Q&A前提・実現したいこと
Railsの初学者です。現在開発中のアプリをローカル環境で動かしながら作業してしていたところ、rails sコマンドが使えなくなりました。またrails gやrails cも使えなくなっておりエラー文の
(erb):2:in `<main>': undefined method `[]' for nil:NilClass (NoMethodError)
部分を見る限りだとどこが原因となっているのかを自分では特定出来ず調べたりしたのですが、原因が分からずそこから詰まっております。恐れ入りますがどこに解決の糸口があるのかアドバイスをいただけると幸いです。
発生している問題・エラーメッセージ
rails s 実行時（rails g,rails cコマンドでも同様のエラーです） (erb):2:in `<main>': undefined method `[]' for nil:NilClass (NoMethodError) from /Users/.rbenv/versions/3.0.0/lib/ruby/3.0.0/erb.rb:905:in `eval' from /Users/.rbenv/versions/3.0.0/lib/ruby/3.0.0/erb.rb:905:in `result' from /Users/vendor/bundle/ruby/3.0.0/gems/config-3.1.0/lib/config/sources/yaml_source.rb:19:in `load' from /Users/vendor/bundle/ruby/3.0.0/gems/config-3.1.0/lib/config/options.rb:38:in `block in reload!' from /Users/vendor/bundle/ruby/3.0.0/gems/config-3.1.0/lib/config/options.rb:37:in `each' from /Users/vendor/bundle/ruby/3.0.0/gems/config-3.1.0/lib/config/options.rb:37:in `reload!' from /Users/vendor/bundle/ruby/3.0.0/gems/config-3.1.0/lib/config.rb:48:in `load_files' from /Users/vendor/bundle/ruby/3.0.0/gems/config-3.1.0/lib/config.rb:56:in `load_and_set_settings' from /Users/vendor/bundle/ruby/3.0.0/gems/config-3.1.0/lib/config/integrations/rails/railtie.rb:11:in `preload' from /Users/vendor/bundle/ruby/3.0.0/gems/railties-6.1.3.1/lib/rails/railtie.rb:207:in `public_send' from /Users/vendor/bundle/ruby/3.0.0/gems/railties-6.1.3.1/lib/rails/railtie.rb:207:in `method_missing' from /Users/vendor/bundle/ruby/3.0.0/gems/config-3.1.0/lib/config/integrations/rails/railtie.rb:21:in `block in <class:Railtie>' from /Users/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/lazy_load_hooks.rb:68:in `block in execute_hook' from /Users/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/lazy_load_hooks.rb:61:in `with_execution_control' from /Users/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/lazy_load_hooks.rb:66:in `execute_hook' from /Users/hayat/voice_component/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks' from /Users/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/lazy_load_hooks.rb:51:in `each' from /Users/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks' from /Users/vendor/bundle/ruby/3.0.0/gems/railties-6.1.3.1/lib/rails/application.rb:96:in `inherited' from /Users/config/application.rb:24:in `<module:VoiceComponent>' from /Users/config/application.rb:22:in `<main>' from /Users/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' from /Users/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi' from /Users/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' from /Users/hayat/voice_component/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' from /Users/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' from /Users/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/dependencies.rb:332:in `block in require' from /Users/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/dependencies.rb:299:in `load_dependency' from /Users/vendor/bundle/ruby/3.0.0/gems/activesupport-6.1.3.1/lib/active_support/dependencies.rb:332:in `require' from /Users/vendor/bundle/ruby/3.0.0/gems/railties-6.1.3.1/lib/rails/commands/server/server_command.rb:138:in `block in perform' from <internal:kernel>:90:in `tap' from /Users/vendor/bundle/ruby/3.0.0/gems/railties-6.1.3.1/lib/rails/commands/server/server_command.rb:135:in `perform' from /Users/vendor/bundle/ruby/3.0.0/gems/thor-1.1.0/lib/thor/command.rb:27:in `run' from /Users/vendor/bundle/ruby/3.0.0/gems/thor-1.1.0/lib/thor/invocation.rb:127:in `invoke_command' from /Users/vendor/bundle/ruby/3.0.0/gems/thor-1.1.0/lib/thor.rb:392:in `dispatch' from /Users/vendor/bundle/ruby/3.0.0/gems/railties-6.1.3.1/lib/rails/command/base.rb:69:in `perform' from /Users/vendor/bundle/ruby/3.0.0/gems/railties-6.1.3.1/lib/rails/command.rb:50:in `invoke' from /Users/vendor/bundle/ruby/3.0.0/gems/railties-6.1.3.1/lib/rails/commands.rb:18:in `<main>' from /Users/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' from /Users/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi' from /Users/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' from /Users/hayat/voice_component/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' from /Users/vendor/bundle/ruby/3.0.0/gems/bootsnap-1.7.