#383

開発環境では、**DB を壊さない前提で、migration → API → 画面 → 同期 → ZIP → 履歴**の順に見るのがよいです。今回の差分は素材管理全体に触っているので、単体でチョンチョン見るより、素材の一生を通すのが早いです。

## 0. 先に方針

**やらないこと:**

```sh id="snb3i6"
rails db:drop
rails db:reset
rails db:setup
DISABLE_DATABASE_ENVIRONMENT_CHECK=1 ...
```

これは禁止。
開発 DB に本番データを入れているなら、床板を剥がして耐震確認するようなものです。

---

## 1. migration 確認

まず現在の状態を見る。

```sh id="qsdfpt"
cd backend
RAILS_ENV=development bundle exec rails db:migrate:status
```

その後、通常 migration。

```sh id="a89fir"
RAILS_ENV=development bundle exec rails db:migrate
```

見るポイント:

```txt id="c1u57a"
materials に source_* / normalized_source_key / version_no がある
material_versions に event_type / file snapshot / source snapshot がある
material_export_items がある
material_sync_suppressions がある
material_sync_sources がある
既存 materials に material_versions version_no=1 create が backfill されている
```

確認用:

```sh id="g4vd4m"
RAILS_ENV=development bundle exec rails runner '
puts "materials=#{Material.count}"
puts "versions=#{MaterialVersion.count}"
puts "materials without versions=#{Material.left_joins(:material_versions).where(material_versions: { id: nil }).count}"
puts "sync suppressions table=#{ActiveRecord::Base.connection.table_exists?(:material_sync_suppressions)}"
'
```

ここで `materials without versions=0` になれば、backfill は通っています。

---

## 2. 既存素材一覧の画面確認

フロントを起動して `/materials` を見る。

```sh id="vl28jd"
cd frontend
npm run dev
```

見る観点:

```txt id="i2ovxw"
初期表示で素材が出る
初期表示ではグルーピングがオフ
タグなし素材も出る
カード表示でサムネまたは代替テキストが出る
一覧表示に切り替えられる
q / tag_state / media_kind / sort / direction が効く
```

ここでまず、普通の素材一覧が壊れていないことを確認します。

---

## 3. 左タグバーの確認

`/materials` を開いて左タグバーからタグを選ぶ。

見る観点:

```txt id="n6udul"
URL が tag_id=...&include_descendants=1&group_by=parent_tag になる
選択中タグが左バーで強調される
一覧上部に「選択中」の表示が出る
「タグ選択を解除」で通常表示に戻れる
解除後、tag_id / include_descendants / group_by / page が消える
子タグ・孫タグの素材も一覧に出る
親タググルーピングされる
```

特に重要なのはこれ。

```txt id="d33os0"
親タグ A を選択
  A に直接紐づく素材
  A > B に紐づく素材
  A > B > C に紐づく素材
が同じ一覧に出ること
```

---

## 4. 選択タグから素材追加

左タグからタグを選択した状態で、一覧上部の **このタグに素材を追加** を押す。

見る観点:

```txt id="qdd5uw"
素材追加画面の tag 欄に選択中タグ名が初期入力されている
file または url を指定して保存できる
保存後 return_to で元のタグ選択済み一覧に戻る
戻った一覧に追加した素材が出る
material_versions に create が 1 件できる
```

Rails console でも確認できます。

```sh id="i07rrb"
RAILS_ENV=development bundle exec rails runner '
m = Material.order(id: :desc).first
puts({ id: m.id, tag: m.tag&.name, versions: m.material_versions.count, version_no: m.version_no }.inspect)
'
```

---

## 5. グループ見出しから素材追加

親タググルーピング表示中に、各グループ見出しの **このタグに素材を追加** を押す。

見る観点:

```txt id="fpx8w4"
グループタグ名が tag 欄に初期入力される
保存後、元の一覧に戻る
追加素材がそのグループ内に出る
```

ここは今回の導線の肝です。棚の見出しから直接その棚へ素材を置けるかを見る。

---

## 6. 素材更新と履歴

既存素材の詳細または編集導線から、タグ・URL・ファイル・export path を更新する。

見る観点:

```txt id="w36i61"
更新前 snapshot が無ければ create が補われる
更新後 update version ができる
file_blob_id / file_filename / file_sha256 が material_versions に入る
export_paths_json が履歴に残る
/materials/changes または /materials/versions で履歴が見える
```

console:

```sh id="a3okhv"
RAILS_ENV=development bundle exec rails runner '
m = Material.order(updated_at: :desc).first
puts m.material_versions.order(:version_no).map { |v|
  [v.version_no, v.event_type, v.tag_name, v.file_filename, v.file_sha256, v.export_paths_hash]
}.inspect
'
```

