Spatie\Sluggable\HasSlug::generateNonUniqueSlug PHP Метод

    protected function generateNonUniqueSlug() : string
    {
        if ($this->hasCustomSlugBeenUsed()) {
            $slugField = $this->slugOptions->slugField;
            return $this->{$slugField};
        }
        return str_slug($this->getSlugSourceString());
    }