ldc-legaulois/app/Http/Requests/SurveyAnswersRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Support\Facades\Auth;

class SurveyAnswersRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        // handle radio case
        if (is_string($this->answers)) {
            $this->merge(['answers' => [$this->answers]]);
        }
        return Auth::guard('customer')->check();
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'answers' => 'required|array',
            'answers.*' => 'exists:surveys_answers,id',
        ];
    }
}