feat: Wiki 有無判定軽量化（#233） (#234)

#233 Backend が対応できてなかったのでそっちも対応させた．

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #234

backend/spec/requests/posts_spec.rb

@@ -54,9 +54,9 @@ RSpec.describe 'Posts API', type: :request do
       # 全postの全tagが name を含むこと
       expect(posts).not_to be_empty
       posts.each do |p|
-        expect(p["tags"]).to be_an(Array)
-        p["tags"].each do |t|
-          expect(t).to include("name", "category")
+        expect(p['tags']).to be_an(Array)
+        p['tags'].each do |t|
+          expect(t).to include('name', 'category', 'has_wiki')
         end
       end
       expect(json['count']).to be_an(Integer)
@@ -71,11 +71,19 @@ RSpec.describe 'Posts API', type: :request do
         get "/posts", params: { tags: "spec_tag" }
 
         expect(response).to have_http_status(:ok)
-        ids = json.fetch("posts").map { |p| p["id"] }
+        posts = json.fetch('posts')
+        ids = posts.map { |p| p['id'] }
 
         expect(ids).to include(hit_post.id)
         expect(ids).not_to include(miss_post.id)
         expect(json['count']).to be_an(Integer)
+
+        posts.each do |p|
+          expect(p['tags']).to be_an(Array)
+          p['tags'].each do |t|
+            expect(t).to include('name', 'category', 'has_wiki')
+          end
+        end
       end
 
       it "returns empty posts when nothing matches" do
@@ -104,7 +112,7 @@ RSpec.describe 'Posts API', type: :request do
 
         # show は build_tag_tree_for を使うので、tags はツリー形式（children 付き）
         node = json['tags'][0]
-        expect(node).to include('id', 'name', 'category', 'post_count', 'children')
+        expect(node).to include('id', 'name', 'category', 'post_count', 'children', 'has_wiki')
         expect(node['name']).to eq('spec_tag')
 
         expect(json).to have_key('related')