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))