public ActionResult Create(Fixture fixture, Guid GroupId, Guid HomeTeamId, Guid AwayTeamId)
        {
            if (ModelState.IsValid)
            {
                var group = db.Groups.Find(GroupId);
                var homeTeam = db.Teams.Find(HomeTeamId);
                var awayTeam = db.Teams.Find(AwayTeamId);

                fixture.Id = Guid.NewGuid();
                fixture.Away = awayTeam;
                fixture.Home = homeTeam;
                fixture.Group = group;

                db.Fixtures.Add(fixture);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(fixture);
        }
 public ActionResult Edit(Fixture fixture)
 {
     if (ModelState.IsValid)
     {
         db.Entry(fixture).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(fixture);
 }