On May 3, 2013, at 12:20 PM, Goran Popovic <[email protected]> wrote:
> Table Versions
>
> # ID
> # PARENT_ID
> # TEXT
>
> If parent_id == Null:
> its ORIGINAL
>
> if parent_id != Null:
> it's REVISION
>
> Is it possible to achieve this with polymorphic_identity?
>
> It seems that polymorphic_identity doesn't support NULL and not NULL
>
> __mapper_args__ = {
> 'polymorphic_identity':'original'
> }
not built in, but see the recipe at
http://www.sqlalchemy.org/trac/ticket/1409#comment:3 .
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