sfp_api_laravel_ginastica_cerebro/app/Http/Requests/ClassRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class ClassRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

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

        return [
            'title'                 => "{$required}|string|max:255",
            'class_package_unit_id' => [
                $required,
                'integer',
                Rule::exists('class_package_units', 'id')
                    ->where('unit_id', $this->input('active_unit_id')),
            ],
            'instructor'            => 'nullable|string|max:255',
            'room'                  => 'nullable|string|max:255',
            'date_time_start'       => "{$required}|date",
            'date_time_end'         => "{$required}|date|after:date_time_start",
            'status'                => 'sometimes|string|max:50',
        ];
    }

    /**
    * Add custom messages when needed
    * public function messages(): array
    * {
    *   return [
    *        'field.required' => __('message.algo'),
    *    ];
    * }
    */
}