---

## 7. サムネイル

画像素材を追加して、一覧にサムネイルが出るか確認。

動画素材があるなら、`ffmpeg` が入っている環境で backfill。

```sh id="qxm8fj"
cd backend
RAILS_ENV=development bundle exec rails materials:thumbnails:backfill
```

見る観点:

```txt id="s9a1vf"
画像は 180x180 のサムネが付く
動画はフレームからサムネが作られる
非対応ファイルは代替テキスト表示になる
ログに result が出る
```

---

## 8. ZIP export

export path がある素材を用意して、ブラウザで確認。

```txt id="aq7f7o"
/materials/download.zip?profile=legacy_drive
```

見る観点:

```txt id="h4rve5"
ZIP が落ちる
entry path が material_export_items.export_path になる
disabled な export item は入らない
ファイル実体が欠けている場合は 422 と missing_files が返る
```

---

## 9. 抑止

`/materials/suppressions` で path prefix 抑止を追加する。

見る観点:

```txt id="w80jbu"
member で作成できる
guest は forbidden / unauthorized
google_drive_path_prefix で既存素材が discard される
discard 履歴が material_versions に残る
同期時に同じ source_path 配下が再作成されない
```

---

## 10. Google Drive 同期

開発環境では、まず小さいフォルダでやるのがよいです。
いきなり本番素材集フォルダを食わせると、ログが藪になります 🌿

必要な ENV:

```sh id="kzbb7f"
GOOGLE_DRIVE_SERVICE_ACCOUNT_EMAIL=...
GOOGLE_DRIVE_PRIVATE_KEY_PATH=...
MATERIAL_SYNC_SOURCE_KIND=google_drive_path
MATERIAL_SYNC_SOURCE_FILE_ID=<folder_id>
MATERIAL_SYNC_SOURCE_NAME=dev-small-folder
MATERIAL_SYNC_SOURCE_PROFILE=legacy_drive
```

seed で source 作成、または console で作成。

```sh id="sec40c"
RAILS_ENV=development bundle exec rails db:seed
RAILS_ENV=development bundle exec rails materials:sync
```

見る観点:

```txt id="a5ltqu"
imported / updated / unchanged / suppressed / failed がログに出る
2 回目実行で unchanged が増える
tag は nil のままでも保存できる
人手で tag / url を付けた既存同期素材が、再同期で消えない
Google native file は skip される
download 後 sha256 block が効く
```

---

## 11. schema.rb は別途確認

これはテストというより merge gate です。
今回まだ怪しいので、差分に以下が混ざっていないことを確認します。

```txt id="s3k6da"
wiki_assets 削除
wiki_pages.next_asset_no 削除
素材管理と無関係な CHECK constraint 削除
素材管理と無関係な index order 消失
```

ここが残るなら、機能テストが通っても merge は止めた方がいいです。

---

## 最小テスト順

時間がないなら、この順で十分です。

```txt id="c1k2pw"
1. db:migrate
2. materials without versions = 0 を確認
3. /materials 初期表示
4. 左タグ選択 → 子孫込み表示 → グルーピング
5. タグ選択解除
6. 選択タグから素材追加 → return_to で戻る
7. グループ見出しから素材追加
8. 更新して material_versions を確認
9. ZIP export
10. 小さい Drive folder で materials:sync を 2 回
```

これで、今回の差分の主要な導線はほぼ踏めます。

Reviewed-on: #381
Co-authored-by: miteruzo <miteruzo@naver.com>
Co-committed-by: miteruzo <miteruzo@naver.com>

backend/app/controllers/tags_controller.rb

@@ -245,10 +245,7 @@ class TagsController < ApplicationController
     return render_unprocessable_entity('カテゴリは必須です．', field: :category) if category.blank?
     return render_unprocessable_entity '廃止状態は必須です．', field: :deprecated unless params.key?(:deprecated)
 
-    if (name != tag.name &&
-        tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico]))
-      return render_unprocessable_entity 'システム・タグの名称は変更できません．', field: :name
-    end
+    return unless validate_tag_rename(tag, name)
 
     alias_names = params[:aliases].to_s.split.uniq
     parent_names = params[:parent_tags].to_s.split.uniq
@@ -274,7 +271,7 @@ class TagsController < ApplicationController
       else
         tag.update!(category:, deprecated_at: deprecated ? Time.current : nil)
       end
-      tag.tag_name.update!(name:)
+      rename_tag_name!(tag, name) if name_changed
 
       alias_names << old_name if name_changed
       alias_names.delete(name)
@@ -310,6 +307,8 @@ class TagsController < ApplicationController
       return render_unprocessable_entity 'ニコタグは廃止できません．', field: :deprecated
     end
 
