public ActionResult Create(Consumption consumption)
        {
            if (ModelState.IsValid)
            {
                db.Consumptions.Add(consumption);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.CowId = new SelectList(db.Cows, "Id", "Name", consumption.CowId);
            return View(consumption);
        }
        public ActionResult Create(Consumption consumption)
        {
            if (ModelState.IsValidField("Date") && DateTime.Now < consumption.Date)
                ModelState.AddModelError("Date", "Input a current or past date");
            if (ModelState.IsValid)
            {
                db.Consumptions.Add(consumption);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.CowId = new SelectList(db.Cows, "Id", "Name", consumption.CowId);
            return View(consumption);
        }
 public ActionResult Edit(Consumption consumption)
 {
     if (ModelState.IsValid)
     {
         db.Entry(consumption).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.CowId = new SelectList(db.Cows, "Id", "Name", consumption.CowId);
     return View(consumption);
 }