public ActionResult Index(CreateGroupViewModel model)
        {
            var chosenPlace = this.Db.PlaceRepository.All().FirstOrDefault(x => x.Name == model.PlacePlaceholder);
            var userId = User.Identity.GetUserId();
            var user = this.Db.UsersRepository.All().FirstOrDefault(x => x.Id == userId);

            var newGroup = new HungryGroup
            {
                Creator = user,
                Place = chosenPlace,
                StartingTime = model.StartingTime,
                EatTime = chosenPlace.EatTime
            };

            this.Db.HungryGroupRepository.Add(newGroup);
            this.Db.SaveChanges();

            return View();
        }
 public ActionResult CreateGroup(CreateGroupViewModel model)
 {
     if (!ModelState.IsValid)
     {
         return PartialView("_CreateGroupForm", model);
     }
     return View();
 }