+    return unless validate_tag_rename(tag, name)
+
     if tag.nico? || (category.present? && category == 'nico')
       return render_unprocessable_entity 'ニコタグは変更できません．', field: :category
     end
@@ -321,7 +320,7 @@ class TagsController < ApplicationController
       name_changed = name.present? && name != old_name
       wiki_page = tag.tag_name.wiki_page if name_changed
 
-      tag.tag_name.update!(name:) if name.present?
+      rename_tag_name!(tag, name) if name_changed
       tag.update!(category:) if category.present?
       if deprecated_given && tag.deprecated? != deprecated
         tag.update!(deprecated_at: deprecated ? Time.current : nil)
@@ -535,6 +534,67 @@ class TagsController < ApplicationController
         created_by_user:)
   end
 
+  def validate_tag_rename tag, name
+    return true if name.blank? || name == tag.name
+
+    if tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico])
+      render_unprocessable_entity 'システム・タグの名称は変更できません．', field: :name
+      return false
+    end
+
+    target_tag_name = TagName.with_discarded.find_by(name:)
+    return true if target_tag_name.nil?
+    return true if target_tag_name.canonical_id?
+
+    render_unprocessable_entity 'その名前は既に使はれてゐます．', field: :name
+    false
+  end
+
+  def rename_tag_name! tag, name
+    return if name == tag.name
+
+    current_tag_name = tag.tag_name
+    target_tag_name = TagName.with_discarded.find_by(name:)
+
+    if target_tag_name.nil?
+      current_tag_name.update!(name:)
+      return
+    end
+
+    promote_tag_alias!(
+        tag,
+        current_tag_name:,
+        promoted_tag_name: target_tag_name)
+  end
+
+  def promote_tag_alias! tag, current_tag_name:, promoted_tag_name:
+    old_owner_tag = promoted_tag_name.canonical&.tag
+
+    if old_owner_tag && old_owner_tag != tag
+      TagVersioning.ensure_snapshot!(old_owner_tag, created_by_user: current_user)
+    end
+
+    promoted_tag_name.undiscard! if promoted_tag_name.discarded?
+    promoted_tag_name.update!(canonical: nil)
+
+    TagName.with_discarded
+           .where(canonical_id: current_tag_name.id)
+           .where.not(id: promoted_tag_name.id)
+           .find_each do |alias_tag_name|
+      alias_tag_name.update!(canonical: promoted_tag_name)
+    end
+
+    current_tag_name.wiki_page&.update!(tag_name: promoted_tag_name)
+    tag.update!(tag_name: promoted_tag_name)
+    current_tag_name.association(:wiki_page).reset
+    current_tag_name.association(:tag).reset
+    current_tag_name.reload.update!(canonical: promoted_tag_name)
+
+    return unless old_owner_tag && old_owner_tag != tag
+
+    record_tag_version!(old_owner_tag.reload, event_type: :update, created_by_user: current_user)
+  end
+
   def update_aliases! tag, alias_names
     alias_names = alias_names.uniq
 

backend/app/services/google_drive/api_client.rb

@@ -26,13 +26,19 @@ module GoogleDrive
 
     def list_material_files_under_folder folder_id
       files = []
+      each_material_file_under_folder(folder_id) { |entry| files << entry }
+      files
+    end
+
+    def each_material_file_under_folder folder_id
+      return enum_for(__method__, folder_id) unless block_given?
+
       walk_folder(folder_id, nil) do |entry, relative_path|
         next if entry['mimeType'] == FOLDER_MIME_TYPE
         next if native_file?(entry['mimeType'])
 
-        files << build_file_entry(entry, relative_path)
+        yield build_file_entry(entry, relative_path)
       end
-      files
     end
 
     def fetch_material_file file_id
@@ -44,9 +50,10 @@ module GoogleDrive
 
     def download_to_tempfile file_id, filename:
       tempfile = Tempfile.new(['material-sync', File.extname(filename.to_s)])
+      tempfile.binmode
       request_binary("/files/#{ file_id }",
                      { alt: 'media', supportsAllDrives: true }) do |chunk|
-        tempfile.write(chunk)
+        tempfile.write(chunk.b)
       end
       tempfile.rewind
       tempfile
@@ -139,7 +146,7 @@ module GoogleDrive
         end
 
         response.read_body do |chunk|
-          yield chunk
+          yield chunk.b
         end
       end
     end

backend/app/services/material_sync_runner.rb

@@ -21,10 +21,14 @@ class MaterialSyncRunner
     result = Result.new(imported: 0, updated: 0, unchanged: 0,
                         suppressed: 0, failed: 0, errors: [])
 
-    candidates.each do |candidate|
-      next if candidate.blank?
+    if @source.source_kind == 'google_drive_path'
+      sync_google_drive_path!(result)
+    else
+      candidates.each do |candidate|
+        next if candidate.blank?
 
