assoc proxy example uses bi-directional relation w/o backrefs

[jek]

mapper(User, users_table, properties={
    'user_keywords': relation(UserKeyword)
})
mapper(Keyword, keywords_table)
mapper(UserKeyword, userkeywords_table, properties={
    'user': relation(User),
    'keyword': relation(Keyword),
})

check into that and likely change User/UserKeyword to be a single relation w/ backref

[jek]

837f71eca5e569323e61e6937e85b9944258f870

[Mike Bayer]

Removing milestone: 0.5.xx (automated comment)