python - SQLAlchemy Bidirectional Association Proxy -

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i'm trying create simple many many relationship mapping table containing metadata relationship represents association proxies on both ends using sqlalchemy. however, can't seem work. here's toy example i've been working try figure out:

base = declarative_base()   def bar_creator(bar):      _ = foobar(bar=bar)     return bar   class foo(base):      __tablename__ = 'foo'      id = column(integer, primary_key=true)     name = column(string)     bars = association_proxy('bar_associations', 'bar',                              creator=bar_creator)   def foo_creator(foo):      _ = foobar(foo=foo)     return foo   class bar(base):      __tablename__ = 'bar'      id = column(integer, primary_key=true)     name = column(string)     foos = association_proxy('foo_associations', 'foo',                              creator=foo_creator)   class foobar(base):      __tablename__ = 'foobar'      foo_id = column(integer, foreignkey('foo.id'), primary_key=true)     bar_id = column(integer, foreignkey('bar.id'), primary_key=true)     bazed = column(boolean)     foo = relationship(foo, backref='bar_associations')     bar = relationship(bar, backref='foo_associations')   base.metadata.create_all(engine) make_session = sessionmaker(bind=engine) session = make_session() foo0 = foo(name='foo0') session.add(foo0) bar0 = bar(name='bar0') foo0.bars.append(bar0)

i added creator functions avoid writing __init__ won't work actual use case (takes single argument), , included creation of foobar in each because read in of documentation item being appended needs have linking table instance associated it. i'm sure i'm missing obvious (or maybe trying can't done), after digging through docs , googling, can't figure out why doesn't work. doing wrong?

your problem lies in creator: should return new instance of foobar , not bar or foo:

def bar_creator(value):     return foobar(bar=value)

and analogous foo_creator.


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