public Result AddToFavorites(string userId, string productId)
{
var cart = _confirmUserCartExistedDomainService.GetUserCart(userId);
if (cart.IsEmpty())
{
return(Result.Fail("当前购物车中并没有商品"));
}
var cartItem = cart.GetCartItem(productId);
if (cartItem == null)
{
return(Result.Fail("该购物项已不存在"));
}
var favorites = DomainRegistry.FavoritesRepository().GetByUserId(userId) ?? new Favorites(userId, null);
favorites.AddFavoritesItem(cartItem);
DomainRegistry.FavoritesRepository().Save(favorites);
return(Result.Success());
}