sfp_api_laravel_ginastica_cerebro/app/Http/Requests/GroupRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class GroupRequest extends FormRequest
{
    public function rules(): array
    {
        $isCreate = $this->isMethod('POST') && !$this->route('id');

        return [
            'name'      => ($isCreate ? 'required' : 'sometimes|required') . '|string|max:255',
            'status'    => 'sometimes|in:ACTIVE,INACTIVE',
            'unit_ids'  => 'sometimes|nullable|array',
            'unit_ids.*' => 'integer|exists:units,id',
        ];
    }
}