[baseten-users] one-to-many relationship strange behavior

[Michael Ruepp]

Hi,

thanks for the reply. I can confirm the bug to be the issue of the not  
working relationship. Now everything works as expected.

Mike

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On 10.09.2009, at 22:17, Tuukka Norri wrote:

> Hi again!
>
> I made a simple example on using a one-to-many relationship. It's  
> available in the repository at http://basetenframework.org/svn/trunk/Examples/OneToManyRelationship/
> I also fixed a bug which might have caused the wrong relationship to  
> be used when creating related objects.
>
>> Funny enough, whan I change the Data Model to a many-to-many  
>> relationship (Both sides cascade on delete) , I am able to create  
>> Projects and ProjectsItems and Selection behavior is as excpected  
>> (eg. Select a Project shows the respective ProjectItems created  
>> with the Project selected).
> OK, this is a bit strange, since many-to-many relationships should  
> require some additional work.
>
>> But when I delete a Project, the respective ProjectItems are not  
>> deleted as well, they reside in the Database without relationship.
> Unfortunately, making many-to-many relationships cascade on delete  
> isn't especially easy either, because they are implemented with a  
> link table. To me, making both sides cascade on delete wouldn't even  
> make much sense, since removing one object could very quickly  
> cascade to all objects. If you have a use case for this  
> functionality, though, we'll definitely consider adding it.
> -- 
> Best regards,
> Tuukka Norri
> MK&C
>
>
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