add tagging

src/Entity/Tag.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Uuid;
+
+#[ORM\Entity]
+#[ORM\Table(name: 'knowledge_tag')]
+#[ORM\Index(name: 'idx_knowledge_tag_slug', columns: ['slug'])]
+#[ORM\Index(name: 'idx_knowledge_tag_label', columns: ['label'])]
+class Tag
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'uuid', unique: true)]
+    private Uuid $id;
+
+    #[ORM\Column(length: 120, unique: true)]
+    private string $slug;
+
+    #[ORM\Column(length: 180)]
+    private string $label;
+
+    #[ORM\Column(type: 'text', nullable: true)]
+    private ?string $description = null;
+
+    #[ORM\Column]
+    private \DateTimeImmutable $createdAt;
+
+    public function __construct(string $slug, string $label, ?string $description = null)
+    {
+        $this->id = Uuid::v4();
+        $this->createdAt = new \DateTimeImmutable();
+
+        $this->slug = $slug;
+        $this->label = $label;
+        $this->description = $description;
+    }
+
+    public function getId(): Uuid
+    {
+        return $this->id;
+    }
+
+    public function getSlug(): string
+    {
+        return $this->slug;
+    }
+
+    public function setSlug(string $slug): static
+    {
+        $this->slug = $slug;
+        return $this;
+    }
+
+    public function getLabel(): string
+    {
+        return $this->label;
+    }
+
+    public function setLabel(string $label): static
+    {
+        $this->label = $label;
+        return $this;
+    }
+
+    public function getDescription(): ?string
+    {
+        return $this->description;
+    }
+
+    public function setDescription(?string $description): static
+    {
+        $this->description = $description;
+        return $this;
+    }
+
+    public function getCreatedAt(): \DateTimeImmutable
+    {
+        return $this->createdAt;
+    }
+}