public ActionResult Create(Recipe recipe, int[] groups)
        {
            try
            {
                User currentUser = _recipeContext.Users.Single(u => u.Id.ToUpper() == User.Identity.Name.ToUpper());
                recipe.User = currentUser;
                recipe.PostedOn = DateTime.Now;
                IQueryable<Group> selectedGroups = _recipeContext.Groups.Where(g => groups.Contains(g.Id));
                foreach (Group selectedGroup in selectedGroups)
                {
                    recipe.Groups.Add(selectedGroup);
                }
                currentUser.Recipes.Add(recipe);
                _recipeContext.SaveChanges();

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
        public ActionResult Edit(Recipe recipe, int[] groups)
        {
            Recipe originalRecipe = _recipeContext.Recipes.Single(r => r.Id == recipe.Id);
            originalRecipe.Name = recipe.Name;
            originalRecipe.Description = recipe.Description;
            originalRecipe.Ingredients = recipe.Ingredients;
            originalRecipe.Directions = recipe.Directions;

            if (groups == null)
            {
                originalRecipe.Groups.Clear();
            }
            else
            {
                foreach (Group groupToRemove in originalRecipe.Groups.Where(g => !groups.Contains(g.Id)).ToArray())
                {
                    originalRecipe.Groups.Remove(groupToRemove);
                }
            }

            if (groups != null)
            {
                foreach (int groupIdToAdd in groups.Where(groupId => !originalRecipe.Groups.Any(g => g.Id == groupId)))
                {
                    originalRecipe.Groups.Add(_recipeContext.Groups.Single(g => g.Id == groupIdToAdd));
                }
            }

            _recipeContext.SaveChanges();

            return RedirectToAction("Index");
        }