Re: [Modeling-users] Foreign Keys

[Yannick G. <yan...@sa...>]

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On July 21, 2003 11:41 am, Sebastien Bigaret wrote:
> > > Is there a way to do it without breaking anything ?
> >
> > Of course there is a way, just set the foreign key to be class property.
> >
> > Forgive me to post before proper re-caffeination !
>
> Oh oh, here you can get into very serious troubles. Demonstration, using
> test package AuthorBooks where I made Book's FK_Writer_Id a class

You're just too right !  re-caffeination is so slow after those lan parties...

[sniped problem demo]

>   What happened here? The FK is automatically set by the framework, by
>   examining the relationships. Since no object is related to book for
>   relation 'author', the FK gets overriden w/ the None value.
>
> That's an illustration of why PKs and FKs should be considered
> *read-only* when they are made class properties, as stated in the faq
> [http://modeling.sf.net/UserGuide/faq-change-class-location.html].

I might be nice to raise when trying to set a read-only property.

The solution with faultForRawRow() is easier to apply anyway.

- --
Yannick Gingras
Byte Gardener, Savoir-faire Linux inc.
(514) 276-5468

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