Multi-table Inheritance: How to add child to parent model?

[ringemup]

I have an existing model that I want to extend using multi-table
inheritance.  I need to create a child instance for each parent
instance in the database, but I can't figure out how.  I've scoured
google and haven't come up with anything other than Ticket #7623[1].
Here are some of the things I've tried...

Let's adapt the Place / Restaurant example from the docs:

class Place(models.Model):
    name = models.CharField(max_length=50)
    address = models.CharField(max_length=80)

class Restaurant(Place):
    place = models.OneToOneField(Place, parent_link=True,
related_name='restaurant')
    serves_hot_dogs = models.BooleanField()
    serves_pizza = models.BooleanField()

I want to do the following, in essence:

for place in Place.objects.all():
  restaurant = Restaurant(**{
    'place': place,
    'serves_hot_dogs': False,
    'serves_pizza': True,
  })
  restaurant.save()

Of course, doing this tries to also create a new Place belonging to
the new Restaurant, and throws an error because no values have been
specified for the name and address fields.  I've also tried:

for place in Place.objects.all():
  restaurant = Restaurant(**{
    'serves_hot_dogs': False,
    'serves_pizza': True,
  })
  place.restaurant = restaurant
  place.save()

This, however, doesn't create any records in the restaurant table.

Any suggestions?

[1] http://code.djangoproject.com/ticket/7623

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