Hibernate version:
NHibernate 1.2.0.Alpha1


Mapping documents:





My code
[code]
Movie class
public class Movies
{

private int id;
private IList<Imagens> lImagem;
...
}

Image class
public class Image
{
private int id;
private Movies movie;
...
}

-------------
Movie _movie = new Movie();
Ilist<Image> _list = new List<Image>;
Image _img = new Image();
_img.Link = "www.test.com"
_list.Add(_img);

_movie.lImg = _list;

ITransaction _tx = session.BeginTransaction();
session.SaveOrUpdate(_movie);
_tx.Commit(); <---- Error


ERROR
object references an unsaved transient instance - save the transient instance before flushing: BLL.Movies

[TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: BLL.Movies]
DAL.BaseDataAccess.Save(Object __item, Boolean __pointlessParameter) in D:\Util\Reps\MovieDB\trunk\MovieDB\DAL\BaseDataAccess.cs:113
DAL.BaseDataAccess.Save(BusinessBase __item) in D:\Util\Reps\MovieDB\trunk\MovieDB\DAL\BaseDataAccess.cs:90
Facade.FilmesFacade.Save(Movies__movie) in D:\Util\Reps\MovieDB\trunk\MovieDB\Facade\FilmesFacade.cs:28
Admin_Filmes_WFCadastro.btnIncluir_Click(Object sender, EventArgs e) in d:\Util\Reps\MovieDB\trunk\MovieDB\Web\Admin\Filmes\WFCadastro.aspx.cs:67
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102

you will need to add a <version> property to your Image class. SaveOrUpdate() relies upon the version property to determine if the object has "changed" or not. so you would end up with:



as an example using Int32s, Longs or DateTime (Timestamps) are also possible. See doco for more info. A note: the version property must appear immediately after the <id> property.

-devon

Thanks, but I got the same error... :(

d'oh! I wasn't looking at your code very closely. While I am not yet working with Generics in .NET, I think your problem is here:



With NH (and Hibernate) you can't assign a collection this way. You need to use the Add() method of the collection type to add each instance. So something like:



Sorry about the confusion. But my original note still stands. You must use <version> property with SaveOrUpdate().

-devon