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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