I ran into this problem, and it's unclear to my why it doesn't work. I
looked carefully in the documentation and can't see that it should be
an illegal operation, but still, I seem to recieve no results from the
query.
What I'm trying to do is to fetch all the rows in a datastore model
that has a specific userproperty-value AND something newer than a
certain date on a datetimeproperty.
Currently, it looks like this:
class UserTrack(db.Model):
user = db.UserProperty() # Google user
parentpost = db.ReferenceProperty(reference_class=Post,
collection_name='usertrack_parentpost_tasks')
lastvisit = db.DateTimeProperty(auto_now=True)
(...)
user = users.get_current_user()
datetime_of_current_visit = datetime.utcnow()
usertrackquery = UserTrack.all()
usertrackquery.filter('user =', user)
usertrackquery.filter('lastvisit >', datetime_of_current_visit)
usertracks = usertrackquery.fetch(limit=25)
If I delete either of the two filters (on user OR on lastvisit) I get
results, but if I take the two together the datastore always returns
None (without an error). I know for sure that some of the rows are
true for both of the two conditions, but still I get None. (actually,
if none of the rows would match I would still get an empty list, and
not None).
Did I break the policy of equality filters and is that why it doesn't
work? If so how? Any ideas?
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