Hello,
I have a question about bidirectional one-to-many associations. Let's
consider we have a class Person which can hold a collection of
entities of type Car.
My mapping file for Car would have something like :
<many-to-one name="PersonID" cascade="none" column="PersonID" not-
null="true" />
and my mapping file for Person would contain :
<bag name="Cars" inverse="true" lazy="true" cascade="save-update">
<key column="PersonID" />
<one-to-many class="Car" />
</bag>
Now that implies that anytime I want to create a Car object I also
need to do :
myPerson = new Person()
myCar.person = myPerson
This is tedious and I don't want to have to do that. The problem is
that if I set the attribute inverse to false, then when I try to save
a Person, I get an exception because all the Car entities I've added
to this Person have a null CarID. If I set CarID to be not-null=false,
then there is no exception but it inserts null into my database.
How can I have NHibernate to automatically set the PersonID field of
each Car objects in my collection to the PersonID of the Person I just
saved ?
Hope this is clear enough
Thanks
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