public IList <ShoppingListDto> GetListsByUserId(int userId)
        {
            var linkedUserLists = _listRepository.GetLinkByUserId(userId);
            List <ShoppingListDto> listOfLists = new List <ShoppingListDto>();

            foreach (LinkUserToList link in linkedUserLists)
            {
                var list = Get(link.ShoppingListId, userId);
                listOfLists.Add(list);
            }

            return(listOfLists);
        }