Жизненный цикл объектов Doctrine

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--- a/src/Entity/Comment.php
+++ b/src/Entity/Comment.php
@@ -6,6 +6,7 @@ use App\Repository\CommentRepository;
 use Doctrine\ORM\Mapping as ORM;

 #[ORM\Entity(repositoryClass: CommentRepository::class)]
+#[ORM\HasLifecycleCallbacks]
 class Comment
 {
     #[ORM\Id]
@@ -90,6 +91,12 @@ class Comment
         return $this;
     }

+    #[ORM\PrePersist]
+    public function setCreatedAtValue()
+    {
+        $this->createdAt = new \DateTimeImmutable();
+    }
+
     public function getConference(): ?Conference
     {
         return $this->conference;

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--- a/migrations/Version00000000000000.php
+++ b/migrations/Version00000000000000.php
@@ -20,7 +20,9 @@ final class Version00000000000000 extends AbstractMigration
     public function up(Schema $schema): void
     {
         // this up() migration is auto-generated, please modify it to your needs
-        $this->addSql('ALTER TABLE conference ADD slug VARCHAR(255) NOT NULL');
+        $this->addSql('ALTER TABLE conference ADD slug VARCHAR(255)');
+        $this->addSql("UPDATE conference SET slug=CONCAT(LOWER(city), '-', year)");
+        $this->addSql('ALTER TABLE conference ALTER COLUMN slug SET NOT NULL');
     }

     public function down(Schema $schema): void

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--- a/src/Entity/Conference.php
+++ b/src/Entity/Conference.php
@@ -6,8 +6,10 @@ use App\Repository\ConferenceRepository;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;

 #[ORM\Entity(repositoryClass: ConferenceRepository::class)]
+#[UniqueEntity('slug')]
 class Conference
 {
     #[ORM\Id]
@@ -27,7 +29,7 @@ class Conference
     #[ORM\OneToMany(mappedBy: 'conference', targetEntity: Comment::class, orphanRemoval: true)]
     private $comments;

-    #[ORM\Column(type: 'string', length: 255)]
+    #[ORM\Column(type: 'string', length: 255, unique: true)]
     private $slug;

     public function __construct()

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--- a/src/Entity/Conference.php
+++ b/src/Entity/Conference.php
@@ -7,6 +7,7 @@ use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
+use Symfony\Component\String\Slugger\SluggerInterface;

 #[ORM\Entity(repositoryClass: ConferenceRepository::class)]
 #[UniqueEntity('slug')]
@@ -47,6 +48,13 @@ class Conference
         return $this->id;
     }

+    public function computeSlug(SluggerInterface $slugger)
+    {
+        if (!$this->slug || '-' === $this->slug) {
+            $this->slug = (string) $slugger->slug((string) $this)->lower();
+        }
+    }
+
     public function getCity(): ?string
     {
         return $this->city;

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--- a/config/services.yaml
+++ b/config/services.yaml
@@ -22,3 +22,7 @@ services:

     # add more service definitions when explicit configuration is needed
     # please note that last definitions always *replace* previous ones
+    App\EntityListener\ConferenceEntityListener:
+        tags:
+            - { name: 'doctrine.orm.entity_listener', event: 'prePersist', entity: 'App\Entity\Conference'}
+            - { name: 'doctrine.orm.entity_listener', event: 'preUpdate', entity: 'App\Entity\Conference'}

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--- a/src/Controller/ConferenceController.php
+++ b/src/Controller/ConferenceController.php
@@ -28,7 +28,7 @@ class ConferenceController extends AbstractController
         ]));
     }

-    #[Route('/conference/{id}', name: 'conference')]
+    #[Route('/conference/{slug}', name: 'conference')]
     public function show(Request $request, Conference $conference, CommentRepository $commentRepository): Response
     {
         $offset = max(0, $request->query->getInt('offset', 0));
--- a/templates/base.html.twig
+++ b/templates/base.html.twig
@@ -18,7 +18,7 @@
             <h1><a href="{{ path('homepage') }}">Guestbook</a></h1>
             <ul>
             {% for conference in conferences %}
-                <li><a href="{{ path('conference', { id: conference.id }) }}">{{ conference }}</a></li>
+                <li><a href="{{ path('conference', { slug: conference.slug }) }}">{{ conference }}</a></li>
             {% endfor %}
             </ul>
             <hr />
--- a/templates/conference/index.html.twig
+++ b/templates/conference/index.html.twig
@@ -8,7 +8,7 @@
     {% for conference in conferences %}
         <h4>{{ conference }}</h4>
         <p>
-            <a href="{{ path('conference', { id: conference.id }) }}">View</a>
+            <a href="{{ path('conference', { slug: conference.slug }) }}">View</a>
         </p>
     {% endfor %}
 {% endblock %}
--- a/templates/conference/show.html.twig
+++ b/templates/conference/show.html.twig
@@ -22,10 +22,10 @@
         {% endfor %}

         {% if previous >= 0 %}
-            <a href="{{ path('conference', { id: conference.id, offset: previous }) }}">Previous</a>
+            <a href="{{ path('conference', { slug: conference.slug, offset: previous }) }}">Previous</a>
         {% endif %}
         {% if next < comments|length %}
-            <a href="{{ path('conference', { id: conference.id, offset: next }) }}">Next</a>
+            <a href="{{ path('conference', { slug: conference.slug, offset: next }) }}">Next</a>
         {% endif %}
     {% else %}
         <div>No comments have been posted yet for this conference.</div>