获取在Rails / Turbo / Hotwire中工作的简单示例时出错

Question

我正在学习Hotwire-rails，遵循gorails.com和Hotwire.dev示例。我运行的是Ruby 3.0.2和Rails 6.1.4.1。症状是从一开始就出现的。在rails new xxx之后，我编辑Gemfile添加gem 'hotwire-rails'，然后捆绑安装。此时，我的app/javascript/packs/application.js现在是：

cat app/javascript/packs/application.js 
// This file is automatically compiled by Webpack, along with any other files
// present in this directory. You're encouraged to place your actual application logic in
// a relevant structure within app/javascript and only use these pack files to reference
// that code so it'll be compiled.

import Rails from "@rails/ujs"
import Turbolinks from "turbolinks"
import * as ActiveStorage from "@rails/activestorage"
import "channels"

Rails.start()
Turbolinks.start()
ActiveStorage.start()

所以这看起来没问题。然后是rails Hotwire:install。下面是我所看到的(错误消息以红色显示)。就好像它找不到文件一样。

/mydev/public_samples/rails/hotwire_error (master) rails hotwire:install
Create controllers directory
      create  app/javascript/controllers
      create  app/javascript/controllers/index.js
      create  app/javascript/controllers/application.js
      create  app/javascript/controllers/hello_controller.js
You must import "./controllers" in your JavaScript entrypoint
Install Stimulus
         run  yarn add @hotwired/stimulus from "."
yarn add v1.22.10
[1/4] ?  Resolving packages...
[2/4] ?  Fetching packages...
[3/4] ?  Linking dependencies...
[4/4] ?  Building fresh packages...
success Saved lockfile.
success Saved 1 new dependency.
info Direct dependencies
└─ @hotwired/stimulus@3.0.1
info All dependencies
└─ @hotwired/stimulus@3.0.1
✨  Done in 3.00s.
You must import @hotwired/turbo-rails in your JavaScript entrypoint file
Install Turbo
         run  yarn add @hotwired/turbo-rails from "."
yarn add v1.22.10
[1/4] ?  Resolving packages...
[2/4] ?  Fetching packages...
[3/4] ?  Linking dependencies...
[4/4] ?  Building fresh packages...
success Saved lockfile.
success Saved 2 new dependencies.
info Direct dependencies
└─ @hotwired/turbo-rails@7.0.1
info All dependencies
├─ @hotwired/turbo-rails@7.0.1
└─ @hotwired/turbo@7.0.1
✨  Done in 3.73s.
Enable redis in bundle
        gsub  Gemfile
         run  bundle install
Fetching gem metadata from https://rubygems.org/............
Resolving dependencies...
Using rake 13.0.6
Using concurrent-ruby 1.1.9
Using minitest 5.14.4
Using zeitwerk 2.5.1
Using builder 3.2.4
Using erubi 1.10.0
Using racc 1.6.0
Using crass 1.0.6
Using rack 2.2.3
Using nio4r 2.5.8
Using websocket-extensions 0.1.5
Using marcel 1.0.2
Using mini_mime 1.1.2
Using public_suffix 4.0.6
Using bindex 0.8.1
Using msgpack 1.4.2
Using bundler 2.2.23
Using byebug 11.1.3
Using matrix 0.4.2
Using regexp_parser 2.1.1
Using childprocess 4.1.0
Using ffi 1.15.4
Using method_source 1.0.0
Using thor 1.1.0
Using rb-fsevent 0.11.0
Using redis 4.5.1
Using rexml 3.2.5
Using rubyzip 2.3.2
Using tilt 2.0.10
Using semantic_range 3.0.0
Using spring 3.0.0
Using sqlite3 1.4.2
Using turbolinks-source 5.2.0
Using i18n 1.8.11
Using tzinfo 2.0.4
Using nokogiri 1.12.5 (x86_64-darwin)
Using rack-test 1.1.0
Using websocket-driver 0.7.5
Using mail 2.7.1
Using addressable 2.8.0
Using bootsnap 1.9.1
Using sprockets 4.0.2
Using rb-inotify 0.10.1
Using puma 5.5.2
Using rack-mini-profiler 2.3.3
Using rack-proxy 0.7.0
Using sassc 2.4.0
Using selenium-webdriver 4.0.3
Using turbolinks 5.2.1
Using activesupport 6.1.4.1
Using loofah 2.12.0
Using xpath 3.2.0
Using listen 3.7.0
Using webdrivers 5.0.0
Using rails-dom-testing 2.0.3
Using rails-html-sanitizer 1.4.2
Using globalid 0.5.2
Using activemodel 6.1.4.1
Using capybara 3.36.0
Using jbuilder 2.11.2
Using actionview 6.1.4.1
Using activejob 6.1.4.1
Using activerecord 6.1.4.1
Using actionpack 6.1.4.1
Using actioncable 6.1.4.1
Using activestorage 6.1.4.1
Using actionmailer 6.1.4.1
Using railties 6.1.4.1
Using sprockets-rails 3.2.2
Using actionmailbox 6.1.4.1
Using actiontext 6.1.4.1
Using sassc-rails 2.1.2
Using web-console 4.1.0
Using webpacker 5.4.3
Using rails 6.1.4.1
Using sass-rails 6.0.0
Using turbo-rails 0.8.3
Using stimulus-rails 0.7.2
Using hotwire-rails 0.1.3
Bundle complete! 19 Gemfile dependencies, 79 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
Switch development cable to use redis
        gsub  config/cable.yml

请特别注意两个错误:必须在JavaScript入口点中导入"./controllers“，并且必须在JavaScript入口点文件中导入@hotwired/turbo-rails

查看stimulus source code，它看起来像是正在检查不同的文件：

if (Rails.root.join("app/javascript/application.js")).exist?

所以这与我认为我需要做的事情不一致。

现在，我假设这些都是无害的，但我在让示例正常工作时遇到了一些问题，所以在疯狂调试之前，我想要追查这些错误消息。其他人似乎都没有得到它们。是新引入的bug还是什么？

Answer 1

使用webpacker默认安装rails时，app/javascript/packs/application.js上应该有一个入口点文件，其中已经包含了一些默认代码。如果没有，您是否启用了webpacker？尝试rails webpacker:install，然后您应该有了可以添加import '../controllers'和import '@hotwired/turbo'的入口点。

Answer 2

这看起来一切都很正常，rails只是想把它做的事情输出到控制台，但它应该已经把这些内容添加到你的文件中了。