is that something looking like real concrete-polymorphism?
AFAIremember there was something composite there in the pattern.. the id is 
actualy (id,type)

Michael Bayer wrote:
> you cant do it right now.  but its something we could support.   its  
> unclear to me if we should just go for "composite types" as the way to  
> do it, or just use a callable.   using a composite is likely cleaner  
> and would integrate with the "save" process better (otherwise, the  
> callable needs to generate the "discriminator" value at save time as  
> well).
> 
> On Dec 3, 2007, at 11:09 AM, Koen Bok wrote:
> 
>> I'd like to make a polymorphic mapper based on two columns. Is that
>> possible?
>>
>> See example code here: http://paste.pocoo.org/show/13799/
>>
>> Thanks, Koen
> 
> 
> > 


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