why not <joined-subclass> ?

On Thu, Dec 2, 2010 at 7:20 PM, Hendry Luk <[email protected]> wrote:

> Yes, in this case, because Employee has association to Company, and also
> other properties. Is there any other way to achieve that other than
> <subclass><join>?
>
>
> On Thu, Dec 2, 2010 at 11:32 PM, Fabio Maulo <[email protected]> wrote:
>
>> 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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-- 
Fabio Maulo

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