public async Task <bool> UpdateProductAsync(ProductForEditDto product)
{
var productFromRepo = await _context.Products
.SingleOrDefaultAsync(p => p.Id == product.Id);
if (productFromRepo == null)
{
return(false);
}
productFromRepo.Update(product);
return(true);
}
public async Task <IActionResult> Edit(int id, [FromForm] ProductForEditDto product)
{
if (product == null)
{
return(BadRequest());
}
if (ModelState.IsValid)
{
var user = await _userManager.GetUserAsync(HttpContext.User);
var productFromRepo = await _productRepository.GetProductForUserAsync(user.Id, product.Id);
if (productFromRepo == null)
{
//Either productId does not belong to user, or productId doesn't exist, or product has been deleted before the form was submitted
_flashMessage.Info($"Product no longer exists: {product.Id}");
ViewData["updatedVersion"] = null;
return(View());
}
var timeDifference = Math.Abs((productFromRepo.UpdatedAt - product.UpdatedAt).TotalMilliseconds);
if (timeDifference > Constants.ConcurrencyMilliseconds)
{
// Someone else has updated the product in the database
ViewData["updatedVersion"] = productFromRepo;
return(View());
}
try
{
await _productRepository.UpdateProductAsync(product);
await _productRepository.SaveChanges();
_flashMessage.Info($"Successfully updated product: {productFromRepo.ProductName}");
await _cachingProductStore.InvalidateCache(product.Id, user.Id);
return(RedirectToAction(nameof(Details), new { id = productFromRepo.Id }));
}
catch (DbUpdateException)
{
ModelState.AddModelError("", "Unable to save changes.");
}
}
return(View());
}
