Removed unused ForeignObject.attnames/get_defaults().

    def get_transform(self, *args, **kwargs):

        raise NotImplementedError('Relational fields do not support transforms.')

    @property

    def attnames(self):

        return tuple(field.attname for field in self.local_related_fields)

    def get_defaults(self):

        return tuple(field.get_default() for field in self.local_related_fields)

    def contribute_to_class(self, cls, name, private_only=False, **kwargs):

        super(ForeignObject, self).contribute_to_class(cls, name, private_only=private_only, **kwargs)

        setattr(cls, self.name, ForwardManyToOneDescriptor(self))