sfp_api_laravel_ginastica_cerebro/app/Http/Requests/ClassPackageRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class ClassPackageRequest extends FormRequest
{
    public function rules(): array
    {
        $required = $this->isMethod('POST') ? 'required' : 'sometimes';

        return [
            'name'                    => "$required|string|max:255",
            'quantity_classes'        => "$required|integer|min:1",
            'contract_value'          => "$required|numeric|min:0",
            'contract_register_value' => "$required|numeric|min:0",
            'contrat_discount_value'  => 'nullable|numeric|min:0',

            'materials'                => 'nullable|array',
            'materials.*.product_id'   => 'required_with:materials|integer|exists:products,id',
            'materials.*.quantity'     => 'required_with:materials|integer|min:1',
            'materials.*.price'        => 'required_with:materials|numeric|min:0',
        ];
    }
}