public List <ProductGetModel> GetAllByCategoryId(int categoryId, User currentUser)
        {
            var existingCategory = this.categoryService.GetById(categoryId, currentUser);

            if (existingCategory == null)
            {
                return(null);
            }

            return(context.Products
                   .Where(p => p.CategoryId == categoryId)
                   .Select(p => ProductGetModel.DtoFromModel(p)).ToList());
        }
        public IActionResult GetProduct(int id)
        {
            var cat = _dataService.GetProduct(id);

            if (cat == null)
            {
                return(NotFound());
            }
            var _out = new ProductGetModel {
                Name = cat.Name, CategoryName = cat.Category.Name
            };

            return(Ok(_out));
        }