Is the Parent/Child Mapping example working (page 65 of pdf guide)?
I create a Child and add it to Parent, shouldn't Nhibernate save the Child on its own?

Did you set the Parent property of the Child? The parent collection of a P-C relationship is not controlling, the *-1 relation on the child is. However, cascading won't work unless you add the Child to the collection, too. So, you realy do need to do both.

Don't know which version of the PDF you have, does it match this?

I think is that version, at least is the one shipped with the installer.
I made the changes to match those in the link, but I have a question:

when I save a parent (after adding the child) shouldn't the child be saved and parent_id filled with the id of the parent table?

I copied the full example and it doesn't work.

The error is:


[ArgumentException: No mapping exists from DbType UInt64 to a known SqlDbType.]

[ADOException: could not insert: [EuroEstates.Model.Licitacao][SQL: INSERT INTO Licitacao (Valor, LeilaoId) VALUES (?, ?)]]

I believe is the mapping of the Parent class in the child class.


Parent Class:
<set name="Licitacoes" table="Licitacao" inverse="true">
<key column="LeilaoId"/>
<one-to-many class="Licitacao" />
</set>

Child Class:
<many-to-one name="Auction" class="Leilao" column="LeilaoId" not-null="true" />

SOLVED

same problem in this post:

http://forum.hibernate.org/viewtopic.php?t=978192