public async Task <IEnumerable <Product> > SortAsync(IEnumerable <Product> products, SortDirection sortDirection)
{
//1. Retrieve shopper's histories
var shopperHistories = await _shoppingRepository.GetShopperHistoriesAsync();
//2. Sort products by weightage
return((from p in products
let weightage = CalculateProductWeightage(p, shopperHistories)
orderby weightage descending
select p).ToList());
}
