I think the problem in the original post was making Restaurant a subclass
of Place:
class Restaurant(Place):
That's why Django gave an error for the missing name and address.
With a OneToOne relation pointing from each Restaurant object to a Place
object, there's no need to include those fields in Restaurant. So it's not
a subclass of Place:
class Restaurant(models.Model):
(As shown in the One-to-one example. Thanks for the updated link.)
The other alternative is to keep the subclass, and remove the
OneToOneField. Then do:
for place in Place.objects.all():
restaurant = Restaurant(**{
'name': place.name,
'address': place.address,
'serves_hot_dogs': False,
'serves_pizza': True,
})
restaurant.save()
--Davi
On Wednesday, June 22, 2016 at 5:45:23 PM UTC-5, Malik Rumi wrote:
>
> This thread is obviously very old, but since it helped me find the answer,
> I thought I would share that for the benefit of others mystified by the
> lack of information on
> https://docs.djangoproject.com/en/1.9/topics/db/models/#multi-table-inheritance.
>
>
>
> It turns out that although Derek's link to the docs was way out of date
> (the page does not exist anymore) his solution was still close to correct.
> The full documentation can be found here:
> https://docs.djangoproject.com/en/1.9/topics/db/examples/one_to_one/
>
>
>
> On Thursday, November 4, 2010 at 1:25:25 PM UTC-7, Nan wrote:
>>
>> 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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