Use a default laravel validation rule inside custom rule file

Question

I want to validate that my input is either UUID or "LAST_QUESTION". I created a custom validation rule LastOrUUID and I would like to use UUID validation rule inside of it. I could not find any way to do that, maybe you know what is the right way to implement this? My custom rule for context:

class LastOrUUID implements Rule
{
    /**
     * Determine if the validation rule passes.
     *
     * @param string $attribute
     * @param mixed $value
     * @return bool
     */
    public function passes($attribute, $value)
    {

        if ($value === 'LAST_QUESTION' /* || this is uuid */) {

            return true;

        }

        return false;

    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        // TODO - add translation
        return 'This should either be the last question or have a reference to next question!';
    }
}

I think do you mean inherit default validation in you custom class!!! — Nazari
– Nazari, Commented Jun 29, 2020 at 20:58
@Nazari yes, that would be ideal. But I am pretty happy with at least using Str::isUuid(), if it is used by Laravel and there is no better way. — Danielius
– Danielius, Commented Jun 30, 2020 at 17:08

Dan · Accepted Answer · 2020-06-29 16:58:38Z

3

If you just want to validate if the given value is an UUID you can either Laravel's native Str::isUuid method (which uses RegEx under the hood), the isValid method of Ramsey's UUID package or plain RegEx (according to this answer):

// Laravel native
use Illuminate\Support\Str;

return $value === 'LAST_QUESTION' || Str::isUuid($value);

// Ramsey's package
use Ramsey\Uuid\Uuid;

return $value === 'LAST_QUESTION' || Uuid::isValid($value);

// RegEx
return $value === 'LAST_QUESTION' || preg_match('/[a-f0-9]{8}\-[a-f0-9]{4}\-4[a-f0-9]{3}\-(8|9|a|b)[a-f0-9]{3‌}\-[a-f0-9]{12}/', $value);

edited Jun 29, 2020 at 16:58

answered Jun 29, 2020 at 16:47

Dan

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3 Comments

Danielius Over a year ago

Yes, I know, thanks for your answer! But my thinking is - if there is a laravel rule, it must have been implemented somehow and should be reusable, no? It would be a good practice to use same UUID validation implementation everywhere where I validate UUID, am I wrong?

Dan Over a year ago

Good thinking! There is indeed a UUID validation rule available. It uses Str::isUuid internally which again is based on a RegEx. I'll add that to my post, because I didn't know that Laravel offers this method.

Danielius Over a year ago

Thanks! I like this solution more. Very helpful.

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