How to search in a child collection

[cederron]

I have following entities:

public class Product {
   public string Name { get; set }
}

public class Order {
   public List<Product> Products { get; set; }
}

I want to use a keyword to search for Orders where a Product name contains such keyword.
I tried using search endpoint from client, sending:

{ "advancedSearch": { "fields": ["Products.Name"], "keyword": "shoe" } }

That obviously does not work because Products is a list and Products.Name is undefined.

Also tried to write an specification using:

Query.Where(order => order.Products.Any( prod => prod.Name.Contains(request.Keyword)), request.Keyword != null);

But that doesn't work for some reason I don't know.

Any help with this please?
Thanks.