select_related and use_for_related_field

I have a custom manager class that has use_for_related_field set to true, and I set it to be the default manager in my model.  But when I make a query using select_related on the related field, I seem to get a plain queryset, not my custom one.  Here's a quick sketch of what I'm doing:

class MyQuerySet(models.query.QuerySet):

    @property

    def foo(self):

        return self.filter(foo=True)

class MyManager(models.Manager):

    use_for_related_field = True

    def get_query_set(self):

        return MyQuerySet(self.model)

class Widget(models.Model):

    thingies = models.ManyToManyField(Thingy, related_name='widgets')

    objects = MyManager()

When I run this query:

Thingy.objects.select_related('widgets').foo

Django tells me that

AttributeError: 'QuerySet' object has no attribute 'foo'

Is this something I should expect to work?  I seem to have reached the thin edge of both documentation and discussions.

John

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