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Rails 7.0.0+Ruby 3.1.0のGemfileは7-0-stableブランチの指定が必要

January 5, 2022, 12:30 am
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現象

Ruby 3.1.0がリリースされた直後にRails 7.0.0をRuby 3.1.0で動かそうとすると、以下のRails::Engine is abstract, you cannot instantiate it directly.エラーが出て動きませんでした。これはrails newの場合ですが、他の操作でも出ました。

$ dip rails new . --skip-git
Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
       exist
    conflict  README.md
Overwrite /app/README.md? (enter "h" for help) [Ynaqdhm] n
        skip  README.md
      create  Rakefile
    conflict  .ruby-version
Overwrite /app/.ruby-version? (enter "h" for help) [Ynaqdhm] n
        skip  .ruby-version
      create  config.ru
    conflict  Gemfile
Overwrite /app/Gemfile? (enter "h" for help) [Ynaqdhm] y
       force  Gemfile
      create  app
      create  app/assets/config/manifest.js
      create  app/assets/stylesheets/application.css
      create  app/channels/application_cable/channel.rb
      create  app/channels/application_cable/connection.rb
      create  app/controllers/application_controller.rb
      create  app/helpers/application_helper.rb
      create  app/jobs/application_job.rb
      create  app/mailers/application_mailer.rb
      create  app/models/application_record.rb
      create  app/views/layouts/application.html.erb
      create  app/views/layouts/mailer.html.erb
      create  app/views/layouts/mailer.text.erb
      create  app/assets/images
      create  app/assets/images/.keep
      create  app/controllers/concerns/.keep
      create  app/models/concerns/.keep
      create  bin
      create  bin/rails
      create  bin/rake
      create  bin/setup
      create  config
      create  config/routes.rb
      create  config/application.rb
      create  config/environment.rb
      create  config/cable.yml
      create  config/puma.rb
      create  config/storage.yml
      create  config/environments
      create  config/environments/development.rb
      create  config/environments/production.rb
      create  config/environments/test.rb
      create  config/initializers
      create  config/initializers/assets.rb
      create  config/initializers/content_security_policy.rb
      create  config/initializers/cors.rb
      create  config/initializers/filter_parameter_logging.rb
      create  config/initializers/inflections.rb
      create  config/initializers/new_framework_defaults_7_0.rb
      create  config/initializers/permissions_policy.rb
      create  config/locales
      create  config/locales/en.yml
      create  config/master.key
      create  config/boot.rb
      create  config/database.yml
      create  db
      create  db/seeds.rb
      create  lib
      create  lib/tasks
      create  lib/tasks/.keep
      create  lib/assets
      create  lib/assets/.keep
      create  log
      create  log/.keep
      create  public
      create  public/404.html
      create  public/422.html
      create  public/500.html
      create  public/apple-touch-icon-precomposed.png
      create  public/apple-touch-icon.png
      create  public/favicon.ico
      create  public/robots.txt
       exist  tmp
      create  tmp/.keep
      create  tmp/pids
      create  tmp/pids/.keep
       exist  tmp/cache
      create  tmp/cache/assets
      create  vendor
      create  vendor/.keep
      create  test/fixtures/files
      create  test/fixtures/files/.keep
      create  test/controllers
      create  test/controllers/.keep
      create  test/mailers
      create  test/mailers/.keep
      create  test/models
      create  test/models/.keep
      create  test/helpers
      create  test/helpers/.keep
      create  test/integration
      create  test/integration/.keep
      create  test/channels/application_cable/connection_test.rb
      create  test/test_helper.rb
      create  test/system
      create  test/system/.keep
      create  test/application_system_test_case.rb
      create  storage
      create  storage/.keep
      create  tmp/storage
      create  tmp/storage/.keep
      remove  config/initializers/cors.rb
      remove  config/initializers/new_framework_defaults_7_0.rb
         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 5.15.0
Using builder 3.2.4
Using erubi 1.10.0
Using crass 1.0.6
Using rack 2.2.3
Using mini_portile2 2.6.1
Using nio4r 2.5.8
Using marcel 1.0.2
Using mini_mime 1.1.2
Fetching public_suffix 4.0.6
Fetching bindex 0.8.1
Using websocket-extensions 0.1.5
Using racc 1.6.0
Fetching msgpack 1.4.2
Using bundler 2.3.3
Fetching matrix 0.4.2
Installing bindex 0.8.1 with native extensions
Installing matrix 0.4.2
Installing msgpack 1.4.2 with native extensions
Installing public_suffix 4.0.6
Fetching regexp_parser 2.2.0
Installing regexp_parser 2.2.0
Fetching childprocess 4.1.0
Fetching io-console 0.5.11
Installing io-console 0.5.11 with native extensions
Installing childprocess 4.1.0
Using method_source 1.0.0
Using thor 1.1.0
Using zeitwerk 2.5.3
Fetching rexml 3.2.5
Installing rexml 3.2.5
Fetching rubyzip 2.3.2
Fetching sqlite3 1.4.2
Installing rubyzip 2.3.2
Installing sqlite3 1.4.2 with native extensions
Using i18n 1.8.11
Using tzinfo 2.0.4
Using rack-test 1.1.0
Using mail 2.7.1
Fetching puma 5.5.2
Installing puma 5.5.2 with native extensions
Fetching sprockets 4.0.2
Installing sprockets 4.0.2
Using websocket-driver 0.7.5
Using nokogiri 1.12.5
Fetching addressable 2.8.0
Fetching selenium-webdriver 4.1.0
Installing addressable 2.8.0
Using activesupport 7.0.0
Fetching reline 0.3.1
Installing selenium-webdriver 4.1.0
Using loofah 2.13.0
Fetching xpath 3.2.0
