public async Task <IEnumerable <TopProductDto> > GetTopSoldProductsFromOrders(IEnumerable <Order> orders,
int count = 5)
{
var query = new GetTopSoldProductsFromOrdersQuery(orders, count);
return(await _mediator.Send(query));
}
public async Task QueryHandler_ReturnsDescendingOrderedTopProductsSold(
GetTopSoldProductsFromOrdersQuery query,
IEnumerable <TopProductDto> expectedProducts)
{
var queryHandler = new GetTopSoldProductsHandler(_repositoryMock.Object);
var result = await queryHandler.Handle(query, new CancellationToken());
result.Should().BeEquivalentTo(expectedProducts, options => options.WithStrictOrdering());
}
public async Task <IEnumerable <TopProductDto> > Handle(GetTopSoldProductsFromOrdersQuery request,
CancellationToken cancellationToken)
{
var productIds = request.Orders.SelectMany(o => o.Lines)
.Select(l => l.MerchantProductNo)
.Distinct();
var products = await _repository.Products.GetProductsByMerchantNo(productIds);
var quantityAggregate = request.Orders.SelectMany(o => o.Lines)
.Aggregate(new Dictionary <string, int>(), AggregateQuantityByProduct)
.ToArray();
var result = products.Join(quantityAggregate,
product => product.MerchantProductNo,
qa => qa.Key,
(product, qa) => new TopProductDto(product, qa.Value))
.OrderByDescending(p => p.TotalSold)
.ThenByDescending(p => p.Name)
.Take(request.Count);
return(result);
}
