WIP: preserve Issue #479 changes

backend/spec/requests/counts_table_spec.rb

@@ -262,7 +262,7 @@ RSpec.describe 'Counts table API', type: :request do
           tags: '', tags_json: [], parent_post_ids: '', created_at: Time.utc(2024, 3))
     end
     get '/counts/query', params: base.merge(mode: 'summary', rows: '', cols: 'title', sort: '')
-    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response).to have_http_status(:unprocessable_content)
     expect(response.parsed_body).to eq('error' => 'too_many_columns', 'max_columns' => 100)
   end
 

backend/spec/requests/error_responses_spec.rb

@@ -20,7 +20,7 @@ RSpec.describe 'error responses', type: :request do
 
       patch "/tags/#{ tag.id }", params: { category: 'nico' }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json).to include(
           'type' => 'validation_error',
           'message' => '入力内容を確認してください．',
@@ -37,7 +37,7 @@ RSpec.describe 'error responses', type: :request do
 
       put "/users/#{ user.id }", params: { name: 'a' * 256 }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json).to include(
           'type' => 'validation_error',
           'message' => '入力内容を確認してください．')

backend/spec/requests/gekanator_games_spec.rb

@@ -49,7 +49,7 @@ RSpec.describe 'Gekanator games API', type: :request do
           question_count: 4,
           answers: [{ question_id: 'tag:1', answer: 'no' }] }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'returns unauthorized without a user' do

backend/spec/requests/gekanator_learning_spec.rb

@@ -126,7 +126,7 @@ RSpec.describe 'Gekanator learning API', type: :request do
         }
       }.not_to change { GekanatorGame.count }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'stores a game result for a non-admin user' do
@@ -785,7 +785,7 @@ RSpec.describe 'Gekanator learning API', type: :request do
         }
       }.not_to change { GekanatorQuestionExample.count }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'rejects non-accepted questions' do
@@ -805,7 +805,7 @@ RSpec.describe 'Gekanator learning API', type: :request do
         ]
       }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'rejects non-post_similarity questions' do
@@ -829,7 +829,7 @@ RSpec.describe 'Gekanator learning API', type: :request do
         ]
       }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'allows a non-admin user to answer extra questions for their own game' do

backend/spec/requests/locale_write_paths_spec.rb

@@ -55,7 +55,7 @@ RSpec.describe 'Locale propagation on write paths', type: :request do
         deprecated: false, aliases: 'other_primary', parent_tags: '' }
 
     aggregate_failures do
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(other_primary.reload).to have_attributes(tag_id: other_tag.id, primary_flg: true)
       expect(TagName.where(tag: other_tag, language_code: 'ja', primary_flg: true))
           .to contain_exactly(other_primary)
@@ -289,7 +289,7 @@ RSpec.describe 'Locale propagation on write paths', type: :request do
           aliases: 'other_ainu_primary', parent_tags: '' }
 
       aggregate_failures do
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(other_primary.reload).to have_attributes(
             tag_id: other_tag.id, language_code: 'ain', primary_flg: true)
         expect(TagName.where(tag: other_tag, language_code: 'ain', primary_flg: true))

backend/spec/requests/materials_spec.rb

@@ -289,7 +289,7 @@ RSpec.describe 'Materials API', type: :request do
       it 'returns 422 when tag is blank' do
         post '/materials', params: { tag: '   ', file: dummy_upload }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to include(
             'tag' => ['タグは必須です．'])
       end
@@ -297,7 +297,7 @@ RSpec.describe 'Materials API', type: :request do
       it 'returns 422 when both file and url are blank' do
         post '/materials', params: { tag: 'material_create_blank' }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to include(
             'file' => ['ファイルまたは URL は必須です．'],
             'url' => ['ファイルまたは URL は必須です．'])
@@ -381,7 +381,7 @@ RSpec.describe 'Materials API', type: :request do
           file: dummy_upload
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
       end
 
