Retrieve a unique slug with your Laravel model.

laravel-model-unique-slug.php

/**
 * Find a unique slug.
 *
 * @see https://github.com/cocur/slugify
 * @param $text
 *
 * @return string
 */
public static function getUniqueSlug($text)
{
    $slug = substr(Slugify::slugify($text), 0, 255);
    $unique = boolval(static::where('slug', '=', $slug)->count());
    $counter = 1;
    while (! $unique) {
        $postfix = "-{$counter}";
        $slug = $counter == 1
            ? substr($slug, 0, 255-strlen($postfix)).$postfix
            : substr($slug, 0, strlen($slug) - strlen("-".((string) ($counter-1))));
        $unique = boolval(static::where('slug', '=', $slug)->count());
        $counter++;
    }
    return $slug;
}