DoesNotExist error in django view/template with one-to-one field

I have these models.

class Storypak(models.Model):
    headline = models.CharField('Headline', max_length=200)
    pub_date = models.DateField(blank=True)

class Story(models.Model):
    storypak = models.OneToOneField('Storypak', blank=True, null=True)
    copy = models.TextField(blank=True)

And this view.

def pak_detail(request, pak_id, year, month, day):
    pak = Storypak.objects.get(pk=pak_id)
    t = loader.get_template('storypak_detail.html')
    c = Context ({
        'pak' : pak,
        })
    return HttpResponse(t.render(c))

When I try to use an if statement in my template, a DoesNotExist error is thrown. The documentation I can find indicates that these开发者_开发问答 errors should be silenced. Shouldn't if pak.story resolve False and not throw an error? What am I missing? I think it may have something to do with the OneToOne relationship, but I can't find anything in the docs dealing with this specifically.

Here is the relevant template code as I remember it. I don't have the file on this computer. I'll fix it later if it isn't correct and possibly post the debug info if that would help.

{% if pak.story %}
    <p>{{ pak.story.copy }}</p>
{% endif %}

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here is a related bug: https://code.djangoproject.com/ticket/10227

here is the source for the if tag: https://code.djangoproject.com/browser/django/trunk/django/template/defaulttags.py#L267

as you see, the tag's render method does not catch anything but VariableDoesNotExist.

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You haven't given enough detail to troubleshoot much past the error here, but the simple error message can only be triggered by one statement in your view, that is...

pak = Storypak.objects.get(pk=pak_id)

The pak_id is either invalid, or your model is malformed and a Storypak with that id doesn't exist. That is the only call to an object that would raise a DoesNotExist error. You can verify it is a valid id by adding raise Exception(str(pak_id)) before this line to see what it is attempting to "get." Verify that record exists in the storypak table.