Sprockets :: Rails :: Helper :: AssetNotFound-资产管道中不存在资产“ my_logo.jpeg”

收到此错误后，我缺少什么？

Sprockets::Rails::Helper::AssetNotFound in Static#index:

The asset "my_logo.jpg" is not present in the asset pipeline.

ActionView::Template::Error (The asset "my_logo.jpg" is not present in the asset pipeline.):
    1: <%= image_tag "my_logo.jpg" %>

1. 我制作了一个新的Ruby on Rails应用程序rails new my_app＃Rails 6.0.3.2

2. 允许它安装gems，web packer等。

3. 添加config.assets.compile = false到config/environments/development.rb

4. 添加具有此内容的静态控制器和索引文件

   应用程序/控制器/static_controller.r b

   class StaticController < ApplicationController
     def index
       render :index, layout: false
     end
   end
   

   app / views / static / index.html.erb

   <%= image_tag "my_logo.jpg" %>
   

5. 将my_logo.jpeg文件添加到 app/assets/images/

   wget https://jpeg.org/images/jpeg2000-home.jpg -O app/assets/images/my_logo.jpg
   

6. 预编译资产： bundle exec rake assets:precompile

7. 将Rails服务器运行为： bundle exec rails server

我可以看到文件的public/assets/名称如下：my_logo-484af9fb82bc8a0279ef38b527402b5697475bd8f827251f46fbb182be6c07a1.jpg

如果将其设置为true，它将显示图像很好： config.assets.compile = true

清单文件的内容也来自 public/assets/.sprockets-manifest-a7f9f10978778e828273bf0c790645f6.json

{
  "files": {
    "manifest-b4bf6e57a53c2bdb55b8998cc94cd00883793c1c37c5e5aea3ef6749b4f6d92b.js": {
      "logical_path": "manifest.js",
      "mtime": "2020-06-28T03:59:01+00:00",
      "size": 2,
      "digest": "75a11da44c802486bc6f65640aa48a730f0f684c5c07a42ba3cd1735eb3fb070",
      "integrity": "sha256-daEdpEyAJIa8b2VkCqSKcw8PaExcB6Qro80XNes/sHA="
    },
    "application-b324c44f04a0d0da658824105489a2676d49df561c3d06723770321fd441977c.css": {
      "logical_path": "application.css",
      "mtime": "2020-06-28T03:59:01+00:00",
      "size": 675,
      "digest": "4998ce12ecefa6ba42de36e4beac458527529608f8cf0fe6c97acd87850045e4",
      "integrity": "sha256-SZjOEuzvprpC3jbkvqxFhSdSlgj4zw/myXrNh4UAReQ="
    },
    "my_logo-484af9fb82bc8a0279ef38b527402b5697475bd8f827251f46fbb182be6c07a1.jpg": {
      "logical_path": "my_logo.jpg",
      "mtime": "2020-06-28T03:59:01+00:00",
      "size": 20974,
      "digest": "acda9fe5166e93aef6ef9572c07e9a6bf3f4879180765b3d95d9a631b852191c",
      "integrity": "sha256-rNqf5RZuk67275VywH6aa/P0h5GAdls9ldmmMbhSGRw="
    }
  },
  "assets": {
    "manifest.js": "manifest-b4bf6e57a53c2bdb55b8998cc94cd00883793c1c37c5e5aea3ef6749b4f6d92b.js",
    "application.css": "application-b324c44f04a0d0da658824105489a2676d49df561c3d06723770321fd441977c.css",
    "my_logo.jpg": "my_logo-484af9fb82bc8a0279ef38b527402b5697475bd8f827251f46fbb182be6c07a1.jpg"
  }
}

另外，我还打开config.assets.unknown_asset_fallback = true了路径，发现它是存在的：http://localhost:3000/images/my_logo.jpg当它为假时（当它起作用时），我得到了以下路径：http://localhost:3000/assets/my_logo-484af9fb82bc8a0279ef38b527402b5697475bd8f827251f46fbb182be6c07a1.jpg