在nhibernate查询中的子查询中过滤

Question

I have two tables in one-to-many relation:

product  -> orders

In the Products table (parent) I have the maximum number of products that I can sell, and in the child table (orders) I have the number of products sold for each row. I need to make a list of products that I have available in stock, filtered by

 orders.count() <= product.NumberOfProductsInStock

How can I accomplish this with a query in nhibernate?

Answer 1

You could do:

CurrentSession.Linq<Product>()
    .Where(p => p.NumberOfProductsInStock > 0 && (p.Orders.Count() == 0 || p.Orders.Count() <= p.NumberOfProductsInStock))
    .ToList();