sfp_api_laravel_ginastica_cerebro/app/Http/Requests/UnitHistoryRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class UnitHistoryRequest extends FormRequest
{
    public function rules(): array
    {
        $isUpdate = $this->isMethod('PUT') || $this->isMethod('PATCH');

        return [
            'unit_id'               => ($isUpdate ? 'sometimes|' : 'required|') . 'integer|exists:units,id',
            'title'                 => 'required|string|max:255',
            'content'               => 'nullable|string',
            'visible_to_franchisee' => 'boolean',
        ];
    }
}