// GET: Student
        public string GetEvents(string jsonString)
        {
            var Id     = JsonConvert.DeserializeObject <ID>(jsonString);
            var person = db.GetPerson(Id.Id);

            if (person.Status == "Nauczyciel")
            {
                IEnumerable <EventViewModel> events = db.GetEventsForTeaher(person).Select(p =>
                                                                                           new EventViewModel()
                {
                    Category    = p.Category,
                    Description = p.Description,
                    Title       = p.Title,
                    Data        = p.Data,
                    EndDate     = p.EndData
                });
                return(JsonConvert.SerializeObject(events));
            }
            else if (person.Status == "Uczeń")
            {
                IEnumerable <EventViewModel> events = db.GetEventsForStudent(person).Select(p =>
                                                                                            new EventViewModel()
                {
                    Category    = p.Category,
                    Description = p.Description,
                    Title       = p.Title,
                    Data        = p.Data,
                    EndDate     = p.EndData
                });
                return(JsonConvert.SerializeObject(events));
            }

            return("");
        }