public function actionReleaseActivity()
{
$request = yii::$app->request;
$session = yii::$app->session;
$user = $session['user'];
$activity = new Activity();
$activity['id'] = Activity::getNewActivityId();
$activity['startdate'] = $request->post('startdate');
$activity['finishdate'] = $request->post('finishdate');
$activity['peoplenum'] = intval($request->post('peoplenum'));
$activity['beginerId'] = $user['id'];
$activity->save();
return $this->render("oneActivity", ['activity' => $activity, 'attendUsers' => array()]);
}