Installing reline 0.3.1
Using rails-dom-testing 2.0.3
Using globalid 1.0.0
Using activemodel 7.0.0
Fetching webdrivers 5.0.0
Installing xpath 3.2.0
Using rails-html-sanitizer 1.4.2
Using irb 1.4.1
Using activejob 7.0.0
Using activerecord 7.0.0
Fetching capybara 3.36.0
Installing webdrivers 5.0.0
Using actionview 7.0.0
Fetching debug 1.4.0
Installing capybara 3.36.0
Installing debug 1.4.0 with native extensions
Using actionpack 7.0.0
Fetching jbuilder 2.11.5
Installing jbuilder 2.11.5
Using actioncable 7.0.0
Using activestorage 7.0.0
Using actionmailer 7.0.0
Using railties 7.0.0
Fetching sprockets-rails 3.4.2
Installing sprockets-rails 3.4.2
Using actionmailbox 7.0.0
Using actiontext 7.0.0
Fetching importmap-rails 1.0.1
Installing importmap-rails 1.0.1
Fetching stimulus-rails 1.0.2
Installing stimulus-rails 1.0.2
Fetching turbo-rails 1.0.0
Fetching web-console 4.2.0
Installing web-console 4.2.0
Installing turbo-rails 1.0.0
Using rails 7.0.0
Fetching bootsnap 1.9.3
Installing bootsnap 1.9.3 with native extensions
Bundle complete! 15 Gemfile dependencies, 67 gems now installed.
Bundled gems are installed into `/bundle`
         run  bundle binstubs bundler
Skipped bundle since it already exists.
If you want to overwrite skipped stubs, use --force.
       rails  importmap:install
Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
rails aborted!
Rails::Engine is abstract, you cannot instantiate it directly.
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/railtie.rb:246:in `initialize'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/railtie.rb:184:in `new'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/railtie.rb:184:in `instance'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/railtie.rb:223:in `method_missing'
/bundle/ruby/3.1.0/gems/activesupport-7.0.0/lib/active_support/descendants_tracker.rb:90:in `descendants'
/bundle/ruby/3.1.0/gems/activesupport-7.0.0/lib/active_support/callbacks.rb:923:in `block in define_callbacks'
/bundle/ruby/3.1.0/gems/activesupport-7.0.0/lib/active_support/callbacks.rb:920:in `each'
/bundle/ruby/3.1.0/gems/activesupport-7.0.0/lib/active_support/callbacks.rb:920:in `define_callbacks'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/engine.rb:427:in `<class:Engine>'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/engine.rb:349:in `<module:Rails>'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/engine.rb:11:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/application.rb:11:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails.rb:13:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/all.rb:5:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/app/config/application.rb:3:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:54:in `require_relative'
/app/rakefile:4:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:60:in `load'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:60:in `load'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/commands/rake/rake_command.rb:20:in `block in perform'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/commands/rake/rake_command.rb:18:in `perform'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/command.rb:51:in `invoke'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/commands.rb:18:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
bin/rails:4:in `<main>'
(See full trace by running task with --trace)
       rails  turbo:install stimulus:install
Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
rails aborted!
Rails::Engine is abstract, you cannot instantiate it directly.
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/railtie.rb:246:in `initialize'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/railtie.rb:184:in `new'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/railtie.rb:184:in `instance'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/railtie.rb:223:in `method_missing'
/bundle/ruby/3.1.0/gems/activesupport-7.0.0/lib/active_support/descendants_tracker.rb:90:in `descendants'
/bundle/ruby/3.1.0/gems/activesupport-7.0.0/lib/active_support/callbacks.rb:923:in `block in define_callbacks'
/bundle/ruby/3.1.0/gems/activesupport-7.0.0/lib/active_support/callbacks.rb:920:in `each'
/bundle/ruby/3.1.0/gems/activesupport-7.0.0/lib/active_support/callbacks.rb:920:in `define_callbacks'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/engine.rb:427:in `<class:Engine>'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/engine.rb:349:in `<module:Rails>'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/engine.rb:11:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/application.rb:11:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails.rb:13:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/all.rb:5:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/app/config/application.rb:3:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:54:in `require_relative'
/app/rakefile:4:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:60:in `load'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:60:in `load'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/commands/rake/rake_command.rb:20:in `block in perform'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/commands/rake/rake_command.rb:18:in `perform'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/command.rb:51:in `invoke'
/bundle/ruby/3.1.0/gems/railties-7.0.0/lib/rails/commands.rb:18:in `<main>'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
bin/rails:4:in `<main>'
(See full trace by running task with --trace)

