
• 如果您不想使用 Webpacker 编译 css:从您的应用程序布局中删除 <%= stylesheet_pack_tag 'application' %>
• 如果你想用 Webpacker 编译一些 css:从你的 Webpack javascript 中导入至少一个 css 文件

• Quick (temporary) fix: Add extract_css: false to your production block in config/webpacker.yml (which would mimic your local environments)
• If you don't want to compile css with Webpacker: Remove <%= stylesheet_pack_tag 'application' %> from your application layout
• If you want to compile some css with Webpacker: Import at least one css file from your Webpack javascript

这篇关于Rails:Webpacker 4.2 在/app/public/packs/manifest.json heroku 中找不到应用程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！