It can be a problem in "transient state":
Parent p = new Parent();
Child c = new Child();
c.setParent(p);
assertTrue("parent must have a child", p.getChildren() != 0 );
there are two possible solutions :
1) implement "void setParent(Parent p){ this.p = p;
p.getChildren().add(this); }" manualy;
2) code generation and "abstract" managed methods ( "transparence" ).
I prefer "transparence", but it needs "Factory" if implementation is
generated at runtime or JDO style postprocessing if "new" is used to create
transient instances.
----- Original Message -----
From: "Max Rydahl Andersen" <[EMAIL PROTECTED]>
To: "hibernate list" <[EMAIL PROTECTED]>
Sent: Sunday, December 01, 2002 4:26 PM
Subject: Re: [Hibernate] Hibernate vs. Castor example
> > P.S. I'm not keen on the way you add items to bidirectional association.
> The
> > correct idiom is:
> >
> > parent.getChildren().add(child); file://yes, even if the children
> collection is
> > readonly="true"
> > child.setParent(parent);
> > sess.save(child);
> >
> > omitting the first line could cause bugs in more complicated
> circumstances.
>
> Hmm - isn't this idiom inefficient ?
> Doesn't parent.getChildren().add() (or any method on the collection)
result
> in loading all the children ?
>
> If the only intention is to add the child to the parent shouldn't the
> child.setParent(parent) be enough ?
>
> And then if I wish to have the parent in a "correct" state then I just do
a
> s.load(parent, parent.getId()) ?
>
> /max
>
>
>
>
>
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