Hi Jon,
you are right, if you want to create a mapping between OneObject and
ManyObject you have to add a foreignkey column to ManObject.
There is one other possibility. You can implement Persistence interface
and generate the relation by hand (code) in onLoad() method. As far as I
remember is this demonstrated somewhere in our example application.
Regards
Ralf
Jon Wilmoth schrieb:
> I'm using 1.2 JDO and I'm pretty sure I already know the answer to this
> question, but I thought I'd ask just in case I overlooked something. Is
> it possible to create a one-to-many JDO mapping where the column used on
> the many object doesn't refer to the ID of the one, but rather another
> column on the one object?
>
>
>
> For example if object model looked something like this:
>
>
>
> ManyObject
>
> -id (object id/pk)
>
> -name
>
> -category
>
>
>
> OneObject
>
> -id (object id/pk)
>
> -category
>
> -manyObjects (collection of 'ManyObject's where OneObject.category ==
> ManyObject.category)
>
>
>
> So the mapping would look something like:
>
> <field name="manyObjects" type="ManyObject" collection="vector">
> <sql many-key="category"/>
> </field>
>
>
>
> I believe the only way to do this currently would be to change
> "ManyObject" to add a fk field that held the value of OneObject.id.
>
> <field name="manyObjects" type="ManyObject" collection="vector">
> <sql many-key="one_object_id"/>
> </field>
>
>
>
> Thanks,
>
> Jon
>
>
>
> Thanks,
>
> Jon
>
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