Why .filter() in django returns duplicated objects?

Question

I\'ve followed django tutorial and arrived at tutorial05.

I tried to not show empty poll as tutorial says, so I added filter condition like this:

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Answer 1

A little late to the party, but I figured it could help others looking up the same issue. Instead of using choice__isnull=False with the filter() method, use it with exclude() instead to exclude out any questions without any choices. So your code would look something like this:

    ...
    def get_queryset(self):
        return Question.objects.filter(pub_date__lte=timezone.now()).exclude(choice__isnull=True).order_by('-pub_date')[:5]

By doing it this way, it will return only one instance of the question. Be sure to use choice_isnull=True though.