are you using <subclass>+<join> for some special reasons ?

On Thu, Dec 2, 2010 at 6:45 AM, Hendry Luk <[email protected]> wrote:

> Hello,
> Is there any way to make one-many bag association from an entity to a
> subclass (with join)?
> Just an isolated example:
>
> <class name="Person">
> <!-- blah blah -->
> <discriminator column="PersonType" />
> </class>
>
> <subclass name="Employee" discriminator-value="Employee">
> <!-- blah blah -->
> <join table="Emplooyee">
>   <key column="PersonId" />
>   <many-to-one name="Company" column="CompanyId" class="Company" />
> </join>
> </subclass>
>
> <class name="Company">
> <!-- blah blah -->
> <bag name="Employees">
>   <key column="CompanyId" />    ---------------> this fails
>   <one-to-many class="Employee" />
> </bag>
> </class>
>
> That bag will fail because it will seek CompanyId under Person table,
> instead of from the Employee table, which is understantable. But my question
> is if it's possible to achieve what I am going for. I cannot use
> joined-subclass, because in my real case (NotificationPolicy base-class),
> most of the subclasses don't have additonal properties (only different
> behavior), hence discriminnator column is more appropriate. Only in certain
> subclass do I need to join with another table for additional properties, but
> in NHibernate I'm not allowed to mix subclass and joined-sublass on the same
> inheritance hierarchy.
> Does anyone have any solution or workaround to make the above example work?
>
> Thanks
>
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-- 
Fabio Maulo

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