From f6517c52c917a653c3b648c521a0df621457a535 Mon Sep 17 00:00:00 2001
From: miteruzo <miteruzo@naver.com>
Date: Sat, 7 Mar 2026 09:36:30 +0900
Subject: [PATCH] =?UTF-8?q?#106=20=E3=82=A8=E3=83=A9=E3=83=BC=E5=AF=BE?=
 =?UTF-8?q?=E5=BF=9C?=
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---
 backend/lib/tasks/sync_nico.rake | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/backend/lib/tasks/sync_nico.rake b/backend/lib/tasks/sync_nico.rake
index dd1b7b3..9d1b2af 100644
--- a/backend/lib/tasks/sync_nico.rake
+++ b/backend/lib/tasks/sync_nico.rake
@@ -93,10 +93,15 @@ namespace :nico do
         sync_post_tags!(post, [Tag.tagme.id, Tag.bot.id, Tag.niconico.id, Tag.video.id])
       end
 
-      kept_ids = post.tags.pluck(:id).to_set
-      kept_non_nico_ids = post.tags.not_nico.pluck(:id).to_set
+      post_tags = post.tags
+      # 既存のタグ Id. 集合
+      kept_ids = post_tags.pluck(:id).to_set
+      # うち内部タグ Id. 集合
+      kept_non_nico_ids = post_tags.not_nico.pluck(:id).to_set
 
+      # 記載すべき外部タグ Id. のリスト
       desired_nico_ids = []
+      # 記載すべき内部タグ Id. のリスト
       desired_non_nico_ids = []
 
       datum['tags'].each do |raw|
@@ -114,7 +119,7 @@ namespace :nico do
       if deerjikist
         desired_non_nico_ids << deerjikist.tag_id
         desired_nico_ids << deerjikist.tag_id
-      elsif !(Tag.where(id: desired_all_ids).where(category: :deerjikist).exists?)
+      elsif !(Tag.where(id: kept_non_nico_ids).where(category: :deerjikist).exists?)
         desired_non_nico_ids << Tag.no_deerjikist.id
         desired_nico_ids << Tag.no_deerjikist.id
       end