Use MapEntity for get Tag entity

Author: seb-jean

src/Controller/BlogController.php

@@ -49,14 +49,10 @@ final class BlogController extends AbstractController
     #[Route('/rss.xml', name: 'blog_rss', defaults: ['page' => '1', '_format' => 'xml'], methods: ['GET'])]
     #[Route('/page/{page}', name: 'blog_index_paginated', defaults: ['_format' => 'html'], requirements: ['page' => Requirement::POSITIVE_INT], methods: ['GET'])]
     #[Cache(smaxage: 10)]
+    #[MapEntity(expr: 'request.query.has("tag") ? repository.findOneBy({"name": request.query.get("tag")}) : null')]
+    ?Tag $tag
     public function index(Request $request, int $page, string $_format, PostRepository $posts, TagRepository $tags): Response
     {
-        $tag = null;
-
-        if ($request->query->has('tag')) {
-            $tag = $tags->findOneBy(['name' => $request->query->get('tag')]);
-        }
-
         $latestPosts = $posts->findLatest($page, $tag);
 
         // Every template name also has two extensions that specify the format and