在看了一些教程之后，我发现了哪些链轮不能拆卸。
虽然我升级我删除了很多宝石，有人进口链轮作为一个依赖。
我修复了直接添加链轮的问题：

gem "sprockets-rails", :require => "sprockets/railtie"

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我还简化了assets.rb文件：

# Be sure to restart your server when you modify this file.

# Version of your assets, change this if you want to expire all your assets.
Rails.application.config.assets.version = "1.0"

# Add additional assets to the asset load path.
# Rails.application.config.assets.paths << Emoji.images_path
Rails.application.config.assets.paths << Rails.root.join("node_modules/bootstrap-icons/font")
Rails.application.config.assets.paths << Rails.root.join("node_modules/@fortawesome/fontawesome-free/webfonts")
Rails.application.config.assets.paths << Rails.root.join("node_modules/summernote/dist/font")
Rails.application.config.assets.paths << Rails.root.join("app/assets/fonts")

# Rails.application.config.assets.precompile << /\.(?:svg|eot|woff|ttf)\z/

# Precompile additional assets.
# application.js, application.css, and all non-JS/CSS in the app/assets
# folder are already added.
# Rails.application.config.assets.precompile += %w( admin.js admin.css )

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从代码中搜索使用.assets的其他文件很重要。
我的manifest.js文件（链轮查找该文件）：

//= link_tree ../images
//= link_tree ../builds

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参考资料：

https://www.youtube.com/watch?v=h8DmZhkRoJs
https://www.youtube.com/watch?v=DhM-Wh9Pmd4的