Django cannot unpack non-iterable 'Q' object

Question

Im trying to use Q to make query in django. Database im using for this class is PostgreSQL.

My model is:

class DataSetPG(models.Model):
tower_code = models.CharField(max_length=20, null=False)
time_stamp = models.DateTimeField(default=datetime.now, null=True, blank=True)
value = models.CharField(max_length=200)

class Meta:
    ordering = ('tower_code',)

def __str__(self):
    return "%s" % self.tower_code

My view is asking for:

DataSetPG.objects.filter(Q(tower_code="something"))

But i got this error:

TypeError: cannot unpack non-iterable Q object

What I'm doing wrong? I tried .get instead of .filter and many many other kinds of stuff, but nothing. Im also using Q for querying in mongo database and works fine.

Just some more info. Using the normal query works: DataSetPG.objects.filter(tower_code="port525") — Pedro Faria
– Pedro Faria, Commented Mar 8, 2019 at 22:53
@17slim yes thats the problem, im importing: mongoengine.queryset.visitor How can i use two Q' from different classes? — Pedro Faria
– Pedro Faria, Commented Mar 8, 2019 at 23:15
from mongoengine.queryset.visitor import Q as MongoQ and from django.db.models import Q as DjangoQ — 17slim
– 17slim, Commented Mar 8, 2019 at 23:32

17slim · Accepted Answer · 2019-03-08 23:34:35Z

3

Putting my comment as an answer:

You can't use the Mongo Q as a Django Q to my understanding. You should instead import like so:

from mongoengine.queryset.visitor import Q as MongoQ
from django.db.models import Q as DjangoQ

With this, instead of Q(tower_code='something') use DjangoQ(tower_code='something'). Wherever you used the Q from mongoengine, replace it with MongoQ.

answered Mar 8, 2019 at 23:34

17slim

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1 Comment

Pedro Faria Over a year ago

Yes, that's it. I was already desperate with this and didn't pay attention to the import. Thank you.

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