public ActionResult Edit(WeightCheckIn weightCheckIn)
        {
            db.Entry(weightCheckIn).State = System.Data.EntityState.Modified;
            db.SaveChanges();

            return RedirectToAction("WeightCheckIns");
        }
        public ActionResult CheckIn(CheckIn CheckIn)
        {
            var user = db.Users.Where(e => e.UserName == HttpContext.User.Identity.Name).FirstOrDefault();

            var weightCheckIn = new WeightCheckIn()
            {
                UserId = user.Id,
                CheckInDate = CheckIn.CheckInDate,
                Weight = CheckIn.Weight
            };

            db.Entry(weightCheckIn).State = System.Data.EntityState.Added;
            db.SaveChanges();

            return RedirectToAction("WeightCheckIns");
        }