Ruby on rails webpacker 在 asset_pack_path 下找不到图片

问题描述

我在使用 Ruby on Rails Webpacker 在视图中包含图像时遇到问题.当我尝试使用 html img 标签和 asset_pack_path 在我的视图中插入图像时，出现错误.我的图片位于 app/javascript/images/logo.png.根据 webpacker 文档，我应该将/media/附加到文件中，但这无济于事.我尝试了不同的路径，但仍然无法正常工作.我认为 webpacker 不会编译我的图像.

I have a problem with including images in my views using Ruby on Rails Webpacker. When i try to insert image in my view using html img tag and asset_pack_path i got an error. My images is located in app/javascript/images/logo.png. According to webpacker docs i should append /media/ to file but it does not help. I try diffrent path but it's still not working. I think webpacker doesn't compile my image.

Webpacker::Manifest::MissingEntryError in Home#index
Showing app/views/layouts/application.html.haml where line #14 raised:

Webpacker can't find media/logo.png in 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:
{
  "application.js": "/packs/js/application-321d1c3bcc175b7f61a6.js",
  "application.js.map": "/packs/js/application-321d1c3bcc175b7f61a6.js.map",
  "entrypoints": {
    "application": {
      "js": [
        "/packs/js/application-321d1c3bcc175b7f61a6.js"
      ],
      "js.map": [
        "/packs/js/application-321d1c3bcc175b7f61a6.js.map"
      ]
    },
    "hello_react": {
      "js": [
        "/packs/js/hello_react-c48c89eaf873362b846b.js"
      ],
      "js.map": [
        "/packs/js/hello_react-c48c89eaf873362b846b.js.map"
      ]
    }
  },
  "hello_react.js": "/packs/js/hello_react-c48c89eaf873362b846b.js",
  "hello_react.js.map": "/packs/js/hello_react-c48c89eaf873362b846b.js.map"
}

在我看来 application.html.haml

!!! 5
%html
  %head
   = javascript_pack_tag 'application', 'data-turbolinks-track': 'reload'
    = stylesheet_pack_tag    'application'
  %body
    %nav.navbar.navbar-expand-lg.navbar-light.bg-primary
      %a.navbar-brand(href="/")
        %img(src="#{asset_pack_path 'media/logo.png'}")

app/javascript/packs/application.js

require.context('../images', true)

import 'bootstrap'
import './src/application.scss' 

Procfile.dev

web: bundle exec rails s
webpacker: ./bin/webpack-dev-server

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: []

  # 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
    - .mjs
    - .js
    - .sass
    - .scss
    - .css
    - .module.sass
    - .module.scss
    - .module.css
    - .png
    - .svg
    - .gif
    - .jpeg
    - .jpg

development:
  <<: *default
  compile: true

  # Verifies that versions and hashed value of the package contents in the project's package.json
  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: false

  # Extract and emit a css file
  extract_css: true

  # Cache manifest.json for performance
  cache_manifest: true

推荐答案

我的图片位于 /app/assets/images.

首先在webpacker.yml

然后你可以像这样在你的 JS 中使用图像:

And then you can use the image in your JS like so:

<img src='~images/logo.png'/>

在 CSS 中:

<style lang='sass'>
#app
  background: url('~images/logo.png')
</style>

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