Using your class definitions, it seems to work. What is different?
Base.metadata.bind=create_engine('sqlite:///')
Base.metadata.create_all()
session=sessionmaker()()
bk_ids = {}
for title in ('Tom Sawyer', 'Huck Finn'):
book = Book(title=title)
session.add(book)
session.flush()
bk_ids[title] = book.id
session.commit()
print bk_ids
for i, content in enumerate((
'Once upon a time there was a little fellow called Tom.',
'His surname was Sawyer.')):
page = Page(i, content, bk_ids['Tom Sawyer'])
session.add(page)
session.commit()
for page in session.query(Page):
print 'page:',page.id,' book:',page.book_id
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