-      sync_candidate!(candidate, result)
+        sync_candidate!(candidate, result)
+      end
     end
 
     @source.update!(last_synced_at: Time.current)
@@ -43,8 +47,6 @@ class MaterialSyncRunner
     case @source.source_kind
     when 'uri'
       [uri_candidate]
-    when 'google_drive_path'
-      google_drive_path_candidates
     when 'google_drive_file'
       [google_drive_file_candidate]
     when 'legacy_drive_path'
@@ -104,12 +106,25 @@ class MaterialSyncRunner
   def google_drive_path_candidates
     folder_id = google_drive_folder_id
     Enumerator.new do |entries|
-      drive_client.list_material_files_under_folder(folder_id).each do |entry|
+      drive_client.each_material_file_under_folder(folder_id).each do |entry|
         entries << build_google_drive_candidate(entry)
       end
     end
   end
 
+  def sync_google_drive_path! result
+    folder_id = google_drive_folder_id
+    scanned_count = 0
+
+    drive_client.each_material_file_under_folder(folder_id) do |entry|
+      scanned_count += 1
+      sync_candidate!(build_google_drive_candidate(entry), result)
+      log_google_drive_progress(folder_id, scanned_count, result) if progress_log_scan_count?(scanned_count)
+    end
+
+    log_google_drive_progress(folder_id, scanned_count, result, summary: true)
+  end
+
   def google_drive_file_candidate
     entry = drive_client.fetch_material_file(google_drive_file_id)
     return nil unless entry
@@ -213,6 +228,22 @@ class MaterialSyncRunner
                                         failed: result.failed))
   end
 
+  def progress_log_scan_count? scanned_count
+    scanned_count == 1 || (scanned_count % 50).zero?
+  end
+
+  def log_google_drive_progress folder_id, scanned_count, result, summary: false
+    Rails.logger.info(
+        material_sync_log(folder_id:,
+                          scanned_count:,
+                          imported: result.imported,
+                          updated: result.updated,
+                          unchanged: result.unchanged,
+                          suppressed: result.suppressed,
+                          failed: result.failed,
+                          progress: summary ? 'summary' : 'scan'))
+  end
+
   def material_sync_log fields
     { material_sync_source_id: @source.id,
       material_sync_source_name: @source.name }.merge(fields).to_json

backend/spec/requests/tags_spec.rb

@@ -581,6 +581,58 @@ RSpec.describe 'Tags API', type: :request do
         expect(response).to have_http_status(:ok)
         expect(wiki_page.reload.wiki_versions.count).to eq(before_wiki_version_count)
       end
+
+      it 'full update で旧名 alias が残った tag を PATCH で旧名へ戻せる' do
+        put "/tags/#{ tag.id }", params: {
+          name: 'patch_roundtrip_target',
+          category: 'general',
+          aliases: 'unko',
+          parent_tags: '',
+          deprecated: '0',
+        }
+
+        expect(response).to have_http_status(:ok)
+        expect(TagName.find_by!(name: 'spec_tag').canonical).to eq(tag.reload.tag_name)
+
+        patch "/tags/#{ tag.id }", params: { name: 'spec_tag' }
+
+        expect(response).to have_http_status(:ok)
+
+        tag.reload
+
+        expect(tag.name).to eq('spec_tag')
+        expect(tag.tag_name.canonical_id).to be_nil
+        expect(TagName.find_by!(name: 'patch_roundtrip_target').canonical).to eq(tag.tag_name)
+      end
+
+      it '別 tag の正規名には変更できない' do
+        wiki_page =
+            Wiki::Commit.create_content!(
+                tag_name: tag.tag_name,
+                body: 'patch collision wiki',
+                created_by_user: member_user,
+                message: 'init')
+
+        patch "/tags/#{ tag.id }", params: { name: 'unknown' }
+
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(json.fetch('errors')).to include(
+          'name' => ['その名前は既に使はれてゐます．']
+        )
+
+        expect(tag.reload.name).to eq('spec_tag')
+        expect(tag.tag_name.aliases.map(&:name)).to contain_exactly('unko')
+        expect(wiki_page.reload.tag_name).to eq(tag.tag_name)
+      end
+
+      it 'system tag の name は変更できない' do
+        system_tag = Tag.bot
+
+        patch "/tags/#{ system_tag.id }", params: { name: 'patch_system_tag_renamed' }
+
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(system_tag.reload.name).to eq('bot操作')
+      end
     end
   end
 
@@ -1029,6 +1081,42 @@ RSpec.describe 'Tags API', type: :request do
         expect(versions.second.created_by_user_id).to eq(member_user.id)
       end
 
