我遵循本教程使用Rails引擎的webpacker：
http://ben.vandgrift.com/posts/rails-engine-webpacker-1/
基于此：
https://github.com/rails/webpacker/blob/5-x-stable/docs/engines.md
教程和github文档内容丰富，但我无法让我的主机应用程序包含来自引擎的javascript。我已经在本地克隆了教程中的repo(鞍袋是引擎的repo，鞍袋假人是主机应用程序(：
https://github.com/bvandgrift/saddlebag
https://github.com/bvandgrift/saddlebag-dummy
我所做的唯一修改是更新mimemagic-gem，因为该gem的指定版本是从gem源代码中提取的。
- mimemagic (0.3.5)
+ mimemagic (0.3.10)
+ nokogiri (~> 1)
+ rake
当我在主机应用程序目录中运行rails webpacker:compile时，它会生成以下内容：
Hash: 10b1522b0b9c4b8aca2d
Version: webpack 4.44.1
Time: 966ms
Built at: 05/03/2021 2:48:22 PM
Asset Size Chunks Chunk Names
js/application-cb05ac1ef9258bc6a611.js 52.7 KiB 0 [emitted] [immutable] application
js/application-cb05ac1ef9258bc6a611.js.br 11.3 KiB [emitted]
js/application-cb05ac1ef9258bc6a611.js.gz 12.8 KiB [emitted]
js/application-cb05ac1ef9258bc6a611.js.map 145 KiB 0 [emitted] [dev] application
js/application-cb05ac1ef9258bc6a611.js.map.br 31.9 KiB [emitted]
js/application-cb05ac1ef9258bc6a611.js.map.gz 36.7 KiB [emitted]
manifest.json 364 bytes [emitted]
manifest.json.br 127 bytes [emitted]
manifest.json.gz 142 bytes [emitted]
Entrypoint application = js/application-cb05ac1ef9258bc6a611.js js/application-cb05ac1ef9258bc6a611.js.map
[0] (webpack)/buildin/module.js 552 bytes {0} [built]
[1] ./app/javascript/packs/application.js 682 bytes {0} [built]
+ 2 hidden modules
以下是manifest.json文件的内容：
{
"application.js": "/packs/js/application-cb05ac1ef9258bc6a611.js",
"application.js.map": "/packs/js/application-cb05ac1ef9258bc6a611.js.map",
"entrypoints": {
"application": {
"js": [
"/packs/js/application-cb05ac1ef9258bc6a611.js"
],
"js.map": [
"/packs/js/application-cb05ac1ef9258bc6a611.js.map"
]
}
}
}
看起来webpacker正在运行，但不包括来自引擎的javascript。
试图点击计数器页面，我得到以下信息：
Webpacker在>中找不到counter.js/用户/fredwillmore/OtherDocuments/rails_projects/saddlebag/public/addlebag-packs/manifest.json。可能的原因：
- 您希望将compile的webpacker.yml值设置为true除非您使用的是
webpack -w或webpack dev服务器- webpack尚未重新运行以反映更新
- 您错误配置了Webpacker的config/Webpacker.yml文件
- 您的webpack配置没有创建清单。您的清单包含：{}
好的，没错，我在引擎中的清单文件是空的。所以我认为我需要编译/webpack/处理引擎中的javascript。现在正在尝试编译引擎代码。该引擎有一个在lib/tasks/saddlebag_tasks.rake中定义的rake任务saddlebag:webpacker:compile，但我无法运行它：
❯❯❯ rake saddlebag:webpacker:compile
rake aborted!
Don't know how to build task 'saddlebag:webpacker:compile' (See the list of available tasks with `rake --tasks`)
rake任务根本没有出现在rake --tasks:中
❯❯❯ rake --tasks
rake build # Build saddlebag-0.1.0.gem into the pkg directory
rake clean # Remove any temporary products
rake clobber # Remove any generated files
rake clobber_rdoc # Remove RDoc HTML files
rake install # Build and install saddlebag-0.1.0.gem into system gems
rake install:local # Build and install saddlebag-0.1.0.gem into system gems without network access
rake rdoc # Build RDoc HTML files
rake release[remote] # Create tag v0.1.0 and build and push saddlebag-0.1.0.gem to rubygems.org
rake rerdoc # Rebuild RDoc HTML files
rake stats # Report code statistics (KLOCs, etc) from the application or engine
所以我的问题是：如何在引擎中编译javascript，以便在主机应用程序中使用？
我也遇到了类似的问题。您需要在引擎上运行另一个webpack实例。
在开发bin/webpack-dev-server时(如果不存在，请添加它(。
注意，在部署时，你也需要在引擎上运行webpack，就像捆绑它一样。
set : your_engine_path, 'some/path/to/your_engine'
task :install_engine do
on roles(:app) do
with rails_env: fetch(:rails_env) do
within "#{release_path}/#{fetch(:your_engine_path)}" do
execute :bundle, 'install --path vendor/bundle'
end
end
end
end
namespace :webpacker do
desc 'Install deps with yarn'
task :yarn_install do
on roles(:app) do
within "#{release_path}/#{fetch(: your_engine_path)}" do
execute 'yarn'
end
end
end
desc 'Compile JavaScript packs using webpack for production with digests'
task :compile do
on roles(:app), in: :sequence, wait: 5 do
within release_path do
with rails_env: fetch(:rails_env) do
execute :bundle, 'exec rake your_engine:compile_assets'
end
end
end
end
before :compile, :yarn_install
end