コンテナ内では、discourse ユーザーとして discourse ディレクトリのルートで bin/rails db を実行すると、正しいデータベースに接続できます。
「いいね！」 1
こんにちは:waving_hand:
私も再構築中にこの問題に遭遇しました。サイトを復旧させる唯一の方法は、以前のコミットに戻すことでした。正常に動作するコミットに戻した後、このトピックを見つけてクエリを実行しました。根本原因を特定するために、結果がまだ役立つことを願っています。
クエリ #1
table_schema | column_name | column_default
--------------+---------------------------+----------------
backup | discourse_rewind_disabled | false
public | discourse_rewind_disabled | false
(2 rows)
クエリ #2
nspname | oid
---------+-------
public | 2200
backup | 22997
(2 rows)
クエリ #3
table_schema | has_default
--------------+-------------
backup | t
public | t
(2 rows)
クエリ #4
nspname | oid
---------------------+-------
discourse_functions | 19411
backup | 22997
(2 rows)
「いいね！」 1
@Don、クエリの実行ありがとうございます。根本原因が確認できました 
あなたの結果は、私たちが疑っていたことを正確に示しています。
user_optionsのコピーを含むbackupスキーマがあります。- そのテーブルにはまだ古いデフォルト (
column_default = false) が残っています。 - クエリ結果では
backupの行がpublicよりも前に表示されました。
マイグレーションが public.user_options のデフォルトを削除したとき、backup.user_options には触れませんでした。その後、mark_readonly がスキーマでフィルタリングせずに information_schema.columns をクエリし、最初に backup の行（まだデフォルトが設定されていた）を取得したため、失敗しました 
修正方法は、マイグレーションが実際に操作するスキーマのみをチェックするように、クエリに単純に table_schema = 'public' を追加することです。
「いいね！」 4
修正ありがとうございます！私の方ではすべて完璧に動作しています 
「いいね！」 4
誠に申し訳ありません、データベースに入る前に問題が発生し、クエリ結果を提供できませんでした。幸いなことに、Donがすでにフィードバックしてくれています。
discourse@jerry-app:/var/www/discourse$ bin/rails db
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:71:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'debug/prelude'. (Bundler::GemRequireError)
Gem Load Error is: cannot load such file -- debug/prelude
Backtrace for gem load error is:
<internal:/usr/local/lib/ruby/3.3.0/rubygems/core_ext/kernel_require.rb>:37:in `require'
<internal:/usr/local/lib/ruby/3.3.0/rubygems/core_ext/kernel_require.rb>:37:in `require'
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:63:in `block (2 levels) in require'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:58:in `each'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:58:in `block in require'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:52:in `each'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:52:in `require'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler.rb:215:in `require'
/var/www/discourse/config/application.rb:55:in `<main>'
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `require'
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/bootsnap-1.19.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/actions.rb:15:in `require_application!'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/environment_argument.rb:31:in `require_application!'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/actions.rb:19:in `boot_application!'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/commands/dbconsole/dbconsole_command.rb:83:in `perform'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/command.rb:28:in `run'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/invocation.rb:127:in `invoke_command'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/base.rb:178:in `invoke_command'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor.rb:538:in `dispatch'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/base.rb:73:in `perform'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:65:in `block in invoke'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:143:in `with_argv'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:63:in `invoke'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/commands.rb:18:in `<main>'
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `require'
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/bootsnap-1.19.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
bin/rails:18:in `<main>'
Bundler Error Backtrace:
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:62:in `block (2 levels) in require'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:58:in `each'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:58:in `block in require'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:52:in `each'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:52:in `require'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler.rb:215:in `require'
from /var/www/discourse/config/application.rb:55:in `<main>'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `require'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/bootsnap-1.19.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/actions.rb:15:in `require_application!'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/environment_argument.rb:31:in `require_application!'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/actions.rb:19:in `boot_application!'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/commands/dbconsole/dbconsole_command.rb:83:in `perform'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/command.rb:28:in `run'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/invocation.rb:127:in `invoke_command'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/base.rb:178:in `invoke_command'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor.rb:538:in `dispatch'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/base.rb:73:in `perform'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:65:in `block in invoke'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:143:in `with_argv'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:63:in `invoke'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/commands.rb:18:in `<main>'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `require'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/bootsnap-1.19.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
