The following code fails with AttributeError: 'NoneType' object has no 
attribute 'concrete':

from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import AbstractConcreteBase, 
declarative_base

Base = declarative_base()


class Document(Base, AbstractConcreteBase):
    type = Column(Unicode, nullable=False)


class ContactDocument(Document):
    __abstract__ = True

    send_method = Column('sendmethod', Unicode)


class ActualDocument(ContactDocument):
    __tablename__ = 'actual_documents'
    __mapper_args__ = {'concrete': True, 'polymorphic_identity': 'actual'}

    id = Column(Integer, primary_key=True)

configure_mappers()


Am I not supposed to have more than one level of abstract base classes? Or 
am I doing something else wrong?
This is with SQLAlchemy 0.9.7.

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