/** 
  * Registers a user
  * @param $data
  * @return Bool
  */
 private function registerUser($data)
 {
     $userModel = new User();
     $userModel->scenario = 'registration';
     $profileModel = $userModel->profile;
     $profileModel->scenario = 'registration';
     // User: Set values
     $userModel->username = $data['username'];
     $userModel->email = $data['email'];
     $userModel->group_id = $data['group_id'];
     $userModel->status = User::STATUS_ENABLED;
     // Profile: Set values
     $profileModel->firstname = $data['firstname'];
     $profileModel->lastname = $data['lastname'];
     // Password: Set values
     $userPasswordModel = new Password();
     $userPasswordModel->setPassword($data['password']);
     if ($userModel->save()) {
         // Save user profile
         $profileModel->user_id = $userModel->id;
         $profileModel->save();
         // Save user password
         $userPasswordModel->user_id = $userModel->id;
         $userPasswordModel->save();
         // Join space / create then join space
         foreach ($data['space_names'] as $key => $space_name) {
             // Find space by name attribute
             $space = Space::findOne(['name' => $space_name]);
             // Create the space if not found
             if ($space == null) {
                 $space = new Space();
                 $space->name = $space_name;
                 $space->save();
             }
             // Add member into space
             $space->addMember($userModel->id);
         }
         return true;
     } else {
         Yii::$app->session->setFlash('error', Html::errorSummary($userModel));
         return false;
     }
 }