public Shop AddMenu(Menu menu, string shopId) { var shop = dac.GetShop(x => x._id == shopId); var shopmenu = shop.Menus.ToList(); menu._id = Guid.NewGuid().ToString(); menu.CreateDate = DateTime.UtcNow; shopmenu.Add(menu); shop.Menus = shopmenu; dac.UpdateShop(shop); return(shop); }