The id is generate by the database engine, not SQLAlchemy, so session.add()
does nothing to push your object to the database and generate the id. You
need to execute session.flush() after session.add() to write the book to the
database and generate the id. After the flush() operation, the book id is
available to save in your dictionary.
something like this:
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()
Without the flush(), the id will be NULL.
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