Chris Withers wrote:
> Hi Again,
>
> So here's a test case ready to drop onto the end of test_declarative.py:
>
> def test_mapper_args_single_table(self):
>
> class TableNameMixin:
> @classproperty
> def __tablename__(cls):
> return cls.__name__.lower()
>
> class CommonColumns:
> id = Column(Integer, primary_key=True)
>
> class BaseType(Base, TableNameMixin, CommonColumns):
> discriminator = Column('python_type', String(50))
> __mapper_args__= dict(polymorphic_on=discriminator)
> value = Column(Integer())
>
> class SpecificType1(BaseType):
> __mapper_args__ = dict(polymorphic_identity='type1')
>
> class SpecificType2(BaseType):
> __mapper_args__ = dict(polymorphic_identity='type2')
>
> "between '%s' and '%s'.%s" % (a.description, b.description, hint))
> ArgumentError: Can't find any foreign key relationships between
> 'basetype' and 'specifictype1'.
>
> *sigh* Any ideas?
> (I'll be looking further into this, but thought I'd chuck it at the
> tlist in case I'm missing anything obvious)
are you wondering....*why* this happens ? its because your mixin is
giving all classes a __tablename__. If you want to force SpecificType1/2
to be single-inherited from Base, they'd need their own __tablename__ set
to None. Which you can achieve declaratively in each class or via another
mixin.
>
> cheers,
>
> Chris
>
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