I have a models file that looks similar to the following:

class WithDate(models.Model):
    adddedDate = models.DateTimeField(auto_now_add=True)
    modifiedDate = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True

class Match(WithDate):
    ...

class Notify(WithDate):
    matchId = models.ForeignKey(Match)
    headline = models.CharField(null=True, blank=True, max_length=10)

For each Match I'm trying to get a count of notify records that have a headline. So my call looks like

matchObjs = Match.objects.annotate(notifies_made=Count('notify__headline__isnull'))

This keeps throwing a FieldError. I've simplified the query down to

matchObjs = Match.objects.annotate(notifies_made=Count('notify'))

And I still get the same FieldError... I've seen this work in other cases (other documentation, other SO questions like this one) but I can't figure out why I'm getting an error.

The specific error that is returned is as follows:

Cannot resolve keyword 'notify' into field. Choices are: (all fields from Match model)

Does anyone have a clue as to why I can't get this annotation to work across tables? I'm baffled after looking at the other SO question and various Django docs where I've seen this done.

Edit: I am using Django 1.1.1