public static string GetUsersWithProducts(ProductShopContext context)
        {
            var users = new
            {
                usersCount = context.Users.Count(x => x.ProductsSold.Any(y => y.Buyer != null)),
                users = context.Users
                .Where(x=>x.ProductsSold.Any(y=>y.Buyer != null))
                .OrderByDescending(u => u.ProductsSold.Count(ps => ps.Buyer != null))
                .Select(y => new
                {
                    firstName = y.FirstName,
                    lastName = y.LastName,
                    age = y.Age,
                    soldProducts = new
                    {
                        count = y.ProductsSold.Count(b => b.Buyer != null),
                        products = y.ProductsSold
                        .Where(b => b.Buyer != null).Select(s => new
                        {
                            name = s.Name,
                            price = s.Price
                        }).ToArray()
                    }
                }).ToArray()
            };


            var result = JsonConvert.SerializeObject(users, new JsonSerializerSettings()
            {
                Formatting = Formatting.Indented,
                NullValueHandling = NullValueHandling.Ignore
            });

            return result;
        }