Configure the database schema

src/Entity/Comment.php

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+<?php
+
+namespace App\Entity;
+
+use App\Repository\CommentRepository;
+use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity(repositoryClass: CommentRepository::class)]
+class Comment
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    private ?int $id = null;
+
+    #[ORM\Column(length: 255)]
+    private ?string $author = null;
+
+    #[ORM\Column(type: Types::TEXT)]
+    private ?string $text = null;
+
+    #[ORM\Column(length: 255)]
+    private ?string $email = null;
+
+    #[ORM\Column]
+    private ?\DateTimeImmutable $createdAt = null;
+
+    #[ORM\ManyToOne(inversedBy: 'comments')]
+    #[ORM\JoinColumn(nullable: false)]
+    private ?Conference $conference = null;
+
+    #[ORM\Column(length: 255, nullable: true)]
+    private ?string $photoFilename = null;
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getAuthor(): ?string
+    {
+        return $this->author;
+    }
+
+    public function setAuthor(string $author): static
+    {
+        $this->author = $author;
+
+        return $this;
+    }
+
+    public function getText(): ?string
+    {
+        return $this->text;
+    }
+
+    public function setText(string $text): static
+    {
+        $this->text = $text;
+
+        return $this;
+    }
+
+    public function getEmail(): ?string
+    {
+        return $this->email;
+    }
+
+    public function setEmail(string $email): static
+    {
+        $this->email = $email;
+
+        return $this;
+    }
+
+    public function getCreatedAt(): ?\DateTimeImmutable
+    {
+        return $this->createdAt;
+    }
+
+    public function setCreatedAt(\DateTimeImmutable $createdAt): static
+    {
+        $this->createdAt = $createdAt;
+
+        return $this;
+    }
+
+    public function getConference(): ?Conference
+    {
+        return $this->conference;
+    }
+
+    public function setConference(?Conference $conference): static
+    {
+        $this->conference = $conference;
+
+        return $this;
+    }
+
+    public function getPhotoFilename(): ?string
+    {
+        return $this->photoFilename;
+    }
+
+    public function setPhotoFilename(?string $photoFilename): static
+    {
+        $this->photoFilename = $photoFilename;
+
+        return $this;
+    }
+}

src/Entity/Conference.php

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+<?php
+
+namespace App\Entity;
+
+use App\Repository\ConferenceRepository;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity(repositoryClass: ConferenceRepository::class)]
+class Conference
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    private ?int $id = null;
+
+    #[ORM\Column(length: 255)]
+    private ?string $city = null;
+
+    #[ORM\Column(length: 4)]
+    private ?string $year = null;
+
+    #[ORM\Column]
+    private ?bool $isInternational = null;
+
+    /**
+     * @var Collection<int, Comment>
+     */
+    #[ORM\OneToMany(targetEntity: Comment::class, mappedBy: 'conference', orphanRemoval: true)]
+    private Collection $comments;
+
+    public function __construct()
+    {
+        $this->comments = new ArrayCollection();
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getCity(): ?string
+    {
+        return $this->city;
+    }
+
+    public function setCity(string $city): static
+    {
+        $this->city = $city;
+
+        return $this;
+    }
+
+    public function getYear(): ?string
+    {
+        return $this->year;
+    }
+
+    public function setYear(string $year): static
+    {
+        $this->year = $year;
+
+        return $this;
+    }
+
+    public function isInternational(): ?bool
+    {
+        return $this->isInternational;
+    }
+
+    public function setInternational(bool $isInternational): static
+    {
+        $this->isInternational = $isInternational;
+
+        return $this;
+    }
+
+    /**
+     * @return Collection<int, Comment>
+     */
+    public function getComments(): Collection
+    {
+        return $this->comments;
+    }
+
+    public function addComment(Comment $comment): static
+    {
+        if (!$this->comments->contains($comment)) {
+            $this->comments->add($comment);
+            $comment->setConference($this);
+        }
+
+        return $this;
+    }
+
+    public function removeComment(Comment $comment): static
+    {
+        if ($this->comments->removeElement($comment)) {
+            // set the owning side to null (unless already changed)
+            if ($comment->getConference() === $this) {
+                $comment->setConference(null);
+            }
+        }
+
+        return $this;
+    }
+}

src/Repository/CommentRepository.php

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+<?php
+
+namespace App\Repository;
+
+use App\Entity\Comment;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * @extends ServiceEntityRepository<Comment>
+ */
+class CommentRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, Comment::class);
+    }
+
+    //    /**
+    //     * @return Comment[] Returns an array of Comment objects
+    //     */
+    //    public function findByExampleField($value): array
+    //    {
+    //        return $this->createQueryBuilder('c')
+    //            ->andWhere('c.exampleField = :val')
+    //            ->setParameter('val', $value)
+    //            ->orderBy('c.id', 'ASC')
+    //            ->setMaxResults(10)
+    //            ->getQuery()
+    //            ->getResult()
+    //        ;
+    //    }
+
+    //    public function findOneBySomeField($value): ?Comment
+    //    {
+    //        return $this->createQueryBuilder('c')
+    //            ->andWhere('c.exampleField = :val')
+    //            ->setParameter('val', $value)
+    //            ->getQuery()
+    //            ->getOneOrNullResult()
+    //        ;
+    //    }
+}

src/Repository/ConferenceRepository.php

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+<?php
+
+namespace App\Repository;
+
+use App\Entity\Conference;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * @extends ServiceEntityRepository<Conference>
+ */
+class ConferenceRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, Conference::class);
+    }
+
+    //    /**
+    //     * @return Conference[] Returns an array of Conference objects
+    //     */
+    //    public function findByExampleField($value): array
+    //    {
+    //        return $this->createQueryBuilder('c')
+    //            ->andWhere('c.exampleField = :val')
+    //            ->setParameter('val', $value)
+    //            ->orderBy('c.id', 'ASC')
+    //            ->setMaxResults(10)
+    //            ->getQuery()
+    //            ->getResult()
+    //        ;
+    //    }
+
+    //    public function findOneBySomeField($value): ?Conference
+    //    {
+    //        return $this->createQueryBuilder('c')
+    //            ->andWhere('c.exampleField = :val')
+    //            ->setParameter('val', $value)
+    //            ->getQuery()
+    //            ->getOneOrNullResult()
+    //        ;
+    //    }
+}