       it 'persists url-only material' do
@@ -424,7 +424,7 @@ RSpec.describe 'Materials API', type: :request do
           }
         end.not_to change(Material, :count)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to include(
           'file' => ['抑止された素材です: copyright_high_risk']
         )
@@ -484,7 +484,7 @@ RSpec.describe 'Materials API', type: :request do
           file: dummy_upload
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to include(
             'tag' => ['タグは必須です．'])
       end
@@ -695,7 +695,7 @@ RSpec.describe 'Materials API', type: :request do
           file: dummy_upload(filename: 'blocked.png', body: 'blocked-update')
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(material.reload.file.blob.filename.to_s).to eq('old.png')
       end
     end

backend/spec/requests/nico_tags_spec.rb

@@ -218,7 +218,7 @@ RSpec.describe 'NicoTags', type: :request do
 
       patch "/tags/nico/#{nico_tag.id}", params: { tags: 'nico:linked_ng' }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
           'tags' => ['ニコニコ・タグ同士は連携できません．'])
     end
@@ -239,7 +239,7 @@ RSpec.describe 'NicoTags', type: :request do
 
       expect([Tag.count, TagName.count, TagVersion.count]).to eq(before_counts)
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors').fetch('tags')).to include(
           a_string_including('タグ名 “invalid”:', '名前に使用できない文字が含まれてゐます．'))
     end

backend/spec/requests/post_locale_filter_identity_spec.rb

@@ -48,7 +48,7 @@ RSpec.describe 'Post filter identity across locales', type: :request do
     primary_tag_name_for(tag, 'ja').update_columns(name: 'nico:shared')
     get '/posts/tag_filters', params: {
         locale: 'ja', target_locale: 'ain-Kana', tags: 'nico:shared' }
-    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response).to have_http_status(:unprocessable_content)
   end
 
   it 'rejects removed reference parameters instead of overriding the name' do

backend/spec/requests/posts_spec.rb

@@ -1042,7 +1042,7 @@ RSpec.describe 'Posts API', type: :request do
 
       get '/posts/metadata', params: { url: 'file:///etc/passwd' }
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to have_key('url')
     end
   end
@@ -1180,7 +1180,7 @@ RSpec.describe 'Posts API', type: :request do
         )
       }.not_to change(Post, :count)
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'thumbnail' => ['サムネイル画像の変換に失敗しました．']
       )
@@ -1219,7 +1219,7 @@ RSpec.describe 'Posts API', type: :request do
         thumbnail: dummy_upload
       )
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'tags' => ['廃止済みタグがあります: deprecated_direct_tag']
       )
@@ -1265,7 +1265,7 @@ RSpec.describe 'Posts API', type: :request do
         thumbnail: dummy_upload
       )
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json).to include(
         'type' => 'validation_error',
         'message' => '入力内容を確認してください．'
@@ -1333,7 +1333,7 @@ RSpec.describe 'Posts API', type: :request do
         thumbnail: dummy_upload
       )
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'video_ms' => ['タグ区間の終端が動画時間を超えてゐます．']
       )
@@ -1444,7 +1444,7 @@ RSpec.describe 'Posts API', type: :request do
         thumbnail: dummy_upload
       )
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'video_ms' => ['タグ区間の開始が動画時間以上です．']
       )
@@ -1465,7 +1465,7 @@ RSpec.describe 'Posts API', type: :request do
           thumbnail: dummy_upload
         )
 
-        expect(response).to have_http_status(:unprocessable_entity), response.body
+        expect(response).to have_http_status(:unprocessable_content), response.body
         expect(json).to include(
             'type' => 'validation_error',
             'message' => '入力内容を確認してください．',
@@ -1485,7 +1485,7 @@ RSpec.describe 'Posts API', type: :request do
             tags: 'spec_tag', # 既存タグ名を投げる
             thumbnail: dummy_upload)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
       end
     end
 
@@ -1499,7 +1499,7 @@ RSpec.describe 'Posts API', type: :request do
             tags: 'spec_tag', # 既存タグ名を投げる
             thumbnail: dummy_upload)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
       end
     end
 
