On 2015-09-20 14:05 <c.bu...@posteo.jp> wrote:
> Instances of 'A' can have many references to instances of 'B'.
> I want to find all 'B' instances that are not referenced by an 'A'.

I am sorry. Of course I looked into the docs before. But for me it is
hard to get into its structure to find what I am looking for. And often
I don't use the correct search terms. This isn't for people speaking
like 6year olds. :)

I found a part of the docs
<file:///usr/share/doc/python-sqlalchemy-doc/html/orm/tutorial.html>

This looks like if it works.

session.query(B).filter(B.aaa == None).all()

This means I need the backref(). Would a query like this be possible
without it?
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