education-project/app/Http/Requests/SchoolClassRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class SchoolClassRequest extends ApiFormRequest
{
    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'number' => 'required|integer|between:1,11',
            'letter' => 'required|max:1',
            'count_students' => 'required|integer',
            'profile' => 'required',
        ];
    }
}