Question

What would cause a change to not generate an update statement for an existing entity? I have a command that updates a status enum on an entity. It changes it from Active to Deleted. I use the same command (generically) to update the status bit on other entities without a problem. I can update a single string on the entity in question without changing anything else and the update processes fine. I can observe all this going down in NHProf…

I guess my questions then are:

• What would cause NHibernate to not update an entity when an enum value (and nothing else … or other things to?) is/are changed?
• What is the best way to track down issues like these?

Thanks for your help!

A clue. The property on the base type is:

public virtual EntityStatus Status { get; protected set; }

If I make the setter public and assign to it directly, NHibernate picks it up just fine. When it’s protected, I call a method on the entity and update the Status there. Does that provide any clues?

Answer 1

So, this was a fun one and a total pain in the ass to track down. It turns out that using Lazy loading inside of an Any mapping somehow screws the ol’ pooch somewhere. So calling a virtual method to update a protected property does not work when I do this:

Any(o => o.Thing, typeof(Guid), m =>
                        {
                            m.IdType<Guid>();
                            m.MetaType<string>();
                            m.MetaValue("Squirmy", typeof(SquirmyThing));
                            m.MetaValue("Odoriferous", typeof(OdoriferousThing));
                            m.Columns(id => id.Name("ThingId"), cr => cr.Name("ThingType"));
                            m.Lazy(true);
                            m.Cascade(Cascade.Persist);
                        });

But it DOES work when I do this:

Any(o => o.Thing, typeof(Guid), m =>
                        {
                            m.IdType<Guid>();
                            m.MetaType<string>();
                            m.MetaValue("Squirmy", typeof(SquirmyThing));
                            m.MetaValue("Odoriferous", typeof(OdoriferousThing));
                            m.Columns(id => id.Name("ThingId"), cr => cr.Name("ThingType"));
                            m.Lazy(false);
                            m.Cascade(Cascade.Persist);
                        });

Anyway, I really hope this helps someone else crazy enough to use an Any mapping.