I do not understand why I would want to share a declarative_base() between
packages. I think there has just been some confusion between the idea of
sharing a session (useful) with the idea of sharing a declarative_base()
(problematic). The following setup, each class having its own
declarative_base(), works great and it gives you predictable
Base.metadata.create_all(connection) behavior in each of your unrelated,
may-not-have-imported-each-other-yet packages.
class A(declarative_base()): __tablename__ = 'a' a_id = Column(Integer,
primary_key=True)
class B(declarative_base()): __tablename__ = 'b'
b_id = Column(Integer, primary_key=True)
a_id = Column(Integer, ForeignKey(A.a_id))
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