I have this definition in my upgrade script using migrate

meta = MetaData(migrate_engine)
DeclarativeBase = declarative_base(metadata=meta)
maker = sessionmaker(autoflush=True, autocommit=False,
                     extension=ZopeTransactionExtension())
DBSession = scoped_session(maker)
DBSession.configure(bind=migrate_engine)

class MarkerGraphic(DeclarativeBase):
    __tablename__ = 'marker_graphics'
    id = Column(Integer, primary_key=True)
    base_url = Column(Unicode,default="http://chart.apis.google.com/
chart")

class EventType(MarkerGraphic):
    __tablename__ = 'event_types'
    __mapper_args__ = {'concrete':True}

    id = Column(Integer, primary_key=True)
    name = Column(Unicode(60), nullable=False, unique=True)

    def __unicode__(self):
        return self.name

and when doing an upgrade, only the EventType columns are created in
the db (postgresql).

Is concrete not compatible with declarative?

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