+      it '同じ tag の旧 alias へ戻しても rename できる' do
+        put "/tags/#{ tag.id }", params: {
+          name: 'put_roundtrip_b',
+          category: 'general',
+          aliases: 'unko',
+          parent_tags: '',
+          deprecated: '0',
+        }
+
+        expect(response).to have_http_status(:ok)
+
+        put "/tags/#{ tag.id }", params: {
+          name: 'spec_tag',
+          category: 'general',
+          aliases: 'unko',
+          parent_tags: '',
+          deprecated: '0',
+        }
+
+        expect(response).to have_http_status(:ok)
+
+        tag.reload
+
+        expect(tag.name).to eq('spec_tag')
+        expect(TagName.find_by!(name: 'put_roundtrip_b').canonical).to eq(tag.tag_name)
+        expect(tag.tag_name.aliases.map(&:name)).to contain_exactly('put_roundtrip_b', 'unko')
+        expect(tag.tag_name.aliases.map(&:name)).not_to include('spec_tag')
+        expect(alias_tn.reload.canonical).to eq(tag.tag_name)
+
+        version = tag.tag_versions.order(:version_no).last
+
+        expect(version.event_type).to eq('update')
+        expect(version.name).to eq('spec_tag')
+        expect(version.aliases.split).to contain_exactly('put_roundtrip_b', 'unko')
+      end
+
       it 'parent tag の snapshot も作成する' do
         old_parent = Tag.create!(
           tag_name: TagName.create!(name: 'put_snapshot_old_parent'),
@@ -1153,6 +1241,48 @@ RSpec.describe 'Tags API', type: :request do
         )
       end
 
+      it 'wiki を持つ tag を旧 alias へ戻しても wiki を新 canonical へ移す' do
+        wiki_page =
+            Wiki::Commit.create_content!(
+                tag_name: tag.tag_name,
+                body: 'wiki body before',
+                created_by_user: member_user,
+                message: 'init')
+
+        expect {
+          put "/tags/#{ tag.id }", params: {
+            name: 'put_wiki_roundtrip_b',
+            category: 'general',
+            aliases: 'unko',
+            parent_tags: '',
+            deprecated: '0',
+          }
+
+          put "/tags/#{ tag.id }", params: {
+            name: 'spec_tag',
+            category: 'general',
+            aliases: 'unko',
+            parent_tags: '',
+            deprecated: '0',
+          }
+        }
+            .to change(TagVersion, :count).by(3)
+            .and change(WikiVersion, :count).by(2)
+
+        expect(response).to have_http_status(:ok)
+
+        tag.reload
+
+        expect(wiki_page.reload.tag_name).to eq(tag.tag_name)
+        expect(TagName.find_by!(name: 'put_wiki_roundtrip_b').wiki_page).to be_nil
+        expect(TagName.find_by!(name: 'put_wiki_roundtrip_b').canonical).to eq(tag.tag_name)
+
+        versions = wiki_page.wiki_versions.order(:version_no).last(2)
+
+        expect(versions.map(&:event_type)).to eq(['update', 'update'])
+        expect(versions.map(&:title)).to eq(['put_wiki_roundtrip_b', 'spec_tag'])
+      end
+
       it '別名を他 tag から奪った場合、奪はれた側の tag version も作成する' do
         old_owner = Tag.create!(
           tag_name: TagName.create!(name: 'put_alias_old_owner'),
@@ -1191,6 +1321,48 @@ RSpec.describe 'Tags API', type: :request do
         expect(old_owner_versions.second.aliases.split).not_to include('put_stolen_alias')
       end
 
+      it '別 tag の alias 名を rename で奪へる' do
+        old_owner = Tag.create!(
+          tag_name: TagName.create!(name: 'put_alias_collision_owner'),
+          category: :general
+        )
+        stolen_alias = TagName.create!(
+          name: 'put_alias_collision_name',
+          canonical: old_owner.tag_name
+        )
+        wiki_page =
+            Wiki::Commit.create_content!(
+                tag_name: tag.tag_name,
+                body: 'put collision wiki',
+                created_by_user: member_user,
+                message: 'init')
+
+        put "/tags/#{ tag.id }", params: {
+          name: 'put_alias_collision_name',
+          category: 'general',
+          aliases: 'unko',
+          parent_tags: '',
+          deprecated: '0',
+        }
+
+        expect(response).to have_http_status(:ok)
+
+        tag.reload
+        old_owner.reload
+        stolen_alias.reload
+
+        expect(tag.name).to eq('put_alias_collision_name')
+        expect(stolen_alias.canonical_id).to be_nil
+        expect(TagName.find_by!(name: 'spec_tag').canonical).to eq(tag.tag_name)
+        expect(old_owner.tag_name.aliases.map(&:name)).not_to include('put_alias_collision_name')
+
+        old_owner_versions = old_owner.tag_versions.order(:version_no)
+
+        expect(old_owner_versions.last.event_type).to eq('update')
+        expect(old_owner_versions.last.aliases.split).not_to include('put_alias_collision_name')
+        expect(wiki_page.reload.tag_name).to eq(tag.tag_name)
+      end
+
       it 'parent_tags に指定すると循環する tag は 422 にする' do
         pending '#332 で対応予定'
 

