Flash a notification when offering added

src/Controller/AppController.php

@@ -53,6 +53,9 @@ class AppController extends AbstractController
 
             $this->entityManager->persist($offering);
             $this->entityManager->flush();
+
+            $this->addFlash("success", "Successfully added the new offering!");
+            return $this->redirectToRoute('homepage');
         }
 
         return $this->render('app/new_listing.html.twig', [

templates/app/index.html.twig

@@ -2,6 +2,12 @@
 
 {% block body %}
 
+    {% for message in app.flashes('success') %}
+    <div class="alert alert-success" role="alert">
+        {{ message }}
+    </div>
+    {% endfor %}
+
     <h1>Offerings</h1>
     {% if offerings|length > 0 %}
         <div class="card-deck d-flex justify-content-around">