public IActionResult Edit(int id)
        {
            var supplierExists = suppliers.Exists(id);

            if (!supplierExists)
            {
                return(RedirectToAction(nameof(Local)));
            }

            SupplierEditModel supplier = this.suppliers.ById(id);

            return(View(new SupplierFormModel
            {
                Name = supplier.Name,
                IsImporter = supplier.IsImporter
            }));
        }