from bin/rails:18:in `<main>'
<internal:/usr/local/lib/ruby/3.3.0/rubygems/core_ext/kernel_require.rb>:37:in `require': cannot load such file -- debug/prelude (LoadError)
from <internal:/usr/local/lib/ruby/3.3.0/rubygems/core_ext/kernel_require.rb>:37:in `require'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:63:in `block (2 levels) in require'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:58:in `each'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:58:in `block in require'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:52:in `each'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/runtime.rb:52:in `require'
from /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler.rb:215:in `require'
from /var/www/discourse/config/application.rb:55:in `<main>'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `require'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/bootsnap-1.19.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/actions.rb:15:in `require_application!'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/environment_argument.rb:31:in `require_application!'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/actions.rb:19:in `boot_application!'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/commands/dbconsole/dbconsole_command.rb:83:in `perform'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/command.rb:28:in `run'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor/invocation.rb:127:in `invoke_command'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/base.rb:178:in `invoke_command'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/thor-1.4.0/lib/thor.rb:538:in `dispatch'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command/base.rb:73:in `perform'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:65:in `block in invoke'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:143:in `with_argv'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/command.rb:63:in `invoke'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-8.0.4/lib/rails/commands.rb:18:in `<main>'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `require'
from /usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
from /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/bootsnap-1.19.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
from bin/rails:18:in `<main>'
discourse@jerry-app:/var/www/discourse$
しかし、このデータベースに入る問題はどのように解決すればよいでしょうか？
私は以下の手順でトラブルシューティングを行いました。
# 1. Gemfile 内での debug の位置を確認
grep -n debug /var/www/discourse/Gemfile
# 2. application.rb で直接 require されていないか確認
grep -n debug /var/www/discourse/config/application.rb
# 3. プラグインによって導入されていないか確認
find /var/www/discourse/plugins -name '*.rb' -exec grep -l debug {} \;
返された結果は以下の通りです。
discourse@jerry-app:~$ grep -n debug /var/www/discourse/Gemfile
147: gem "debug", ">= 1.0.0", require: "debug/prelude"
discourse@jerry-app:~$ grep -n debug /var/www/discourse/config/application.rb
discourse@jerry-app:~$ find /var/www/discourse/plugins -name '*.rb' -exec grep -l debug {} \;
/var/www/discourse/plugins/chat/app/controllers/chat/incoming_webhooks_controller.rb
/var/www/discourse/plugins/chat/app/jobs/regular/chat/channel_delete.rb
/var/www/discourse/plugins/chat/spec/requests/chat/incoming_webhooks_controller_spec.rb
/var/www/discourse/plugins/automation/lib/discourse_automation/triggers/recurring.rb
/var/www/discourse/plugins/discourse-oauth2-basic/lib/oauth2_basic_authenticator.rb
/var/www/discourse/plugins/discourse-ai/app/controllers/discourse_ai/admin/ai_llms_controller.rb
/var/www/discourse/plugins/discourse-ai/app/controllers/discourse_ai/ai_bot/bot_controller.rb
/var/www/discourse/plugins/discourse-ai/evals/lib/recorder.rb
/var/www/discourse/plugins/discourse-ai/evals/lib/prompts/single_test_runner.rb
/var/www/discourse/plugins/discourse-ai/discourse_automation/llm_report.rb
/var/www/discourse/plugins/discourse-ai/lib/automation/llm_tagger.rb
/var/www/discourse/plugins/discourse-ai/lib/automation/report_runner.rb
/var/www/discourse/plugins/discourse-ai/lib/ai_bot/response_http_streamer.rb
/var/www/discourse/plugins/discourse-ai/lib/ai_bot/entry_point.rb
/var/www/discourse/plugins/discourse-ai/lib/guardian_extensions.rb
/var/www/discourse/plugins/discourse-ai/config/routes.rb
/var/www/discourse/plugins/discourse-ai/spec/requests/ai_bot/bot_controller_spec.rb
/var/www/discourse/plugins/discourse-ai/spec/lib/modules/automation/report_runner_spec.rb
/var/www/discourse/plugins/discourse-ai/spec/lib/modules/ai_bot/entry_point_spec.rb
/var/www/discourse/plugins/docker_manager/app/controllers/docker_manager/admin_controller.rb
私はDockerを使用してDiscourseをデプロイし（プラグインはインストールしていません）、コンテナ内でMySQLをインストールし、XenForoデータベースをインポートしました。その後、移行スクリプトを使用してXenForoからDiscourseへ移行しました。この間、コンテナ内でGemfileの設定を変更したはずです。移行成功後、複数回rebuildによるアップグレード更新を行いました。
私の疑問は、Discourseに対して複数回のrebuildアップグレード更新を行ったにもかかわらず、なぜbin/rails db操作でまだ問題が発生するのかということです。
ありがとうございます。
最新のフィードバックによると、OSの再インストール、Discourseの再デプロイ、バックアップのインポートを行っても、まだこのエラーが発生しています。