Implementing Eloquent Polymorphic Relationships

// In your migration for comments/tags (example: comments table)
Schema::create('comments', function (Blueprint $table) {
    $table->id();
    $table->text('body');
    $table->morphTo('commentable'); // Adds commentable_id and commentable_type
    $table->timestamps();
});

// In your App\Models\Comment model
namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    /**
     * Get the parent commentable model (post or video).
     */
    public function commentable()
    {
        return $this->morphTo();
    }
}

// In your App\Models\Post model
namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    /**
     * Get all of the post's comments.
     */
    public function comments()
    {
        return $this->morphMany(Comment::class, 'commentable');
    }
}

// In your App\Models\Video model
namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Video extends Model
{
    /**
     * Get all of the video's comments.
     */
    public function comments()
    {
        return $this->morphMany(Comment::class, 'commentable');
    }
}

// Usage example
$post = App\Models\Post::find(1);
foreach ($post->comments as $comment) {
    echo $comment->body;
}

$video = App\Models\Video::find(1);
$comment = $video->comments()->create(['body' => 'Great video!']);

$comment = App\Models\Comment::find(1);
$commentable = $comment->commentable; // Can be a Post or a Video instance