If I understand your question, you want to know why you can't change your
entity directly inside of the OnFlushDirty or OnSave overrides inside your
Interceptor.
If you review the code that calls the Interceptor you will understand this
well enough, but I will explain briefly. Before the Interceptor is called,
all of the data members from your entity are copied out into the
[]currentState. The state of the entity as it was loaded from the database
is in the []previousState. At the end of the Interceptor calls, the
[]currentState is copied out into the database.
If you wish to make changes to your entity directly I recommend you use
event listeners instead of the Interceptor. For example:
var aud = new AuditableSaveEventListener();
Configuration cfg = ...
cfg.EventListeners.SaveEventListeners = new ISaveOrUpdateEventListener[] {
aud };
cfg.EventListeners.SaveOrUpdateEventListeners = new
ISaveOrUpdateEventListener[] { aud };
class AuditableSaveEventListener : DefaultSaveEventListener
{
protected override object PerformSaveOrUpdate(SaveOrUpdateEvent
@event)
{
IAuditable entity = @event.Entity as IAuditable;
if(entity != null) entity.Audit();
return base.PerformSaveOrUpdate(@event);
}
}
public interface IAuditable
{
void Audit();
}
On Thu, Dec 18, 2008 at 4:18 AM, Stefan Sedich <[email protected]>wrote:
>
> I did think of this option but like to keep this all in my application
> the solution works nicely and I think I will stick with it for now.
>
>
>
> Cheers
> Stefan
>
> On Thu, Dec 18, 2008 at 9:17 PM, Fabio Maulo <[email protected]> wrote:
> > In this case I prefer a <generated> value by a trigger.
> >
> > 2008/12/18 Stefan Sedich <[email protected]>
> >>
> >> Hello,
> >>
> >> I am setting date last modified audit on an entity, I implement an
> >> IAuditableEntity interface and use a helper to set the date modified:
> >>
> >> public override bool OnFlushDirty(object entity, object id, object[]
> >> currentState, object[] previousState, string[] propertyNames,
> >> global::NHibernate.Type.IType[] types) {
> >>
> >> if
> >> (typeof(IAuditableEntity).IsAssignableFrom(entity.GetType())) {
> >>
> >> // If entity is auditable as this is only an update
> >> set the last modified date.
> >> SetValue(propertyNames, currentState, item =>
> >> item.LastModified, DateTime.Now);
> >>
> >> }
> >>
> >> return false;
> >> }
> >>
> >>
> >> Type safe helper:
> >>
> >> public void SetValue<T>(string[] propertyNames, object[] state,
> >> Expression<System.Func<IAuditableEntity, T>> propertyExpression, T
> >> value) {
> >>
> >> var memberExpression = propertyExpression.Body as
> >> MemberExpression;
> >> if (memberExpression == null)
> >> throw new ArgumentException("The member expression was
> >> not a valid member expression.");
> >>
> >> string name = memberExpression.Member.Name;
> >> int index = propertyNames.ToList().IndexOf(name);
> >>
> >> if(index == -1)
> >> throw new
> >> InvalidOperationException(string.Format("Property {0} does no exist on
> >> entity.", name));
> >>
> >> state[index] = value;
> >>
> >> }
> >>
> >>
> >> Now the question is, I saw that you must set the current state and not
> >> the entity directly why would
> >>
> >> var ent = entity as IAuditableEntity;
> >> ent.LastModified = DateTime.Now;
> >>
> >> Not work properly or will it be fine to do this?
> >>
> >>
> >>
> >> Thanks
> >>
> >> --
> >> Stefan Sedich
> >> Software Developer
> >> http://weblogs.asp.net/stefansedich
> >>
> >>
> >
> >
> >
> > --
> > Fabio Maulo
> >
> > >
> >
>
>
>
> --
> Stefan Sedich
> Software Developer
> http://weblogs.asp.net/stefansedich
>
> >
>
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