Laravel automatically create unique slug on model created.

Post.php

<?php

namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    use HasFactory, UniqueSlug;

    protected $fillable = [
        'title','slug'
    ];

    /**
     * Boot the model.
     */

    protected static function boot()
    {
        parent::boot();

        static::created(function ($post) {
            $post->slug = $post->createSlug($post->title);
            $post->save();
        });
    }
}

UniqueSlug.php

<?php

use Illuminate\Support\Str;

trait UniqueSlug
{
    public function createSlug($name): string
    {
        if (static::withTrashed()->whereSlug($slug = Str::slug($name))->exists()) {

            $max = static::withTrashed()->whereName($name)->latest('id')->skip(1)->value('slug');

            if (isset($max[-1]) && is_numeric($max[-1])) {

                return preg_replace_callback('/(\d+)$/', function ($mathces) {

                    return $mathces[1] + 1;
                }, $max);
            }
            return "{$slug}-2";
        }
        return $slug;
    }
}

Inspired by https://www.nicesnippets.com/blog/laravel-8-create-unique-slug-tutorial-example. I have a problem with soft deleted models and create unique slugs.
However, I hope it will can help somebody.