/**
  * Creates a new Announcement model.
  * If creation is successful, the browser will be redirected to the 'view' page.
  * @return mixed
  */
 public function actionCreate()
 {
     $model = new Announcement();
     if ($model->load(Yii::$app->request->post())) {
         $model->setAttributes(array('user_fk' => Yii::$app->user->identity->user_id));
     }
     if ($model->save()) {
         return $this->redirect(['view', 'id' => $model->announcement_id]);
     } else {
         return $this->render('create', ['model' => $model]);
     }
 }