[sqlalchemy] is it two or more levels of polymorphism possible?

[Richard Gerd Kuesters]

hi all,

i was wondering if there's a way to create more than one level of 
polymorphic entities in sa. quick example:

   class Foo(Base):
        ...
        __mapper_args__ = { ... }

   class Bar(Foo):
        ...
        __mapper_args__ = { ??? }  # <--- polymorphic_identity for ... two?


   class Baz(Bar):  # <--- is this possible?
       ...



cheers,
Richard.

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