Problems on working with sa-continuum

[onlygecko]

Hello,

the example on the documentation page seems to be easy to run, but somehow I'm not getting it. Could someone show me, what I'm doing wrong?

import sqlalchemy as sa
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy import create_engine
from sqlalchemy_continuum import make_versioned

engine = create_engine('sqlite:////tmp/test.sql', echo=True)
Base = declarative_base()

make_versioned()

class Article(Base):
    __versioned__ = {}
    __tablename__ = 'article'

    id = sa.Column(sa.Integer, primary_key=True, autoincrement=True)
    name = sa.Column(sa.Unicode(255))
    content = sa.Column(sa.UnicodeText)

# after you have defined all your models, call configure_mappers:
sa.orm.configure_mappers()

Base.metadata.create_all(bind=engine)

Session = sessionmaker(bind=engine)
session = Session()

article = Article(name=u'Some article')
session.add(article)
session.commit()

The error I'm getting ist the following:
sqlalchemy_continuum.exc.ImproperlyConfigured: Could not build relationship between Transaction and User. User was not found in declarative class registry. Either configure VersioningManager to use different user class or disable this relationship

Thanks for your anwsers in advance. Peter

[onlygecko]

It's essential to pass the argument 'user_cls=None' to make_versioned() to run this example. It was hidden in the documentation.

make_versioned(user_cls=None)