「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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1年前にタグが使えなかった理由を調べるために、このデータエクスプローラーのクエリを作成しました。このクエリは、タグまたはタググループが他のカテゴリに制限されているか、あるいはカテゴリが他のタグに制限されているかを確認します。これは Group tag in new topic doesn't show the tags - #2 by Moin にある内容のフォーラム全体の概要に相当します。

-- [params]
-- null string :tag_name
-- null string :tag_group

WITH allowed_tags AS (
  SELECT ct.category_id, t.id AS tag_id
  FROM category_tags ct
  JOIN tags t ON t.id = ct.tag_id
  UNION
  SELECT ctg.category_id, tgm.tag_id
  FROM category_tag_groups ctg
  JOIN tag_group_memberships tgm ON tgm.tag_group_id = ctg.tag_group_id
),

restricted_categories AS (
  SELECT c.id, c.name
  FROM categories c
  WHERE c.allow_global_tags = FALSE
    AND (
      EXISTS (SELECT 1 FROM category_tags ct WHERE ct.category_id = c.id)
      OR EXISTS (SELECT 1 FROM category_tag_groups ctg WHERE ctg.category_id = c.id)
    )
),

all_tag_category_combinations AS (
  SELECT t.id AS tag_id, t.name AS tag_name, rc.id AS category_id, rc.name AS category_name
  FROM tags t
  CROSS JOIN restricted_categories rc
  WHERE t.target_tag_id IS NULL
),

not_allowed_tags AS (
  SELECT atcc.tag_id, atcc.category_id, atcc.category_name
  FROM all_tag_category_combinations atcc
  LEFT JOIN allowed_tags al
    ON al.tag_id = atcc.tag_id AND al.category_id = atcc.category_id
  WHERE al.tag_id IS NULL
)

SELECT
  main.id AS tag_id,
  main.name AS tag_name,
  COALESCE(STRING_AGG(DISTINCT syn.name, ', '), '') AS synonyms,

  tg.id AS tag_group_id,
  COALESCE(parent_tag.name, '') AS parent_tag_name,  
  CASE WHEN tg.one_per_topic THEN 'true' ELSE '' END AS one_tag_per_topic,

  COALESCE(
    STRING_AGG(
      DISTINCT
      CASE
        WHEN crtg.min_count IS NOT NULL THEN crtg_cat.name || ' (' || crtg.min_count || ')'
        ELSE NULL
      END,
      ', '
    ),
    ''
  ) AS required_in_categories_with_min,

  COALESCE(STRING_AGG(DISTINCT ctg_cat.name, ', '), '') AS tag_group_limited_to_category,
  COALESCE(STRING_AGG(DISTINCT ctags_cat.name, ', '), '') AS tag_limited_to_category,
  COALESCE(STRING_AGG(DISTINCT nat.category_name, ', '), '') AS not_allowed_in_categories,

  CASE 
    WHEN COUNT(DISTINCT g.name) > 0 THEN COALESCE(STRING_AGG(DISTINCT g_use.name, ', '), '')
    ELSE ''
  END AS use_limited_to,
  COALESCE(STRING_AGG(DISTINCT g.name, ', '), '') AS view_only_groups

FROM tags AS main
LEFT JOIN tags AS syn ON syn.target_tag_id = main.id
LEFT JOIN tag_group_memberships AS tgm ON tgm.tag_id = main.id
LEFT JOIN tag_groups AS tg ON tg.id = tgm.tag_group_id
LEFT JOIN tags AS parent_tag ON parent_tag.id = tg.parent_tag_id
LEFT JOIN tag_group_permissions tgp ON tgp.tag_group_id = tg.id AND tgp.permission_type = 3
LEFT JOIN groups g ON g.id = tgp.group_id

LEFT JOIN category_required_tag_groups AS crtg ON crtg.tag_group_id = tg.id
LEFT JOIN categories AS crtg_cat ON crtg.category_id = crtg_cat.id
LEFT JOIN category_tag_groups AS ctg ON ctg.tag_group_id = tg.id
LEFT JOIN categories AS ctg_cat ON ctg.category_id = ctg_cat.id
LEFT JOIN category_tags AS ctags ON ctags.tag_id = main.id
LEFT JOIN categories AS ctags_cat ON ctags.category_id = ctags_cat.id
LEFT JOIN not_allowed_tags AS nat ON nat.tag_id = main.id
LEFT JOIN tag_group_permissions tgp_use ON tgp_use.tag_group_id = tg.id AND tgp_use.permission_type = 1
LEFT JOIN groups g_use ON g_use.id = tgp_use.group_id

WHERE
  main.target_tag_id IS NULL AND
  (
    :tag_name IS NULL OR
    LOWER(main.name) LIKE LOWER('%' || :tag_name || '%') OR
    LOWER(syn.name) LIKE LOWER('%' || :tag_name || '%')
  ) AND
  (
    :tag_group IS NULL OR
    LOWER(tg.name) LIKE LOWER('%' || :tag_group || '%')
  )

GROUP BY
  main.id, main.name, tg.id, tg.name, parent_tag.name, tg.one_per_topic
ORDER BY main.name, tag_group_id

管理者は通常、使用が制限されていてもタグを使用できるため、あなたのケースで役立つかどうかはわかりません。しかし、試してみる価値はあると思ったので共有しました。