app.get('/api/survey/:surveyId/description', function(req, res) {
        models.Survey.scope('includeAuthor').findByPk(Utils.decryptSurveyId(req.params.surveyId)).then(function(survey) {
            if (survey === null) {
                return res.status(404).json({ error_code: 'invalid_resource', error: 'requested survey doesn\'t exist.' });
            }