public function actionJoinToClub()
{
$request = Yii::$app->request;
$clubId = $request->post('clubId');
if (Club::isGuest($clubId, Yii::$app->user->getId()) && !Club::isPotentialMembers($clubId, Yii::$app->user->getId())) {
$status = Club::joinToClub($clubId, Yii::$app->user->getId());
echo json_encode(['status' => $status]);
return;
}
echo json_encode(['error' => 'error']);
}