public function save()
 {
     if (!$this->validate()) {
         return false;
     }
     $this->title = ucfirst($this->title);
     $user_interest = new UsersInterests();
     $user_interest->user_id = Yii::$app->user->id;
     if (!($interest = Interests::findOne([Interests::FIELD_TITLE => $this->title]))) {
         $interest = new Interests();
         $interest->title = $this->title;
         $interest->save();
     }
     $user_interest->interest_id = $interest->interest_id;
     $user_interest->save();
     return true;
 }