backend/spec/services/material_sync_runner_spec.rb

@@ -0,0 +1,89 @@
+require 'rails_helper'
+
+RSpec.describe MaterialSyncRunner do
+  let(:user) { create(:user, :member) }
+  let(:source) do
+    MaterialSyncSource.create!(
+        name: 'Drive source',
+        source_kind: 'google_drive_path',
+        source_file_id: 'folder-123',
+        profile: 'legacy_drive',
+        created_by_user: user,
+        updated_by_user: user)
+  end
+  let(:drive_client) { instance_double(GoogleDrive::ApiClient) }
+
+  describe '#sync!' do
+    it 'imports google drive path candidates as they are yielded' do
+      first_entry = { id: 'file-1',
+                      name: 'a.png',
+                      mime_type: 'image/png',
+                      relative_path: '素材/a.png',
+                      sha256_checksum: 'sha-a',
+                      web_view_link: 'https://drive.google.com/file/d/file-1/view',
+                      web_content_link: nil }
+      second_entry = { id: 'file-2',
+                       name: 'b.png',
+                       mime_type: 'image/png',
+                       relative_path: '素材/b.png',
+                       sha256_checksum: 'sha-b',
+                       web_view_link: 'https://drive.google.com/file/d/file-2/view',
+                       web_content_link: nil }
+      yielded = []
+
+      allow(GoogleDrive::ApiClient).to receive(:new).and_return(drive_client)
+      allow(drive_client).to receive(:each_material_file_under_folder) do |folder_id, &block|
+        expect(folder_id).to eq('folder-123')
+        block.call(first_entry)
+        expect(yielded).to eq(['素材/a.png'])
+        block.call(second_entry)
+      end
+      allow(MaterialSyncImporter).to receive(:import!) do |candidate|
+        yielded << candidate.fetch(:source_path)
+        instance_double(MaterialSyncImporter::Result,
+                        action: yielded.last == '素材/a.png' ? :imported : :updated)
+      end
+
+      result = described_class.new(source).sync!
+
+      expect(yielded).to eq(['素材/a.png', '素材/b.png'])
+      expect(result.imported).to eq(1)
+      expect(result.updated).to eq(1)
+      expect(result.unchanged).to eq(0)
+      expect(source.reload.last_synced_at).to be_present
+    end
+
+    it 'logs google drive path progress at first item and summary' do
+      entry = { id: 'file-1',
+                name: 'a.png',
+                mime_type: 'image/png',
+                relative_path: '素材/a.png',
+                sha256_checksum: 'sha-a',
+                web_view_link: 'https://drive.google.com/file/d/file-1/view',
+                web_content_link: nil }
+      logged = []
+
+      allow(GoogleDrive::ApiClient).to receive(:new).and_return(drive_client)
+      allow(drive_client).to receive(:each_material_file_under_folder) do |_folder_id, &block|
+        block.call(entry)
+      end
+      allow(MaterialSyncImporter).to receive(:import!)
+        .and_return(instance_double(MaterialSyncImporter::Result, action: :imported))
+      allow(Rails.logger).to receive(:info) { |message| logged << JSON.parse(message) }
+
+      described_class.new(source).sync!
+
+      progress_logs = logged.select { |row| row['folder_id'] == 'folder-123' }
+      expect(progress_logs.map { |row| row['progress'] }).to eq(['scan', 'summary'])
+      expect(progress_logs.last).to include(
+          'material_sync_source_id' => source.id,
+          'material_sync_source_name' => 'Drive source',
+          'scanned_count' => 1,
+          'imported' => 1,
+          'updated' => 0,
+          'unchanged' => 0,
+          'suppressed' => 0,
+          'failed' => 0)
+    end
+  end
+end

frontend/src/components/TopNav.tsx

@@ -55,15 +55,16 @@ export const menuOutline = (
 	    visible: tagFlg },
 	  { name: '履歴', to: `/tags/changes?id=${ tag?.id }`,
 	    visible: tagFlg && tag?.category !== 'nico' }] },
-      { name: '素材', to: '/materials', visible: false, subMenu: [
+      { name: '素材', to: '/materials', visible: true, subMenu: [
 	  { name: '一覧', to: '/materials' },
 	  { name: '追加', to: '/materials/new' },
+	  { name: '抑止', to: '/materials/suppressions' },
 	  { name: '全体履歴', to: '/materials/changes' },
 	  { name: 'ヘルプ', to: '/wiki/ヘルプ:素材管理' },
 	  { component: <Separator/>, visible: materialFlg },
 	  { name: `広場 (${ postCount || 0 })`,
 	    to: `/posts?tags=${ encodeURIComponent (material?.tag?.name ?? '') }`,
-	    visible: materialFlg },
+	    visible: materialFlg && Boolean (material?.tag) },
 	  { name: '履歴', to: `/materials/changes?material_id=${ material?.id }`,
 	    visible: materialFlg }] },
       { name: 'Wiki', to: '/wiki/ヘルプ:ホーム', base: '/wiki', subMenu: [

