Nhibernate not tracking changes

Question

I'm using nhibernate and it appears that changes to my new object are not persisted. After creating and saving an object I then modify it and commit the transaction. However none of the modifications are saved. The strange thing is this code was working previously and I have no idea what could cause this. Nothing was changed that's obviously related..

As an attempted work around I saved the object later in the procedure after all the changes where made however I was greeted with an Assertion Failure collection [] was not processed by flush.

Any ideas?

Answer 1

I have no idea what happened but the issue has been resolved, as far as I can tell the initial result shouldn't have happened. However the assertion failure was a very real problem, I was loading a user in the pre insert event listener for auditing reasons and users contain collections which were obviously not processed.

Answer 2

I've found that using the Interceptor instead of the supposedly newer Event Listeners provides the correct functionality.

/// <summary> Updates auditable objects </summary>
public class AuditEventListener : EmptyInterceptor, IPreInsertEventListener, IPreUpdateEventListener
{
    private ISecurityManager securityManager;

    public override bool OnFlushDirty( object entity, object id, object[] currentState, object[] previousState, string[] propertyNames, NHibernate.Type.IType[] types )
    {
        var auditable = entity as IAuditable;
        if (auditable != null) {

            Set( x => auditable.Modifier, propertyNames, auditable, currentState, SecurityManager.Identity );
            //Set( x => auditable.DateModified, args.Persister, auditable, args.State, TwentyClock.Now );

            return true;
        }
        return false;
    }

    public bool OnPreInsert( PreInsertEvent args )
    {
        var auditable = args.Entity as IAuditable;
        if (auditable != null) {

            Set( x => auditable.Creator, args.Persister.PropertyNames, auditable, args.State, SecurityManager.Identity );
            Set( x => auditable.DateAdded, args.Persister.PropertyNames, auditable, args.State, TwentyClock.Now );
        }
        return false;
    }
// Hidden methods etc..
}