guild/frontend/modules/api/controllers/AnswerController.php

<?php

namespace frontend\modules\api\controllers;

use common\models\Answer;
use Yii;
use yii\filters\auth\HttpBearerAuth;
use yii\web\NotFoundHttpException;
use yii\rest\Controller;

class AnswerController extends Controller
{
    public function behaviors(): array
    {
        $behaviors = parent::behaviors();

        $behaviors['authenticator']['authMethods'] = [
            HttpBearerAuth::className(),
        ];

        return $behaviors;
    }

    public function verbs(): array
    {
        return [
            'get-answers' => ['get'],
        ];
    }

    /**
     * @throws NotFoundHttpException
     */
    public function actionGetAnswers(): array
    {
        $question_id = Yii::$app->request->get('question_id');
        if(empty($question_id) or !is_numeric($question_id))
        {
            throw new NotFoundHttpException('Incorrect question ID');
        }

        $answers = Answer::activeAnswers($question_id);
        if(empty($answers)) {
            throw new NotFoundHttpException('Answers not found or question inactive');
        }

        array_walk( $answers, function(&$arr){
            unset(
                $arr['created_at'],
                $arr['updated_at'],
                $arr['answer_flag'],
                $arr['status']
            );
        });

        return  $answers;
    }
}