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -127,17 +127,12 @@ const MaterialDetailPage: FC = () => {
 		      <audio src={material.file} controls/>)))}
 
 	      <TabGroup>
-		<Tab name="Wiki">
-		  {material.tag
-		   ? (
+		{material.tag && (
+		    <Tab name="Wiki">
 		      <WikiBody
 			  title={material.tag.name}
-			  body={material.wikiPageBody ?? undefined}/>)
-		   : (
-		      <p className="text-stone-700 dark:text-stone-300">
-			タグ未設定の素材です．
-		      </p>)}
-		</Tab>
+			  body={material.wikiPageBody ?? undefined}/>
+		    </Tab>)}
 
 		<Tab name="編輯">
 		  <div className="max-w-wl space-y-4 pt-2">

frontend/src/pages/materials/MaterialListPage.test.tsx

@@ -34,10 +34,6 @@ describe ('MaterialListPage', () => {
       )
     })
     expect (await screen.findByText ('素材はありません。')).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: '新規素材を追加' })).toHaveAttribute (
-        'href',
-        '/materials/new',
-    )
   })
 
   it ('shows materials in the default card view', async () => {

frontend/src/pages/materials/MaterialListPage.tsx

@@ -10,7 +10,7 @@ import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
 import Pagination from '@/components/common/Pagination'
 import MainArea from '@/components/layout/MainArea'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
 import { fetchMaterials, parseMaterialFilter } from '@/lib/materials'
 import { materialsKeys } from '@/lib/queryKeys'
 import { dateString, inputClass } from '@/lib/utils'
@@ -41,16 +41,16 @@ const MEDIA_FILTER_LABELS: Record<MaterialIndexMediaKind, string> = {
     video:      '動画',
     audio:      '音声',
     file_other: 'その他ファイル',
-    url_only:   'URL のみ'}
+    url_only:   '外部リンクのみ'}
 
 const SORT_LABELS: Record<MaterialIndexSort, string> = {
     created_at:     '作成日時',
     updated_at:     '更新日時',
     tag_name:       'タグ名',
     media_kind:     '種類',
-    file_byte_size: 'ファイルサイズ',
-    version_no:     'バージョン',
-    id:             'ID'}
+    file_byte_size: '容量',
+    version_no:     '版',
+    id:             'Id.'}
 
 
 const setIf = (qs: URLSearchParams, key: string, value: string | null) => {
@@ -118,7 +118,7 @@ const MaterialThumb: FC<{ material: Material }> = ({ material }) => (
 		    text-stone-900 shadow-sm dark:border-stone-700 dark:bg-stone-900
 		    dark:text-stone-100`}>
       {material.thumbnail
-       ? <img src={material.thumbnail} alt="" className="h-full w-full object-contain"/>
+       ? <img src={material.thumbnail} alt="" className="block h-full w-full object-cover"/>
        : (
 	  <span
 	      className="px-2 text-2xl leading-tight"
@@ -409,21 +409,8 @@ const MaterialListPage: FC = () => {
 	  <div className="flex flex-wrap items-center justify-between gap-3">
 	    <PageTitle className="my-auto">素材管理</PageTitle>
 	    <div className="flex flex-wrap gap-2">
-	      <PrefetchLink
-		  to="/materials/new"
-		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
-			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
-			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
-		新規素材を追加
-	      </PrefetchLink>
-	      <PrefetchLink
-		  to="/materials/suppressions"
-		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
-			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
-			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
-		同期元抑止
-	      </PrefetchLink>
-	      <a
+	      {/* TODO: 局所出力を可能にする */}
+	      {/* <a
 		  href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}
 		  target="_blank"
 		  rel="noopener noreferrer"
@@ -431,7 +418,7 @@ const MaterialListPage: FC = () => {
 			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
 			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
 		ZIP をダウンロード
-	      </a>
+	      </a> */}
 	    </div>
 	  </div>
 

frontend/src/pages/materials/MaterialSyncSuppressionsPage.tsx

@@ -2,17 +2,13 @@ import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
-import PrefetchLink from '@/components/PrefetchLink'
 import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
-import {
-    createMaterialSyncSuppression,
-    fetchMaterialSyncSuppressions,
-} from '@/lib/materials'
+import { createMaterialSyncSuppression, fetchMaterialSyncSuppressions } from '@/lib/materials'
 import { materialsKeys } from '@/lib/queryKeys'
 import { dateString, inputClass } from '@/lib/utils'
 
