Implement snip tags with very elegant tags form

src/Form/SnipType.php

@@ -28,6 +28,7 @@ class SnipType extends AbstractType
                 'attr' => ['rows' => 20],
                 'mapped' => false,
             ])
+            ->add('tags', TagsType::class)
             ->add('public', SwitchType::class)
             ->add('visible', SwitchType::class)
         ;

src/Form/TagsType.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace App\Form;
+
+use App\Entity\Tag;
+use App\Repository\TagRepository;
+use Doctrine\Common\Collections\Collection;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class TagsType extends AbstractType implements DataTransformerInterface
+{
+    public function __construct(
+        private readonly TagRepository $repository,
+        private readonly Security      $security,
+    ) {}
+
+    public function transform($value): string
+    {
+        if ($value === null) {
+            return '';
+        }
+
+        if ($value instanceof Collection) {
+            $value = $value->toArray();
+        }
+
+        if (is_array($value)) {
+            $tags = array_map(fn(Tag $tag) => $tag->getName(), $value);
+        } else {
+            return '';
+        }
+        return implode(', ', $tags);
+    }
+
+    public function reverseTransform($value): array
+    {
+        $tags = array_filter(array_map('trim', explode(',', $value)));
+        $user = $this->security->getUser();
+
+        $tagEntities = [];
+        foreach ($tags as $tag) {
+            $tagEntity = $this->repository->findOneBy(['name' => $tag, 'user' => $user]);
+            if ($tagEntity === null) {
+                $tagEntity = new Tag()
+                    ->setName($tag)
+                    ->setUser($user)
+                ;
+                $this->repository->save($tagEntity);
+            }
+            $tagEntities[] = $tagEntity;
+        }
+
+        return $tagEntities;
+    }
+
+    public function buildForm(FormBuilderInterface $builder, array $options): void
+    {
+        $builder->addModelTransformer($this);
+    }
+
+    public function configureOptions(OptionsResolver $resolver): void
+    {
+        $resolver->setDefaults([
+            'data_class' => null, // No specific entity class
+            'label' => 'Tags (comma-separated)',
+            'attr' => ['class' => 'tags-input'], // Optional: Add custom attributes
+        ]);
+    }
+
+    public function getParent(): string
+    {
+        return TextType::class;
+    }
+}