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migrations/Version20251016134343.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20251016134343 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('CREATE TABLE chapter_chapter (chapter_source INT NOT NULL, chapter_target INT NOT NULL, INDEX IDX_83B0B1614D498F8 (chapter_source), INDEX IDX_83B0B1611D31C877 (chapter_target), PRIMARY KEY(chapter_source, chapter_target)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB');
+        $this->addSql('ALTER TABLE chapter_chapter ADD CONSTRAINT FK_83B0B1614D498F8 FOREIGN KEY (chapter_source) REFERENCES chapter (id) ON DELETE CASCADE');
+        $this->addSql('ALTER TABLE chapter_chapter ADD CONSTRAINT FK_83B0B1611D31C877 FOREIGN KEY (chapter_target) REFERENCES chapter (id) ON DELETE CASCADE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE chapter_chapter DROP FOREIGN KEY FK_83B0B1614D498F8');
+        $this->addSql('ALTER TABLE chapter_chapter DROP FOREIGN KEY FK_83B0B1611D31C877');
+        $this->addSql('DROP TABLE chapter_chapter');
+    }
+}

src/DataFixtures/ChapterFixtures.php

@@ -23,6 +23,8 @@ public function load(ObjectManager $manager): void
         $chapter2->setSection($this->getReference(SectionFixtures::SEC_TWO_REFERENCE, Section::class));
         $chapter2->setCategory($this->getReference(CategoryFixtures::CAT_TWO_REFERENCE, Category::class));
 
+        $chapter1->addFollowingChapter($chapter2);
+
         $manager->persist($chapter1);
         $manager->persist($chapter2);
         $manager->flush();

src/Entity/Chapter.php

@@ -3,6 +3,8 @@
 namespace App\Entity;
 
 use App\Repository\ChapterRepository;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: ChapterRepository::class)]
@@ -21,6 +23,24 @@ class Chapter
     #[ORM\JoinColumn(nullable: false)]
     private ?Section $section = null;
 
+    /**
+     * @var Collection<int, self>
+     */
+    #[ORM\ManyToMany(targetEntity: self::class, inversedBy: 'previousChapters')]
+    private Collection $followingChapters;
+
+    /**
+     * @var Collection<int, self>
+     */
+    #[ORM\ManyToMany(targetEntity: self::class, mappedBy: 'followingChapters')]
+    private Collection $previousChapters;
+
+    public function __construct()
+    {
+        $this->followingChapters = new ArrayCollection();
+        $this->previousChapters = new ArrayCollection();
+    }
+
     public function getId(): ?int
     {
         return $this->id;
@@ -49,4 +69,55 @@ public function setSection(?Section $section): static
 
         return $this;
     }
+
+    /**
+     * @return Collection<int, self>
+     */
+    public function getFollowingChapters(): Collection
+    {
+        return $this->followingChapters;
+    }
+
+    public function addFollowingChapter(self $followingChapter): static
+    {
+        if (!$this->followingChapters->contains($followingChapter)) {
+            $this->followingChapters->add($followingChapter);
+        }
+
+        return $this;
+    }
+
+    public function removeFollowingChapter(self $followingChapter): static
+    {
+        $this->followingChapters->removeElement($followingChapter);
+
+        return $this;
+    }
+
+    /**
+     * @return Collection<int, self>
+     */
+    public function getPreviousChapters(): Collection
+    {
+        return $this->previousChapters;
+    }
+
+    public function addPreviousChapter(self $previousChapter): static
+    {
+        if (!$this->previousChapters->contains($previousChapter)) {
+            $this->previousChapters->add($previousChapter);
+            $previousChapter->addFollowingChapter($this);
+        }
+
+        return $this;
+    }
+
+    public function removePreviousChapter(self $previousChapter): static
+    {
+        if ($this->previousChapters->removeElement($previousChapter)) {
+            $previousChapter->removeFollowingChapter($this);
+        }
+
+        return $this;
+    }
 }