#45 完了

backend/app/controllers/wiki_pages_controller.rb

@@ -1,25 +1,10 @@
 class WikiPagesController < ApplicationController
   def show
-    wiki_page = WikiPage.find(params[:id])
-    return head :not_found unless wiki_page
-
-    render json: wiki_page.as_json.merge(body: wiki_page.body)
+    render_wiki_page_or_404 WikiPage.find(params[:id])
   end
 
   def show_by_title
-    title = params[:title]
-    version = params[:version].presence
-
-    wiki_page = WikiPage.find_by(title:)
-    return head :not_found unless wiki_page
-
-    wiki_page.sha = version
-
-    body = wiki_page.body
-    sha = wiki_page.sha
-    pred = wiki_page.pred
-    succ = wiki_page.succ
-    render json: wiki_page.as_json.merge(body:, sha:, pred:, succ:)
+    render_wiki_page_or_404 WikiPage.find_by(title: params[:title])
   end
 
   def diff
@@ -117,4 +102,16 @@ class WikiPagesController < ApplicationController
   def wiki
     @wiki ||= Gollum::Wiki.new(WIKI_PATH)
   end
+
+  def render_wiki_page_or_404 wiki_page
+    return head :not_found unless wiki_page
+
+    wiki_page.sha = params[:version].presence
+
+    body = wiki_page.body
+    sha = wiki_page.sha
+    pred = wiki_page.pred
+    succ = wiki_page.succ
+    render json: wiki_page.as_json.merge(body:, sha:, pred:, succ:)
+  end
 end