feat: 上位タグのバグ修正（#174） (#175)

#174 エラー回避と誤記修正 #174 完了 Co-authored-by: miteruzo <miteruzo@naver.com> Reviewed-on: #175
2025-12-10 20:18:48 +09:00
parent d50a302d26
commit 3b32d4d8ac
4 changed files with 33 additions and 3 deletions
@@ -0,0 +1,27 @@
+class AddUniqueIndexToTagImplications < ActiveRecord::Migration[8.0]
+  def up
+    execute <<~SQL
+      DELETE
+        ti1
+      FROM
+        tag_implications ti1
+        INNER JOIN
+          tag_implications ti2
+          ON
+            ti1.tag_id = ti2.tag_id
+            AND ti1.parent_tag_id = ti2.parent_tag_id
+            AND ti1.id > ti2.id
+      ;
+    SQL
+
+    add_index :tag_implications, [:tag_id, :parent_tag_id],
+              unique: true,
+              name: 'index_tag_implications_on_tag_id_and_parent_tag_id'
+  end
+
+  def down
+    # NOTE: 重複削除は復元されなぃ．
+    remove_index :tag_implications,
+                 name: 'index_tag_implications_on_tag_id_and_parent_tag_id'
+  end
+end