@@ -22,11 +18,11 @@ import type { MaterialSyncSuppressionSourceKind } from '@/types'
 
 const SOURCE_KIND_LABELS: Record<MaterialSyncSuppressionSourceKind, string> = {
     uri:               'URI',
-    google_drive_path: 'Google Drive path',
-    google_drive_path_prefix: 'Google Drive path prefix',
-    google_drive_file: 'Google Drive file ID',
-    legacy_drive_path: 'Legacy Drive path',
-    legacy_drive_path_prefix: 'Legacy Drive path prefix'}
+    google_drive_path: 'Google Drive ファイル',
+    google_drive_path_prefix: 'Google Drive フォルダ',
+    google_drive_file: 'Google Drive ファイル Id.',
+    legacy_drive_path: '汎用ファイル',
+    legacy_drive_path_prefix: '汎用フォルダ' }
 
 const REASONS = [
     'copyright_high_risk',
@@ -36,7 +32,23 @@ const REASONS = [
     'malware_or_dangerous_file',
     'duplicate_or_low_quality',
     'source_owner_request',
-    'other']
+    'other'] as const
+
+type MaterialSyncSuppressionReason = typeof REASONS[number]
+
+const REASON_NAMES: Record<MaterialSyncSuppressionReason, string> = {
+    ['copyright_high_risk']: '著作権への懸念',
+    ['copyright_takedown']: '著作者からの申出',
+    ['adult_or_sensitive']: '成人向け',
+    ['personal_information']: '個人情報',
+    ['malware_or_dangerous_file']: '危険なソフトウェア',
+    ['duplicate_or_low_quality']: '重複',
+    ['source_owner_request']: '同期元管理者からの申出',
+    ['other']: 'その他' } as const
+
+
+const reasonName = (reason: string): string =>
+    REASON_NAMES[reason as MaterialSyncSuppressionReason] ?? reason
 
 
 const MaterialSyncSuppressionsPage: FC = () => {
@@ -46,7 +58,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
   const [sourceUri, setSourceUri] = useState ('')
   const [drivePath, setDrivePath] = useState ('')
   const [driveFileId, setDriveFileId] = useState ('')
-  const [reason, setReason] = useState (REASONS[0])
+  const [reason, setReason] = useState<MaterialSyncSuppressionReason> (REASONS[0])
 
   const { data, isError, isLoading } = useQuery ({
       queryKey: materialsKeys.suppressions (),
@@ -82,18 +94,11 @@ const MaterialSyncSuppressionsPage: FC = () => {
   return (
       <MainArea>
 	<Helmet>
-	  <title>{`同期元抑止 | ${ SITE_TITLE }`}</title>
+	  <title>{`素材同期抑止 | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
 	<div className="space-y-5">
-	  <div className="flex flex-wrap items-center justify-between gap-3">
-	    <PageTitle>同期元抑止</PageTitle>
-	    <PrefetchLink
-		to="/materials"
-		className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
-	      素材一覧へ戻る
-	    </PrefetchLink>
-	  </div>
+	  <PageTitle>同期抑止</PageTitle>
 
 	  <form
 	      onSubmit={handleSubmit}
@@ -115,7 +120,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 		    </select>)}
 	      </FormField>
 
-	      <FormField label="Source URI">
+	      <FormField label="同期元 URI">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -124,7 +129,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="Drive path">
+	      <FormField label="Google Drive パス">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -133,7 +138,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="Drive file ID">
+	      <FormField label="Google Drive ファイル Id.">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -142,15 +147,15 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="理由">
+	      <FormField label="事由">
 		{({ invalid }) => (
 		    <select
 			value={reason}
-			onChange={e => setReason (e.target.value)}
+			onChange={e => setReason (e.target.value as MaterialSyncSuppressionReason)}
 			className={inputClass (invalid)}>
 		      {REASONS.map (value => (
 			  <option key={value} value={value}>
-			    {value}
+			    {REASON_NAMES[value]}
 			  </option>))}
 		    </select>)}
 	      </FormField>
@@ -185,7 +190,8 @@ const MaterialSyncSuppressionsPage: FC = () => {
 		    {suppression.normalizedSourceKey}
 		  </div>
 		  <div className="mt-2 text-sm text-stone-600 dark:text-stone-400">
-		    理由: {suppression.reason} / 登録: {dateString (suppression.createdAt)}
+		    事由: {reasonName (suppression.reason)} /
+		    登録: {dateString (suppression.createdAt)}
 		  </div>
 		</article>))}
 	  </div>