Posts by categories OK

src/Controller/PostsController.php

@@ -44,11 +44,12 @@ class PostsController extends AppController
         $this->set('_serialize', ['post']);
     }
 
-    public function list($category_id) {
+    public function byCategory($category_id) {
         $posts = $this->Posts->find()->where(['category_id' => $category_id]);
-        $category = $this->Posts->Categories->get()
+        $category = $this->Posts->Categories->get($category_id);
 
         $this->set('posts', $posts);
+        $this->set('category', $category);
         $this->set('_serialize', ['posts']);
     }
 

src/Template/Posts/by_category.ctp

@@ -0,0 +1,11 @@
+<div class="row">
+    <h5>Posts in relation with <?= $category->name ?></h5>
+    <ul>
+        <?php foreach($posts as $post): ?>
+            <li>
+                <h6><?= $post->title ?></h6>
+                <p><?= $post->body ?></p>
+            </li>
+        <?php endforeach; ?>
+    </ul>
+</div>