sfp_api_laravel_serprati/app/Http/Requests/AppointmentRequest.php

<?php

namespace App\Http\Requests;

use App\Enums\AppointmentStatusEnum;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class AppointmentRequest extends FormRequest
{
    public function rules(): array
    {
        $partnerExists = Rule::exists('partner_agreements', 'id')->whereNull('deleted_at');
        $serviceExists = Rule::exists('partner_agreement_services', 'id')->whereNull('deleted_at');

        $rules = [
            'user_id'                      => 'sometimes|integer|exists:users,id',
            'partner_agreement_id'         => ['sometimes', 'integer', $partnerExists],
            'partner_agreement_service_id' => ['sometimes', 'integer', $serviceExists],
            'date'                         => 'sometimes|date',
            'time'                         => 'sometimes|date_format:H:i',
            'observations'                 => 'sometimes|nullable|string',
            'status'                       => ['sometimes', Rule::enum(AppointmentStatusEnum::class)],
        ];

        if ($this->isMethod('post')) {
            $rules['user_id']                      = 'required|integer|exists:users,id';
            $rules['partner_agreement_id']         = ['required', 'integer', $partnerExists];
            $rules['partner_agreement_service_id'] = ['required', 'integer', $serviceExists];
        }

        return $rules;
    }
}