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' from /Users/bin/rails:5:in `<top (required)>' from /Users/vendor/bundle/ruby/3.0.0/gems/spring-2.1.1/lib/spring/client/rails.rb:28:in `load' from /Users/vendor/bundle/ruby/3.0.0/gems/spring-2.1.1/lib/spring/client/rails.rb:28:in `call' from /Users/vendor/bundle/ruby/3.0.0/gems/spring-2.1.1/lib/spring/client/command.rb:7:in `call' from /Users/vendor/bundle/ruby/3.0.0/gems/spring-2.1.1/lib/spring/client.rb:30:in `run' from /Users/vendor/bundle/ruby/3.0.0/gems/spring-2.1.1/bin/spring:49:in `<top (required)>' from /Users/vendor/bundle/ruby/3.0.0/gems/spring-2.1.1/lib/spring/binstub.rb:11:in `load' from /Users/vendor/bundle/ruby/3.0.0/gems/spring-2.1.1/lib/spring/binstub.rb:11:in `<top (required)>' from <internal:/Users/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require' from <internal:/Users/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require' from /Users/bin/spring:10:in `block in <top (required)>' from <internal:kernel>:90:in `tap' from /Users/hayat/voice_component/bin/spring:7:in `<top (required)>' from bin/rails:2:in `load' from bin/rails:2:in `<main>'
該当のソースコード
こちらが原因ではないかもしれませんが、補足情報に載せている参考記事にdatabase.ymlが原因ではないかとの記載があったのでこちらを載せます。
ソースコード config/database.yml 2 default: &default 3 adapter: mysql2 4 encoding: utf8mb4 5 charset: utf8mb4 6 collation: utf8mb4_general_ci 7 pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %> 8 username: root 9 password: 10 socket: /tmp/mysql.sock 11 12 development: 13 <<: *default 14 database: Sample_development 15 16 test: 17 <<: *default 18 database: Sample_test 19 20 production: 21 <<: *default 22 database: <%= Rails.application.credentials.db[:database] %> 23 username: <%= Rails.application.credentials.db[:username] %> 24 password: <%= Rails.application.credentials.db[:password] %> 25 host: <%= Rails.application.credentials.db[:host] %> 26
試したこと
$ gem install bundler
を実行し、その後下記を実行
$ bundle install --path vendor/bundle
補足情報（FW/ツールのバージョンなど）
Rails 6.1.3.1 ruby 3.0.0
調べていて似たようなエラーの参考記事があったのですが、これが自分の中で上手く理解しきれておらず、まだこちらは試しておりません。
https://stackoverflow.com/questions/65496869/erb48in-main-undefined-method-for-nilnilclass-nomethoderror
回答2件
0
database: <%= Rails.application.credentials.db[:database] %>
username: <%= Rails.application.credentials.db[:username] %>
password: <%= Rails.application.credentials.db[:password] %>
host: <%= Rails.application.credentials.db[:host] %>
これらは、Rails.application.credentials.dbが読み取れる事を期待しています。
そのためにはmaster.keyもしくは環境変数RAILS_MASTER_KEYが必要です。
あなたにmaster.keyにアクセスする権限がある場合は設定すりゃいいですが
権限がない場合、もしくは管理に自信がない場合には以下２つの道があります。
database.ymlを都度変更し以上の4行を消し、git commitしないようにexcludeにdatabase.ymlを登録しておくdatabase.ymlを
yaml
1database: <%= Rails.application.credentials.dig(:db, :database) %> 2username: <%= Rails.application.credentials.dig(:db, :username) %> 3password: <%= Rails.application.credentials.dig(:db, :password) %> 4host: <%= Rails.application.credentials.dig(:db, :host) %>
に書き換え、権限のある人にテストしてもらいgitにもcommit/pushする。
投稿2021/06/29 07:27
総合スコア15147
0
自己解決
こちらmaster.keyをもう一度よく確認したところ改行が入っており、そこを削除したところ無事に復旧いたしました。
投稿2021/07/01 23:48
総合スコア4
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2021/06/29 08:51 編集
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