public async Task <IActionResult> Index(string buyerKey)
{
var spec = string.IsNullOrEmpty(buyerKey)
? BaseSpecification <Order> .Create(i => true)
: BaseSpecification <Order> .Create(i => i.BuyerId.Contains(buyerKey));
spec.AddInclude("OrderItems($select=UnitPrice,Units)");
var orders = await orderRepository.ListAsync(spec);
ViewBag.buyerKey = buyerKey;
return(View(orders.OrderByDescending(i => i.OrderDate)));
}
