Hi! I have a simple object hierarchy :) :

[HierarchyRoot]
    public abstract class AbstractObject : Entity
    {
        [Field, Key]
        public Guid Id { get; private set; }
        ...
    }

    public abstract class BlogPost : AbstractObject 
    {
        [Field]
        public BlogCategory Category { get; set; }
        ...
    }

    public sealed class Article : BlogPost
    {
    }

I want to receive list of Categories:

Query<Article>.All.Select(p => p.Category)

I receive enumeration of NULLs. Then I make a trick and all becomes fine:

Query<Article>.All.Where(p => p.Category == p.Category).Select(p => p.Category)

It is not a problem, but an annoyance.

This thread was imported from our support forum. The original discussion may contain more detailed answer. Original topic by buck.