YII十日通之第一日如何声明与捕获异常

           assert('is_string($languageCode) && !empty($languageCode)');
            assert('$sourceModel instanceof MessageSource');
            assert('is_string($translation) && !empty($translation)');
            $model = new MessageTranslation();
            $model->language      = $languageCode;
            $model->messagesource = $sourceModel;
            $model->translation   = $translation;
            if (!$model->save())
            {
                throw new FailedToSaveModelException();
            }