Refactor code for improved readability and consistency; add flash message handling and enhance quiz functionality

src/Entity/Elimination.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Entity;
+
+use App\Repository\EliminationRepository;
+use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\IdGenerator\UuidGenerator;
+use Symfony\Bridge\Doctrine\Types\UuidType;
+use Symfony\Component\Uid\Uuid;
+
+#[ORM\Entity(repositoryClass: EliminationRepository::class)]
+class Elimination
+{
+    #[ORM\Id]
+    #[ORM\Column(type: UuidType::NAME, unique: true)]
+    #[ORM\GeneratedValue(strategy: 'CUSTOM')]
+    #[ORM\CustomIdGenerator(class: UuidGenerator::class)]
+    private ?Uuid $id = null;
+
+    #[ORM\Column(type: Types::JSON)]
+    private array $data = [];
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getData(): array
+    {
+        return $this->data;
+    }
+
+    public function setData(array $data): static
+    {
+        $this->data = $data;
+
+        return $this;
+    }
+}

src/Entity/Question.php

@@ -96,4 +96,23 @@ class Question
 
         return $this;
     }
+
+    public function getErrors(): ?string
+    {
+        if (0 === \count($this->answers)) {
+            return 'This question has no answers';
+        }
+
+        $correctAnswers = $this->answers->filter(static fn (Answer $answer): ?bool => $answer->isRightAnswer())->count();
+
+        if (0 === $correctAnswers) {
+            return 'This question has no correct answers';
+        }
+
+        if ($correctAnswers > 1) {
+            return 'This question has multiple correct answers';
+        }
+
+        return null;
+    }
 }