@@ -1601,7 +1601,7 @@ RSpec.describe 'Posts API', type: :request do
               thumbnail: dummy_upload }
         }.not_to change(Post, :count)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to be_present
       end
     end
@@ -1620,7 +1620,7 @@ RSpec.describe 'Posts API', type: :request do
           )
         }.not_to change(Post, :count)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to be_present
       end
     end
@@ -1639,7 +1639,7 @@ RSpec.describe 'Posts API', type: :request do
           )
         }.not_to change(PostImplication, :count)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to be_present
       end
     end
@@ -1770,7 +1770,7 @@ RSpec.describe 'Posts API', type: :request do
         tags: 'deprecated_update_tag'
       )
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'tags' => ['廃止済みタグは付与できません．']
       )
@@ -1789,7 +1789,7 @@ RSpec.describe 'Posts API', type: :request do
             title: 'updated title',
             tags: 'nico:nico_tag')
 
-        expect(response).to have_http_status(:unprocessable_entity), response.body
+        expect(response).to have_http_status(:unprocessable_content), response.body
         expect(json).to include(
             'type' => 'validation_error',
             'message' => '入力内容を確認してください．',
@@ -1896,7 +1896,7 @@ RSpec.describe 'Posts API', type: :request do
             title: 'updated title',
             tags: 'spec_tag' }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to be_present
       end
     end
@@ -1922,7 +1922,7 @@ RSpec.describe 'Posts API', type: :request do
           parent_post_ids: 'abc'
         )
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(post_record.reload.parent_posts.pluck(:id)).to eq([parent_post.id])
       end
     end
@@ -1948,7 +1948,7 @@ RSpec.describe 'Posts API', type: :request do
           parent_post_ids: '999999999'
         )
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(post_record.reload.parent_posts.pluck(:id)).to eq([parent_post.id])
       end
     end
@@ -1964,7 +1964,7 @@ RSpec.describe 'Posts API', type: :request do
           parent_post_ids: post_record.id.to_s
         )
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
 
         expect(PostImplication.exists?(
           post_id: post_record.id,
@@ -2669,7 +2669,7 @@ RSpec.describe 'Posts API', type: :request do
             thumbnail: dummy_upload)
       end.not_to change(PostVersion, :count)
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'does not create a version when PUT /posts/:id is invalid' do
@@ -2685,7 +2685,7 @@ RSpec.describe 'Posts API', type: :request do
             original_created_before: Time.zone.local(2020, 1, 1, 0, 0, 0).iso8601)
       end.not_to change(PostVersion, :count)
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'rejects second-bearing original created timestamps on POST /posts' do
@@ -2698,7 +2698,7 @@ RSpec.describe 'Posts API', type: :request do
           thumbnail: dummy_upload,
           original_created_from: '2020-01-01T00:00:01Z')
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'original_created_from' => ['オリジナルの作成日時は分単位で入力してください．']
       )
@@ -2715,7 +2715,7 @@ RSpec.describe 'Posts API', type: :request do
           thumbnail: dummy_upload,
           original_created_before: '2020-01-01T00:00:00.123Z')
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'original_created_before' => ['オリジナルの作成日時は分単位で入力してください．']
       )
@@ -2733,7 +2733,7 @@ RSpec.describe 'Posts API', type: :request do
           original_created_from: '2020-01-01T00:00Z',
           original_created_before: '2020-01-01T00:00Z')
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'original_created_at' => ['オリジナルの作成日時の順番がをかしぃです．']
       )
@@ -2767,7 +2767,7 @@ RSpec.describe 'Posts API', type: :request do
           tags: 'spec_tag',
           original_created_from: 'not-a-time')
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
         'original_created_from' => ['オリジナルの作成日時の形式が不正です．']
       )

backend/spec/requests/tag_children_spec.rb

@@ -64,7 +64,7 @@ RSpec.describe "TagChildren", type: :request do
           do_request
         }.not_to change(TagImplication, :count)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(TagImplication.where(tag: child, parent_tag: parent)).not_to exist
       end
     end

backend/spec/requests/tag_descriptions_spec.rb

@@ -303,7 +303,7 @@ RSpec.describe 'Tag description native API', type: :request do
       headers
       before_state = stored_state
       native_write(body: '')
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json).to include('type' => 'validation_error',
                              'errors' => include('body' => a_kind_of(Array)))
       expect(stored_state).to eq(before_state)

backend/spec/requests/tag_group_locale_spec.rb

@@ -84,7 +84,7 @@ RSpec.describe 'Tag group locale contracts', type: :request do
     put "/wiki/#{ group.id }", params: {
         locale: 'ain-Kana', title: 'タググループ:partial rename', body: '- japanese_member' },
         headers: headers
-    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response).to have_http_status(:unprocessable_content)
     expect(group_state).to eq(before_state)
   end
 