原因

2021年12月はRails 7.0.0が先にリリースされ、その後でRuby 3.1がリリースされました。Rails 7.0.0ではRuby 3.1.0の新機能であるClass#descendantsをいち早く取り入れていました。しかしClass#descendantsはRuby 3.1リリース直前にMatzの意向で仕様再検討のためいったん削除された（#5309）、という流れのようです。それによってRails 7のClass#descendantsに依存している部分がエラーになったようです。

上のプルリクはClass#descendantsへの依存をRails 7から削除します。これはmainブランチと7-0-stableブランチにはマージ済みで、今後Rails 7.0.1に含まれる見込みです。

現時点の解決方法

既に@yahondaさんが解決方法や詳しい解説をgistにまとめてくださっています🙏。正直、ここを見れば必要なことはわかります。

同Gistにもあるように、Rails 7.0.0をRuby 3.1で動かすには、Gemfileで7-0-stableブランチを指定する必要があります（この場合以下のようにリポジトリ名も指定する必要があります）。今後はRails 7.0.1がリリースされれば解消されるはずです。

# Gemfile
gem "rails", github: "rails/rails", branch: "7-0-stable"

なお、rails newの場合は、事前にbundle initで生成したGemfileで上のように7-0-stableブランチを指定しておいても、Gemfileが更新されるときに以下のようにデフォルトの7.0.0で上書きされてしまうので、上の現象が再発しました。

# Gemfile
source "https://rubygems.org"
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby "3.1.0"

# Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
gem "rails", "~> 7.0.0"
# ...

私の場合は、このGemfileだけいったん残して他の生成ファイルを削除し、Gemfileを以下のようにgem "rails", github: "rails/rails", branch: "7-0-stable"に変更してbundle installしてから、改めてrails newするという方法で無理やり回避しました。

# Gemfile
source "https://rubygems.org"
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby "3.1.0"

# Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
gem "rails", github: "rails/rails", branch: "7-0-stable"
# ...

参考: Ruby 3.1.0向けの設定

Ruby 3.1.0のYJITを有効にするには、環境変数RUBY_YJIT_ENABLE=1を設定するか、起動時に--yjitオプションを追加します。

また、Rails 7.0.0ではconfig/application.rbでconfig.active_support.disable_to_s_conversion
= trueを設定すると、Ruby 3.1.0で最適化された式展開を有効にするためにto_sを上書きしなくなります。

参考: thorのwarningについて

上の問題とは別に、以下のdeprecation warningがthor gemで発生していました。

Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.

Ruby 3.1環境でyamlを扱うさまざまな場所でこのwarningが表示されます。thorはRailsリポジトリにあるgemですが、Rails以外でも使われていることがあります。

私の場合は、以下のdipツールで上のwarningが出るようになりました。影響があるわけではありませんが、ちょっと目障りですね。

docker-composeを便利にするツール「dip」を使ってみた

昨年末に以下のプルリクが上がっていましたが、つい今朝がたマージされました🎉。gem updateでthorを更新するとdipでもwarningが発生しなくなりました。

関連記事

Rails 7.0.0がリリースされました

Rails 7 : rails newのフロントエンド関連オプションの組み合わせを調べてみた

Ruby 3.1.0がリリースされました

The post Rails 7.0.0+Ruby 3.1.0のGemfileは7-0-stableブランチの指定が必要 first appeared on TechRacho.

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