>>> get_versioning_manager(Book)
<sqlalchemy_continuum.manager.VersioningManager object at 0x7fd619a7d0d0>

>>> get_versioning_manager(book_author)
...
  File "/home/abdealijk/venv/lib/python3.7/site-packages/sqlalchemy_continuum/utils.py", line 30, in get_versioning_manager
    raise ClassNotVersioned(cls.__name__)
sqlalchemy_continuum.exc.ClassNotVersioned: Table

from sqlalchemy import Column, ForeignKey, Integer, String, Table
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import configure_mappers, relationship
from sqlalchemy_continuum import get_versioning_manager, make_versioned


make_versioned(user_cls=None)
Base = declarative_base()

book_author = Table(
    "book_author",
    Base.metadata,
    Column("author_id", ForeignKey("author.id"), primary_key=True),
    Column("book_id", ForeignKey("book.id"), primary_key=True),
)


class Author(Base):
    __tablename__ = "author"
    __versioned__ = {}
    id = Column(Integer, primary_key=True)
    name = Column(String(255))

    books = relationship("Book", secondary=book_author, back_populates="authors")


class Book(Base):
    __tablename__ = "book"
    __versioned__ = {}
    id = Column(Integer, primary_key=True)
    name = Column(String(255))

    authors = relationship("Author", secondary=book_author, back_populates="books")


configure_mappers()