Append a slug number if aleardy exists on db

Post.php

public function setTitleAttribute($value)
{
    $slug = \Str::slug($value);
    $count = static::whereRaw("slug RLIKE '^{$slug}(-[0-9]+)?$'")->count();

    $this->attributes['title'] = $value;
    $this->attributes['slug'] = $count ? "{$slug}-{$count}" : $slug;
}