@@ -117,7 +117,7 @@ RSpec.describe 'Tag group locale contracts', type: :request do
     expect(representation.fetch('members').sole.fetch('tag').fetch('name')).to be_nil
     expect(representation.fetch('placements').sole.fetch('tag').fetch('name')).to be_nil
     get "/wiki/#{ old_group.id }", params: { locale: 'ain-Kana', version: version.id }
-    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response).to have_http_status(:unprocessable_content)
     expect(response.body).not_to include('historical_japanese', 'current_ainu')
   end
 end

backend/spec/requests/tag_group_markdown_spec.rb

@@ -133,7 +133,7 @@ RSpec.describe 'Tag group Markdown round trips through the Wiki facade', type: :
 
     get group_title_path('混在構造')
 
-    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response).to have_http_status(:unprocessable_content)
     expect(group_rows('tag_groups', id:).sole.fetch('id')).to eq(id)
   end
 
@@ -142,7 +142,7 @@ RSpec.describe 'Tag group Markdown round trips through the Wiki facade', type: :
 
     get group_title_path('未配置構造')
 
-    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response).to have_http_status(:unprocessable_content)
     expect(group_rows('tag_groups', id:).sole.fetch('id')).to eq(id)
   end
 end

backend/spec/requests/tag_group_wiki_write_spec.rb

@@ -21,7 +21,7 @@ RSpec.describe 'Tag group Wiki facade writes', type: :request do
     before_state = group_state
     yield
     aggregate_failures do
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(group_state).to eq(before_state)
       expect(response.media_type).to eq('application/json')
       expect(response.body).not_to be_empty

backend/spec/requests/tag_group_write_integrity_spec.rb

@@ -27,7 +27,7 @@ RSpec.describe 'Tag group write integrity', type: :request do
   def expect_no_writes
     before_state = group_state
     yield
-    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response).to have_http_status(:unprocessable_content)
     expect(group_state).to eq(before_state)
   end
 

backend/spec/requests/tag_groups_spec.rb

@@ -148,7 +148,7 @@ RSpec.describe 'Tag group native API', type: :request do
           before_state = group_state
           native_write(operation, payload.merge(invalid))
           aggregate_failures do
-            expect(response).to have_http_status(:unprocessable_entity)
+            expect(response).to have_http_status(:unprocessable_content)
             expect(group_state).to eq(before_state)
           end
         end
@@ -158,7 +158,7 @@ RSpec.describe 'Tag group native API', type: :request do
         before_state = group_state
         invalid = [{ tag_id: tag.id, section_name: '不正', children: [] }]
         native_write(operation, payload.merge(placements: invalid))
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(group_state).to eq(before_state)
       end
 
@@ -167,7 +167,7 @@ RSpec.describe 'Tag group native API', type: :request do
         before_state = group_state
         native_write(operation, payload.merge(
             members: [{ tag_id: missing }], placements: [{ tag_id: missing, children: [] }]))
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(group_state).to eq(before_state)
       end
 
@@ -177,7 +177,7 @@ RSpec.describe 'Tag group native API', type: :request do
         native_write(operation, payload.merge(
             members: [{ tag_group_id: missing }],
             placements: [{ tag_group_id: missing, children: [] }]))
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(group_state).to eq(before_state)
       end
 
@@ -186,7 +186,7 @@ RSpec.describe 'Tag group native API', type: :request do
         6.times { nodes = [{ tag_id: tag.id, children: nodes }] }
         before_state = group_state
         native_write(operation, payload.merge(placements: nodes))
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(group_state).to eq(before_state)
       end
     end
@@ -206,7 +206,7 @@ RSpec.describe 'Tag group native API', type: :request do
       before_state = group_state
       native_write(:update, payload.merge(
           members: [{ tag_group_id: parent }], placements: []))
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(group_state).to eq(before_state)
     end
 
