I have a query which tries to get list of users for a particular set of
events which joins with the user table to check if the user is not marked
for a particular flag "dnd" (flag column could have a null value too). The
query goes something like this:
query = session.query(Event.uid).filter(Event.event.in_(event_list)).\
join(User, and_((User.id == Event.uid), \
or_(User.flag == None, User.flag != "dnd")))
It raises an Argument error exception
ArgumentError("Only '=', '!=', 'is_()', 'isnot()' operators can
be used with None/True/False",)
I've tried other possibilities/suggestions (listed below) but still get the
same error:
- using # noqa
- checking "User.Flag is None"
- checking "User.Flag.is_(None)"
In other places, when I'm checking only with the User table without a join,
it seems to work. For eg:
User.query.filter(User.flag == None, User.flag != "dnd").all()
works.
DB being used is postgresql.
How do I check for NULL value within this join?
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