「このカテゴリでは使用できません」タグ - 制限付きタグの場合

zogstrip · 2026 年 7 月 22 日午後 2:26

@AstonJ さん、報告ありがとうございますこれはアプリ全体でどのタグを表示・使用できるかを一貫させることで、この問題だけでなく他の問題も解消されるはずです。

github.com/discourse/discourse

FIX: Allow selecting tags that are only used in personal messages (#41918)

main ← fix-pm-only-tags-selectable

merged 10:27AM - 24 Jul 26 UTC

ZogStriP

+363 -72

Previously, a tag whose only usage was in personal messages was silently dropped… by `TagsController.tag_counts_json` — a display rule from 2020 meant to keep such tags off the `/tags` browse page for users who cannot tag messages (and `pm_tags_allowed_for_groups` has no staff bypass, so by default that includes admins). Every surface reusing that method as a plain serializer inherited the rule by accident: - the composer tag search treated the missing row as unauthorized and showed the tag disabled with a bogus **"Can't be used in this category"** reason (the reported bug), - every "show all tags" chooser (tag groups, synonyms, watched tags, category allowed tags, webhooks, automations, …) silently refused to offer such tags at all, - the `#` autocomplete would not suggest a tag that nonetheless cooked into a working hashtag link when typed in full. This change makes `tag_counts_json` a pure serializer and moves the rule into an explicit, named helper (`DiscourseTagging.without_pm_only_tags`) applied only where it belongs — the `/tags` browse lists — with an exemption for the admin "show all tags" view so the admin inventory is complete. Selection and search surfaces now offer every tag the user is allowed to use, and tag-group visibility rules still apply everywhere. It also fixes two adjacent inconsistencies uncovered along the way: - **Topic→message conversion counter drift.** Converting only adjusted `public_topic_count`, so a converted topic's tags kept working until the periodic consistency job recounted them into the broken state — the "worked at first, broke a day later" in the report. The converter now moves all three counters immediately, and rolls back cleanly when the underlying post revision fails (its return value was previously ignored, and `Topic#valid?` clears the errors it adds, so a failed conversion still applied its side effects). - **Crawler/print tag leak.** The crawler layout leaked a message's tag names in the page title and `og:article:tag` metadata to participants the serializer already hides tags from; both now flow through `TopicView#visible_tags`, gated on `guardian.can_see_tags?`. Reported in https://meta.discourse.org/t/407050

トピック		返信	表示
Restrict certain Tags to a category, but still allow that category to use all other Tags Feature	21	2162	2026 年 1 月 9 日
CategoryTag no_content message doesn't describe what is happening UX	1	836	2019 年 1 月 3 日
Limiting tags to categories not working as expected Bug tags	8	845	2023 年 5 月 17 日
Restrict tags to specific categories Feature completed	16	5294	2016 年 6 月 1 日
Limit category selections for topics based on tag restrictions Feature tags	2	320	2023 年 10 月 12 日

「このカテゴリでは使用できません」タグ - 制限付きタグの場合

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