@@ -214,7 +214,7 @@ RSpec.describe 'Tag group native API', type: :request do
       before_state = group_state
       native_write(:update, payload.merge(
           members: [{ tag_group_id: group_id }], placements: []))
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(group_state).to eq(before_state)
     end
 

backend/spec/requests/tags_deerjikists_spec.rb

@@ -297,7 +297,7 @@ RSpec.describe 'Tags deerjikists API', type: :request do
             do_request
           }.not_to change { Deerjikist.where(tag: tag).map { |d| [d.platform, d.code] } }
 
-          expect(response).to have_http_status(:unprocessable_entity)
+          expect(response).to have_http_status(:unprocessable_content)
           expect(json).to include(
               'type' => 'validation_error',
               'message' => '入力内容を確認してください．',
@@ -321,7 +321,7 @@ RSpec.describe 'Tags deerjikists API', type: :request do
             do_request
           }.not_to change { Deerjikist.where(tag: tag).map { |d| [d.platform, d.code] } }
 
-          expect(response).to have_http_status(:unprocessable_entity)
+          expect(response).to have_http_status(:unprocessable_content)
           expect(json.fetch('errors')).to include(
             'deerjikists.0.platform' => [be_present],
           )
@@ -352,7 +352,7 @@ RSpec.describe 'Tags deerjikists API', type: :request do
             do_request
           }.not_to change { Deerjikist.order(:platform, :code).pluck(:platform, :code, :tag_id) }
 
-          expect(response).to have_http_status(:unprocessable_entity)
+          expect(response).to have_http_status(:unprocessable_content)
           expect(json.fetch('errors')).to include(
             'deerjikists.1.code' => [include('existing-deerjikist')],
           )

backend/spec/requests/tags_spec.rb

@@ -696,7 +696,7 @@ RSpec.describe 'Tags API', type: :request do
       it 'nico category への変更は 422 を返す' do
         patch "/tags/#{tag.id}", params: { name: 'new', category: 'nico' }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(primary_tag_name_for(tag.reload, 'ja').name).to eq('spec_tag')
         expect(tag.category).to eq('general')
       end
@@ -740,7 +740,7 @@ RSpec.describe 'Tags API', type: :request do
           patch "/tags/#{tag.id}", params: { category: 'nico' }
         }.not_to change(TagVersion, :count)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(tag.reload.category).to eq('general')
       end
 
@@ -824,7 +824,7 @@ RSpec.describe 'Tags API', type: :request do
 
         patch "/tags/#{ tag.id }", params: { name: 'unknown' }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to include(
           'name' => ['その名前は既に使はれてゐます．']
         )
@@ -840,7 +840,7 @@ RSpec.describe 'Tags API', type: :request do
 
         patch "/tags/#{ system_tag.id }", params: { name: 'patch_system_tag_renamed' }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(primary_tag_name_for(system_tag.reload, 'ja').name).to eq('bot操作')
       end
     end
@@ -1144,7 +1144,7 @@ RSpec.describe 'Tags API', type: :request do
           parent_tags: '',
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(primary_tag_name_for(tag.reload, 'ja').name).to eq('spec_tag')
       end
 
@@ -1156,7 +1156,7 @@ RSpec.describe 'Tags API', type: :request do
           parent_tags: '',
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(primary_tag_name_for(tag.reload, 'ja').name).to eq('spec_tag')
         expect(tag.category).to eq('general')
       end
@@ -1169,7 +1169,7 @@ RSpec.describe 'Tags API', type: :request do
           parent_tags: '',
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(json.fetch('errors')).to include(
           'deprecated' => ['廃止状態は必須です．']
         )
@@ -1366,7 +1366,7 @@ RSpec.describe 'Tags API', type: :request do
           }
         }.not_to change(TagVersion, :count)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
 
         expect(primary_tag_name_for(tag.reload, 'ja').name).to eq('spec_tag')
         expect(tag.category).to eq('general')
@@ -1387,7 +1387,7 @@ RSpec.describe 'Tags API', type: :request do
           }
         }.not_to change(TagVersion, :count)
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
 
         expect(primary_tag_name_for(system_tag.reload, 'ja').name).to eq(old_name)
         expect(system_tag.category).to eq(old_category)
@@ -1569,7 +1569,7 @@ RSpec.describe 'Tags API', type: :request do
           deprecated: '0',
         }
 
