I have a class User, that has a property Event, which has many Sessions. Basically, a user register to an event which have many sessions hours.
The user can register for an event, but the sessions hours are purely informative.
But when I write a user to the database with NH, it updates the sessions hours too. How can I prevent that, knowing that I still need the sessions hours to be inserted/updated when I create/update an event.
This might not totally apply to your question, but I've had issues where I wanted to conditionally cascade deletes based on certain business rules.
A lot of the times, you can handle this in your persistence logic. I had a case where I went with NHibernate Event Listeners.
public class ConditionalDeleter: IPostDeleteEventListener
{
public void OnPostDelete(PostDeleteEvent @event)
{
var foo = @event.Entity as Foo;
if (foo != null)
{
if (foo.ShouldDeleteBar)
{
ISession session = @event.Session.GetSession(EntityMode.Poco);
session.Delete(foo.Bar);
session.Flush();
}
}
}
}