Using ConditionalRules in NestedRules throws an exception.

[Lelectrolux]

Laravel Version

v10.10.0

PHP Version

8.1.5

Database Driver & Version

No response

Description

When using Rule::when(...) inside a Rule::forEach(...) callback, an Object of class Illuminate\Validation\ConditionalRules could not be converted to string exception is thrown.

I suspect Illuminate\ValidationValidationRuleParser::prepareRule(...) does not deal with ConditionalRule.
I suspect it was an oversight of #40498.

If this is expected behavior, a mention in the docs might be warranted.

If I didn't understand something, please educate me.

I might try to make a failing test PR tomorrow, but I'm probably out of my depth to fix the actual bug itself.

Cheers, and thanks for the hard work.

Steps To Reproduce

Here is a minimum reproduction code in routes/web.php.

use Illuminate\Support\Facades\Route;
use Illuminate\Support\Facades\Validator;
use \Illuminate\Validation\Rule;

Route::get('/bug', function () {
    Validator::make(
        [
            'foo' => [
                [
                    'bar' => true
                ],
                [
                    'bar' => false
                ]
            ]
        ],
        [
            'foo.*' => Rule::forEach(fn(mixed $value, string $attribute) => [
                'bar' => Rule::when(true, ['accepted'], ['declined'])
            ])
        ]
    );
});

[Lelectrolux]

That was quick, thanks @cosmastech & team ❤️

Just have to wait for realease day now 👍🏼