From e3e9efe68462853c1570b5059f2e79d54301e383 Mon Sep 17 00:00:00 2001
From: Codex Night Worker <codex-night@localhost>
Date: Fri, 13 Nov 2026 12:40:14 +0900
Subject: [PATCH] AI: address review on PR #458

---
 backend/spec/requests/tags_spec.rb | 44 +++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/backend/spec/requests/tags_spec.rb b/backend/spec/requests/tags_spec.rb
index 7a66889..39bc0d5 100644
--- a/backend/spec/requests/tags_spec.rb
+++ b/backend/spec/requests/tags_spec.rb
@@ -482,6 +482,7 @@ RSpec.describe 'Tags API', type: :request do
         create(:tag, category: :general, primary_name: name, post_count: 1)
         create(:external_tag, name:, post_count: 1)
       end
+      create(:external_tag, name: 'suffix_combined', post_count: 100)
 
       get '/tags/autocomplete', params: { q: 'combined' }
 
@@ -490,6 +491,39 @@ RSpec.describe 'Tags API', type: :request do
       expect(json.map { |row| row.fetch('name') }).to eq(expected.first(20))
     end
 
+    it 'appends primary, alias, and external suffix matches without duplicate resources' do
+      prefix = create(:tag, primary_name: 'tail', post_count: 1)
+      create(:tag_name, :alias, name: 'tail_alias', tag: prefix)
+      create(:tag_name, :alias, name: 'alias_tail', tag: prefix)
+      create(:tag, primary_name: 'primary_tail', post_count: 4)
+      alias_target = create(:tag, primary_name: 'alias_target', post_count: 3)
+      create(:tag_name, :alias, name: 'suffix_tail', tag: alias_target)
+      external = create(:external_tag, id: prefix.id, name: 'external_tail', post_count: 5)
+      create(:tag, primary_name: 'middle_tail_only', post_count: 100)
+      create(:external_tag, name: 'middle_tail_only', post_count: 100)
+
+      get '/tags/autocomplete', params: { q: 'tail' }
+
+      expect(response).to have_http_status(:ok)
+      expect(json.map { |row| row.fetch('name') }).to eq(
+          ['tail', 'nico:external_tail', 'primary_tail', 'alias_target'])
+      expect(json.first.fetch('matched_alias')).to eq('tail_alias')
+      expect(json.last.fetch('matched_alias')).to eq('suffix_tail')
+      expect(json[1]).to include('id' => external.id, 'category' => 'nico')
+    end
+
+    it 'fills only the remaining places with suffix matches' do
+      names = 19.times.map { |number| "capacity_#{ number.to_s.rjust(2, '0') }" }
+      names.each { create(:tag, primary_name: _1, post_count: 1) }
+      create(:tag, primary_name: 'first_capacity', post_count: 3)
+      create(:external_tag, name: 'second_capacity', post_count: 2)
+
+      get '/tags/autocomplete', params: { q: 'capacity' }
+
+      expect(response).to have_http_status(:ok)
+      expect(json.map { |row| row.fetch('name') }).to eq(names + ['first_capacity'])
+    end
+
     it 'excludes external tags but preserves internal alias matches when nico is false' do
       internal = create(:tag, category: :general, primary_name: 'switch_internal', post_count: 1)
       alias_target = create(:tag, category: :general, primary_name: 'alias_target', post_count: 1)
@@ -518,12 +552,20 @@ RSpec.describe 'Tags API', type: :request do
         create(:external_tag, name: literal, post_count: 1)
         create(:tag, category: :general, primary_name: 'literalXmatch', post_count: 2)
         create(:external_tag, name: 'literalXmatch', post_count: 2)
+        suffix = "suffix_literal#{ wildcard }"
+        create(:tag, primary_name: suffix, post_count: 1)
+        suffix_alias = create(:tag, primary_name: 'suffix_alias_target', post_count: 1)
+        create(:tag_name, :alias, name: "alias_#{ suffix }", tag: suffix_alias)
+        create(:external_tag, name: suffix, post_count: 1)
+        create(:tag, primary_name: 'suffix_literalX', post_count: 2)
+        create(:external_tag, name: 'suffix_literalX', post_count: 2)
 
         get '/tags/autocomplete', params: { q: "literal#{ wildcard }" }
 
         expect(json.map { |row| row.fetch('name') })
             .to contain_exactly(
-                literal, primary_tag_name_for(alias_target, 'ja').name, "nico:#{ literal }")
+                literal, primary_tag_name_for(alias_target, 'ja').name, "nico:#{ literal }",
+                suffix, 'suffix_alias_target', "nico:#{ suffix }")
       end
     end