title: Knowing child collections count without loading them in NHIbernate
body: <p>I'm using NHibernate with FluentNH. I've a simple class called PostCategory and it contains a collection of Posts. The PostCategory class contains a property called TotalActivePosts. When I load all the PostCategories I want the no. of active posts for each category to be populated in this property. How I can do that? Any help is greatly appreciated.</p>
  
  <p>Vijaya Anand</p>