public static IQueryable<Petshop.Data.Entities.Cart> ByQuantity(this IQueryable<Petshop.Data.Entities.Cart> queryable, System.Int32 quantity, params System.Int32[] additionalValues)
        {
            var quantityList = new List<System.Int32> { quantity };

            if (additionalValues != null)
                quantityList.AddRange(additionalValues);

            if (quantityList.Count == 1)
                return queryable.ByQuantity(quantityList[0]);

            return queryable.ByQuantity(quantityList);
        }
        public static IQueryable<PetShop.Core.Data.LineItem> ByQuantity(this IQueryable<PetShop.Core.Data.LineItem> queryable, int quantity, params int[] additionalValues)
        {
            var quantityList = new List<int> { quantity };

            if (additionalValues != null)
                quantityList.AddRange(additionalValues);

            if (quantityList.Count == 1)
                return queryable.ByQuantity(quantityList[0]);

            return queryable.ByQuantity(quantityList);
        }