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
 
         expect(TagImplication.where(tag:, parent_tag: child)).not_to exist
       end

backend/spec/requests/theatre_comments_spec.rb

@@ -131,7 +131,7 @@ RSpec.describe 'TheatreComments', type: :request do
         post "/theatres/#{theatre.id}/comments", params: { content: '   ' }
       }.not_to change(TheatreComment, :count)
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'theatre が存在しなければ 404 を返す' do

backend/spec/requests/theatres_spec.rb

@@ -376,7 +376,7 @@ RSpec.describe 'Theatres API', type: :request do
         put "/theatres/#{theatre.id}/skip_vote", params: { post_id: 'invalid' }
       }.not_to change(TheatreSkipVote, :count)
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
     end
 
     it 'records a vote and returns the current vote status before majority' do

backend/spec/requests/user_settings_spec.rb

@@ -79,7 +79,7 @@ RSpec.describe 'user settings', type: :request do
 
       patch '/users/settings', params: { theme: 1 }, as: :json
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json).to include('type' => 'validation_error')
       expect(json.fetch('errors')).to include(
           'theme' => ['値の型が不正です．'])
@@ -90,7 +90,7 @@ RSpec.describe 'user settings', type: :request do
 
       patch '/users/settings', params: { theme: 'neon' }, as: :json
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json).to include('type' => 'validation_error')
       expect(json.fetch('errors').fetch('theme')).to be_present
     end

backend/spec/requests/user_theme_slots_spec.rb

@@ -84,7 +84,7 @@ RSpec.describe 'user theme slots', type: :request do
           params: { tokens: 'not-object' },
           as: :json
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
           'base_theme' => ['値が不正です．'])
     end
@@ -96,7 +96,7 @@ RSpec.describe 'user theme slots', type: :request do
           params: { tokens: 'not-object' },
           as: :json
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
           'tokens' => ['JSON object で指定してください．'])
     end

backend/spec/requests/users_spec.rb

@@ -119,7 +119,7 @@ RSpec.describe 'Users', type: :request do
           params: { name: '   ' },
           headers: auth_headers(user)
 
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(json.fetch('errors')).to include(
           'name' => ['名前は必須です．'])
     end

backend/spec/requests/wiki_creation_freeze_spec.rb

@@ -39,7 +39,7 @@ RSpec.describe 'Wiki creation freeze', type: :request do
       it "rejects invalid description body #{ body.inspect } atomically" do
         before_state = group_state
         put "/wiki/#{ page.id }", params: { title: tag.name('ja'), body: }, headers: headers
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
         expect(group_state).to eq(before_state)
       end
     end

backend/spec/requests/wiki_spec.rb

@@ -100,12 +100,12 @@ RSpec.describe 'Wiki API', type: :request do
     context 'when params invalid' do
       it 'returns 422 when title blank' do
         post endpoint, params: { title: '', body: 'Hello' }, headers: auth_headers(member)
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
       end
 
       it 'returns 422 when body blank' do
         post endpoint, params: { title: 'Test', body: '' }, headers: auth_headers(member)
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
       end
     end
 
@@ -160,7 +160,7 @@ RSpec.describe 'Wiki API', type: :request do
         put "/wiki/#{page.id}",
             params: { title: 'TestPage', body: '' },
             headers: auth_headers(member)
-        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_http_status(:unprocessable_content)
       end
     end
 

backend/spec/requests/wiki_title_collision_spec.rb

@@ -34,7 +34,7 @@ RSpec.describe 'Wiki title collision', type: :request do
         },
         headers: auth_headers(user)
 
-    expect(response).to have_http_status(:unprocessable_entity)
+    expect(response).to have_http_status(:unprocessable_content)
 
     source.reload
 

backend/spec/requests/wiki_unmigrated_contract_spec.rb

@@ -18,7 +18,7 @@ RSpec.describe 'Removed standalone Wiki resources', type: :request do
       before_state = group_state
       post '/wiki', params: { title:, body: 'body' },
            headers: cookie_headers(user)
-      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response).to have_http_status(:unprocessable_content)
       expect(group_state).to eq(before_state)
     end
   end