You mean "trying to add a Restaurant which is linked to an existing place"
I am not familar with the syntax you are using for the **{} wrapper.
The original example shows:
r = Restaurant(place=p1, serves_hot_dogs=True, serves_pizza=False)
and the attached note says:
Pass the ID of the "parent" object as this object's ID.
Are you sure that the place ID is, in fact, what is being transferred?
On 5 November 2010 15:59, ringemup <ringe...@gmail.com> wrote:
> I'm not trying to create a Restaurant without a name and address. I'm
> trying to turn an existing Place into a Restaurant.
>
> On Nov 5, 9:42 am, derek <gamesb...@gmail.com> wrote:
> > Its not clear exactly what you think the problem is. The system is
> > behaving correctly ito the way you have set it up.
> >
> > 1. You have specified that name and address are compulsory fields in
> > Place.
> > 2. You have specifed that Restaurant must be linked to Place (i.e.
> > Place must be created before Restaurant can be created)
> >
> > So why would you now want an entry in Restaurant that does _not_ have
> > a name and address?
> >
> > On Nov 4, 10:25 pm, ringemup <ringe...@gmail.com> 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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