python - SQLAlchemy: filter by relationship -


i have 2 tables, user , object, have one-to-many relationship (a user can have many objects ).

how can filter users have @ least 1 object, in pep8 compliant way?

this code works, not pep8-compliant:

query = session.query(user.id) query = query.filter(user.objects != none)

the documentation mentions using isnot: http://docs.sqlalchemy.org/en/rel_1_0/orm/tutorial.html#common-filter-operators

but following code gives rise not implemented error.

query = session.query(user.id) query = query.filter(user.objects.isnot(none))

as pointed out, isnot not implemented relationships, simple columns.

as relationships, there general more powerful construct any(criterion, ...).

in case can write pep8-compliant code below, produce same sql in question:

q = session.query(user.id) q = q.filter(user.objects.any())

but allows more complicated queries, like: return users, not have objects value > 100:

q = session.query(user.id) q = q.filter(~user.objects.any(object.value > 100))

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