Hello Claudio!
You have to create a join table. It can be done from the Modeler.
http://www.objectstyle.org/cayenne/modelerguide/modeling-object-layer/
flattenedrel.html
Regards,
- Tore.
On Jul 1, 2004, at 6:02, Claudio Rosati wrote:
> Hello all,
>
> I have two classes, Record and Collocation, that should have a
> many-to-many relation, like the one in the picture.
>
> <image.tiff>
> Each class is backed by a corresponding DbEntity (records and
> collections). These entities contains just one attribute: a primary
> key VARCHAR[64] one called uid, reflected into the corresponding
> class as the uid String attribute.
>
> What I would like is the situation depicted, where when I add a
> Collocation to a Record using the addToCollocations method, the
> corresponding list of Records in the Collocation object is updated
> automatically.
>
> Being ignorant about DBs and their management (this is why I'm using
> Cayenne), I don't understand if it is possible and how to realize it
> with Cayenne (and its modeler): I need to add some attributes to the
> DbEntities (which one?), I need to add helper tables (whicwh one?),
> Which kind of relation I need to set up...?
>
> Thanks in advance for any help.
>
> Claudio
>
>
>
> <image.tiff>Multimedia Division
>
> Claudio Rosati
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> Advanced Computer Systems S.p.A.
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> Italy
>
> claudio.rosat..csys.it
>
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