view: function(req,res) {
    var lessonId = sanitizer.escape(req.param("id"));

    async.parallel(
        {
            // Fetch lesson data
            lesson: function(callback) {
                DataService.getLesson(lessonId, callback);
            },

            // Fetch courses data
            courses: function(callback) {
                DataService.getCourses({lesson: lessonId}, callback);
            },

            // Fetch exercises data
            exercises: function(callback) {
                DataService.getExercises({lesson: lessonId}, callback);
            },

            // Fetch corrected data
            corrected: function(callback) {
                DataService.getCorrected({lesson: lessonId}, callback);
            }
        },

        /**
         * Callback that is called after all parallel jobs are done or some error has occurred
         * within processing those.
         *
         * @param   {null|string}   error   Possible error
         * @param   {{
         *              lesson: {id: "", ...},
         *              courses: {id: "", ...}[],
         *              exercises: {id: "", ...}[],
         *              corrected: {id: "", ...}[],
         *          }}              data
         */
            function(error, data) {
            if (error) {
                console.log(error);
                sails.log.error(error);

                // An error occurred
            } else {
                data.layout = '';

                res.view(data);
            }
        }
    );
}