---
title: "Validation — Options for Laravel | Roundly"
description: "Return Laravel validation rules from rules() and every write is validated before it’s cast or stored."
url: https://roundly-consulting.com/open-source/docs/options-for-laravel/validation
language: en
---

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[Options for Laravel](https://roundly-consulting.com/open-source/docs/options-for-laravel.md)

# Validation

Return Laravel validation rules from rules() to validate on write. The default is an empty array, so nothing is validated until you opt in:

```php
use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
use RoundlyConsulting\Options\BaseOption;

final class SeatLimitOption extends BaseOption
{
    public function key(): string
    {
        return 'seat-limit';
    }

    public function default(): mixed
    {
        return 5;
    }

    public function castAs(): string|CastsAttributes
    {
        return 'integer';
    }

    public function rules(): array|string
    {
        return ['required', 'integer', 'min:1', 'max:100'];
    }
}
```

Rules are applied to a field named value, before the cast and before anything is stored. Invalid values throw Illuminate\\Validation\\ValidationException — Laravel’s own exception, not an OptionException, so a controller turns it into the usual 422 or redirect with errors:

```php
use Illuminate\Validation\ValidationException;

try {
    Options::set(SeatLimitOption::class, 250, $team);
} catch (ValidationException $e) {
    $e->errors(); // ['value' => ['…']] — rules are applied to a field named "value"
}
```

## Where it applies

- Every write that goes through set(): the facade, the fluent API, helpers, HasOptions, setMany(), remember() when it stores, group set() and options:set.
- setMany() and group set() validate the whole batch before the first write — one invalid value means nothing is stored.
- Rules may be an array or a pipe-delimited string such as 'integer|min:0'.
- Laravel skips non-implicit rules such as in: for a blank string, so \['in:light,dark'\] alone lets '' through. Add required — or nullable, if blank is meant to be allowed.
- Imports write raw rows and don’t run rules(). Options::fake() validates like the real manager — an invalid write throws and isn’t recorded.

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