When working with nh you should think, in general, as if you were working
without a persistence enviornment.
In a non persistence enviroment, you should put the item in the collection
if you want it there, also in NH.
The issue is that in general in NH in this case you put inverse="true" and
set that the other side (the many-to-one side) is going to be in charge of
the collection. Then if you get the entity again after saving the many to
one side you are going to get the collection "magically" loaded with the new
item.
In any case you should always add the item to both sides if you are mapping
each point of the relation, and this is by design.
Gustavo.
On Wed, Oct 22, 2008 at 8:30 AM, antoschka <[EMAIL PROTECTED]> wrote:
>
> Thanks, I do not fully understand the mechanism of the bags. Could
> somebody shortly explain me this.
>
> Lets say I retrieved Entities from a Database. All collections are
> initialized correctly. Now I got a transient entity lets say
> EntityA entityA = new EntityA();
> entityA.PropEntityB = someEntityB;
> If I do a session.Save(entityA) I have persisted it and NH knows about
> entityA having a property called PropEntityB of Type EntityB. Why
> isn't the collection updated automatically? It's clear that I want to
> have the persistent entityA in the collection EntityB.EntityAList?
>
> Thanks for your feedback
>
> antoschka
>
> On 3 Okt., 16:33, Paul Batum <[EMAIL PROTECTED]> wrote:
> > The typical approach would be:
> >
> > class EntityA
> > {
> > public void AddEntityB(Entity b)
> > {
> > this.EntityBList.Add(b);
> > b.EntityA = this;
> > }
> >
> > }
> >
> > I believe many people use this approach or something similar.
> >
> > On Oct 2, 7:26 pm,antoschka<[EMAIL PROTECTED]> wrote:
> >
> > > @ Fabio: So how would you approach the problem?
> >
> > > On 2 Okt., 13:58, "Fabio Maulo" <[EMAIL PROTECTED]> wrote:
> >
> > > > NH work as your DAL and don't play in your logical tier.
> >
> > > > 2008/10/2antoschka<[EMAIL PROTECTED]>
> >
> > > > > Hi,
> >
> > > > > I use one-to-many foreign keys in my entities. e.g. EntityA &
> EntityB
> > > > > - EntityB has a Property which references EntityA
> > > > > "<many-to-one name="EntityA " cascade="none" column="EntityA " not-
> > > > > null="true" />"
> >
> > > > > - EntityA has a inverse bag which contains all EntityBs referencing
> to
> > > > > EntityA
> > > > > "<bag name="FkEntityB" inverse="true" lazy="true" cascade="all">
> > > > > <key column="EntityA " />
> > > > > <one-to-many class="[class], [assembly]" />
> > > > > </bag>
> >
> > > > > The whole thing works fine. The only problem I have is when I add a
> > > > > transient new EntityB which references EntityA, hhe bag will not be
> > > > > updated and I have to do it manually, by adding EntityB to the bag-
> > > > > Collection.
> >
> > > > > How can this be done automatiaclly without making the new EntityB
> > > > > persistent?
> >
> > > > > Tahnska in advance for your helpantoschka
> >
> > > > --
> > > > Fabio Maulo
> >
>
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