Add polymorphic relationship

Signed-off-by: Mior Muhammad Zaki <crynobone@gmail.com>

Author: crynobone

app/Http/Resources/PostResource.php

@@ -14,6 +14,7 @@ class PostResource extends JsonApiResource
     protected array $relationships = [
         'comments',
         'user',
+        'tags',
     ];
 
     /**

app/Models/Post.php

@@ -6,6 +6,7 @@
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphToMany;
 
 class Post extends Model
 {
@@ -27,4 +28,12 @@ public function user(): BelongsTo
     {
         return $this->belongsTo(User::class);
     }
+
+    /**
+     * Get all of the tags for the post.
+     */
+    public function tags(): MorphToMany
+    {
+        return $this->morphToMany(Tag::class, 'taggable')->withPivot('notes')->using(Taggable::class);
+    }
 }

app/Models/Tag.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphToMany;
+
+class Tag extends Model
+{
+    /** @use HasFactory<\Database\Factories\TagFactory> */
+    use HasFactory;
+
+    /**
+     * Get all of the posts that are assigned this tag.
+     */
+    public function posts(): MorphToMany
+    {
+        return $this->morphedByMany(Post::class, 'taggable')->withPivot('notes')->using(Taggable::class);
+    }
+}

app/Models/Taggable.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Relations\MorphPivot;
+
+class Taggable extends MorphPivot
+{
+    //
+}

database/factories/TagFactory.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Database\Factories;
+
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\Tag>
+ */
+class TagFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'name' => $this->faker->word(),
+        ];
+    }
+}

database/migrations/2025_11_07_132826_create_tags_table.php

@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('tags', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->timestamps();
+        });
+
+        Schema::create('taggables', function (Blueprint $table) {
+            $table->foreignId('tag_id');
+            $table->foreignId('taggable_id');
+            $table->string('taggable_type');
+            $table->string('notes')->nullable();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('tags');
+        Schema::dropIfExists('taggables');
+    }
+};

database/seeders/DatabaseSeeder.php

@@ -5,6 +5,7 @@
 use App\Enums\TeamRole;
 use App\Models\Comment;
 use App\Models\Post;
+use App\Models\Tag;
 use App\Models\Team;
 use App\Models\User;
 use App\Models\UserProfile;
@@ -46,5 +47,10 @@ public function run(): void
             'post_id' => $posts->first()->getKey(),
             'user_id' => $user->getKey(),
         ]);
+
+        $openSourceTag = Tag::factory()->create(['name' => 'Open Source']);
+        $forgeTag = Tag::factory()->create(['name' => 'Forge']);
+
+        $posts->first()->tags()->attach([$openSourceTag]);
     }
 }