Fills the slug column automatically for the models using this trait.

Sluggable.php

<?php

namespace App\Traits;

trait Sluggable
{
    /**
     * Boots the sluggable trait.
     */
    public static function bootSluggable()
    {
        static::saving(function ($model) {
            if (! $model->exists) {
                $model->slug = str_slug($model->{$model->getSluggableSource()});
            }
        });
    }

    /**
     * @return string
     */
    protected function getSluggableSource()
    {
        if (property_exists($this, "sluggableSource")) {
            return $this->{"sluggableSource"};
        }
        
        return "name";
    }
}