ユーザー名の大文字が作曲者の到達可能なメンションチェックを破損させる

zogstrip · 2026 年 5 月 13 日午後 4:25

私の「修正」が AI エージェントでこの問題を引き起こしたようです

github.com/discourse/discourse

FIX: Suppress composer mention warning for AI bot users (#39986)

main ← fix-composer-mention-warning-ai-bots

opened 04:24PM - 13 May 26 UTC

ZogStriP

+85 -1

Mentioning an AI bot (e.g. `@Forum_Research_Assis`) in a topic the bot's User re…cord can't see — like a category restricted to a group the bot isn't part of — surfaced the "this user cannot see this mention" warning popup in the composer. The warning is misleading: AI bots reply via `PostCreator.create!(... skip_guardian: true)` (`playground.rb`), so they respond regardless of whether their User can `Guardian#can_see?` the topic. The previous case-insensitive fix (9a4cca29) exposed this latent behavior. Pre-fix, mixed-case names hit a case-sensitive hash miss in `ComposerController#mentions` and silently returned an empty `user_reasons`. Post-fix, the lookup hits correctly and the reachability check — which was always there — now fires for AI bot users that genuinely can't see the topic. Adds a `:composer_mention_user_reason` plugin modifier, applied after the standard reason is computed in `user_reason`, so plugins can clear or transform it. The AI plugin registers against the modifier and returns `nil` for any user in `DiscourseAi::AiBot::EntryPoint.all_bot_ids` (covering both AI agent users and chat-bot-enabled LLM model users). discobot and the system user are intentionally unaffected: discobot's `PostCreator.create!` does not skip the guardian, so the reachability warning remains accurate for it. https://meta.discourse.org/t/401292

トピック		返信	表示
Rich editor misses usernames with umlauts Bug composer	4	208	2025 年 8 月 1 日
Preview is changing casing of @ mentions Bug	2	892	2015 年 6 月 15 日
Discobot case-sensitive mentions Bug	3	608	2019 年 5 月 7 日
Unicode username with Σ as the final char leads to an error loading profile page Bug	36	2345	2021 年 2 月 23 日
Highlighting current user and bots in posts UX design-experiment , feedback	3	154	2026 年 3 月 19 日

ユーザー名の大文字が作曲者の到達可能なメンションチェックを破損させる

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