public async Task <IActionResult> Update(BasketDetailsViewModel bvm)
{
if (!ModelState.IsValid)
{
return(RedirectToAction("Index", "Shop"));
}
foreach ((long itemId, int quantity) in bvm.Quantities)
{
BasketItem item = await _productDbContext.BasketItems.FindAsync(itemId);
if (item is null)
{
continue;
}
// If the new quantity is greater than 0, then update; otherwise, delete
if (quantity > 0)
{
item.Quantity = quantity;
_productDbContext.BasketItems.Update(item);
}
else
{
_productDbContext.Remove(item);
}
}
await _productDbContext.SaveChangesAsync();
return(RedirectToLocal(bvm.ReturnUrl));
}
public async Task <IViewComponentResult> InvokeAsync(
bool quantityInputs = true, bool checkoutButton = true)
{
// Always create a view model to avoid the view component view trying
// to take the current action's model (possible MVC bug?)
BasketDetailsViewModel bvm = new BasketDetailsViewModel()
{
QuantityInputs = quantityInputs,
CheckoutButton = checkoutButton,
};
long?currentBasketId =
(await _userManager.GetUserAsync(HttpContext.User))?.CurrentBasketId;
// If the user is logged in and has a basket, fill in the view model;
// otherwise, the default values will suffice
if (currentBasketId.HasValue)
{
// Retrieve all of the items in the current basket, making sure
// to include the Product navigational property
bvm.Items = await _productDbContext.Baskets.Where(b => b.Id == currentBasketId)
.Include(b => b.Items)
.SelectMany(b => b.Items)
.Include(bi => bi.Product)
.ToListAsync();
if (bvm.QuantityInputs)
{
bvm.Quantities = new Dictionary <long, int>();
foreach (BasketItem item in bvm.Items)
{
bvm.Quantities[item.Id] = item.Quantity;
}
}
// Find the total quantity in the basket by summing each line item's quantity
bvm.TotalQuantity = bvm.Items.Select(bi => bi.Quantity)
.Sum();
// Find the grand total price in the basket by summing the products of each
// line item's quantity by its product's price. The Product navigational
// property was already included in the Items LINQ expression seen above.
bvm.TotalPrice = bvm.Items.Select(bi => bi.Quantity * bi.Product.Price)
.Sum();
}
return(View(bvm));
}
