investbrain/app/Http/Requests/FormRequest.php

<?php

declare(strict_types=1);

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest as BaseFormRequest;

class FormRequest extends BaseFormRequest
{
    public function requestOrModelValue($key, $model): mixed
    {
        return $this->request->get($key) ?? $this->{$model}?->{$key};
    }
}