Loading navigation properties in NHibernate 3.2 - nhibernate

Question

I have these entities:
public class Post {
public virtual int Id { get; set; }
public virtual ICollection<Tag> Tags { get; set; }
public virtual ICollection<Comment> Comments { get; set; }
}
public class Tag {
public virtual int Id { get; set; }
public virtual ICollection<Post> Posts { get; set; }
}
public class Comment {
public virtual int Id { get; set; }
public virtual Post Post { get; set; }
}
I want to load a Post by it's related Tags and related Comments's count by LINQ. I use this:
var posts = session
.Query<Post>()
.OrderBy(t => t.Id)
.Select(t => new {
Post = t,
CommentsCount = t.Comments.Count(),
Tags = t.Tags
}).ToList();
Do you think it is enough? or do you have any suggestion that may be better than my code? thanks.

Answer 1

This highly depends on your mapping and what you want to do with the fetched result. Imho eager loading Tags would speed up performance (Select N+1) if you want to access the tags list (assuming that the tags are mapped as lazy).
var posts = session
.Query<Post>()
.Fetch(t => t.Tags)
.OrderBy(t => t.Id)
.Select(t => new {
Post = t,
CommentsCount = t.Comments.Count(),
Tags = t.Tags
}).ToList();
http://ayende.com/blog/1328/combating-the-select-n-1-problem-in-nhibernate