sqlalchemy, select using reverse-inclusive (not in) list of child column values

Question

I have a typical Post / Tags (many tags associated with one post) relationship in flask-sqlalchemy, and I want to select posts which aren\'t tagged with any tag in a list I prov

Answer 1

Try this one, easy:

users = session.query(Post).filter(not_(Post.tags.name.in_(['dont', 'want', these'])))

Hope this helps!