public IHttpActionResult Get(int id)
        {
            var item = this.Data.Homeworks.GetById(id);

            if (item != null)
            {
                var result = new HomeworkModel()
                {
                    FileUrl = item.FileUrl,
                    TimeSent = item.TimeSent,
                    StudentId = item.StudentId,
                    CourseId = item.CourseId
                };

                return this.Ok(result);
            }

            return this.NotFound();
        }
        public IHttpActionResult Post(HomeworkModel model)
        {
            if (!this.ModelState.IsValid)
            {
                return this.BadRequest("Incorrect data");
            }

            // Just adding first student and course 
            var item = new Homework()
            {
                FileUrl = model.FileUrl,
                TimeSent = DateTime.Now,
                StudentId = this.Data.Students.All().First().Id,
                CourseId = this.Data.Courses.All().First().Id
            };

            this.Data.Homeworks.Add(item);
            this.Data.SaveChanges();

            return this.Ok("Record added");
        }