well it will "work" if you say this:
class PolymorphicMixin(object):
discriminator = Column('discriminator', types.String(50))
@declared_attr
def __mapper_args__(cls):
ret = {'polymorphic_identity': cls.__name__}
if Base in cls.__bases__:
ret['polymorphic_on
Is it possible to make a generalized declarative mixin class that
abstracts away all of the syntax of inheritance? I've seen examples
that set up the __mapper_args__ but not the discriminator column, and
examples that set up the discriminator column but not the
__mapper_args__, but none with both.
