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

I thought up a nasty solution, but it works for the time being. I'd be interested to hear if anyone comes up with a smarter method.

ignore_ids = [item.post_id for item in Tag.query.filter(Tag.name.in_(['dont','want','these'])).all()]
Post.query.filter(Post.id.notin_(ignore_ids))

Answer 2

The notin_ works for me, adjusted example:

db.session.query(Post).filter(Post.tags.notin_(['dont','want','these'])) 

Answer 3

Pretty straightforward using negated any:

query = session.query(Post).filter(~Post.tags.any(Tag.name.in_(['dont', 'want', 'these'])))

Answer 4

Try this one, easy:

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

Hope this helps!