Fabio, thanks for your reply. The reason author.Articles is null is
because the calling application created this Author instances and
assigned it an id. Something like this Author authorToDelete = new
Author() { AuthorID = 5 };. Once this is done this code (website)
sends it to the web service which than needs to delete the author,
however it also needs to delete all of its children. Being that the
object was created outside of the NH context, there is no proxy for
author.Articles when the web service receives it. I attempted to use
session.Lock and session.Merge, however there is still no proxy
instance for author.Articles, therefor I cannot delete the articles
directly by looping through author.Articles. Obviously I can query
the database to obtain the author object from the session and then use
it's proxy but I would love to avoid that select.
On Jul 29, 10:37 am, Fabio Maulo <[email protected]> wrote:
> To reattach an object to a session you have various
> ways.session.Lock(LockMode.None),
> session.Merge and so on.
> In your case I don't understand "author.Articles is always null" because
> the "author" instance come from another method out-side NH responsibility.
>
> 2009/7/29 e36M3 <[email protected]>
>
>
>
>
>
> > Hello all, after creating a sample web application POC using the
> > Entity Framework I am attempting to do the same with NH. I ran into
> > what is probably a very simple issue however I can't quite find the
> > solution. My web application is passing an Author object to my service
> > which then supposed to delete the author and all of its children
> > (Articles). I am not utilizing cascading delete so I am trying to nuke
> > those articles manually before I nuke the author, however I can't get
> > the author.Articles list to populate. In the below example
> > author.Articles is always null. I understand I must be missing
> > something regarding the disconnected nature of what I am attempting to
> > do here, but in Entity Framework I was able to simply attach my entity
> > to the ObjectContext (session in NH) and go from there as usual. I
> > recognize that I could simply query first for the Author instance
> > first, but the whole point is to avoid that query as I already have
> > that object being passed into the service. When I put a break-point
> > on the author I realize that there is no proxy class associated with
> > author.Articles, how do I get that proxy class to appear? Thank you.
>
> > public void DeleteAuthor(Author author)
> > {
> > using (ISession session = GetSession())
> > {
> > using (ITransaction tx = session.BeginTransaction())
> > {
> > try
> > {
> > foreach (Article article in author.Articles)
> > {
> > session.Delete(article);
> > }
>
> > session.Delete(author);
> > session.Flush();
> > tx.Commit();
> > }
> > catch (HibernateException)
> > {
> > tx.Rollback();
> > throw;
> > }
> > }
> > }
> > }
>
> --
> Fabio Maulo
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