Without to_field, it works. But, setting to_field to name, you can
simply type name in the input field of django admin, instead of id.
I am just wondering why the api behaves differently if to_field is set
to another field other than id.
We create like this:
>>> pet = Pet.objects.create(owner=person, name='B')
But, we have to get like this:
>>> pet = Pet.objects.get(owner=person.name, name='B')
Hence, we cannot get_or_create
On 8月10日, 上午9时37分, Renne Rocha <rennero...@gmail.com> wrote:
> Try defining the pet model like this:
>
> class Pet(models.Model):
> owner = models.ForeignKey(Person)
> name = models.CharField(max_length=30)
>
> Than it will work.
>
> On Fri, Aug 6, 2010 at 7:25 AM, bhuztez <bhuz...@gmail.com> wrote:
> > I have my models declared in this way:
>
> > class Person(models.Model):
> > name = models.CharField(max_length=50, unique=True)
>
> > class Pet(models.Model):
> > owner = models.ForeignKey(Person, to_field='name')
> > name = models.CharField(max_length=30)
>
> > def __unicode__(self):
> > return self.name
>
> > I got empty list when trying to get pets from its owner.
>
> > >>> person = Person(name='A')
> > >>> person.save()
> > >>> pet = Pet(owner=person, name='B')
> > >>> pet.save()
> > >>> Pet.objects.filter(owner=person)
> > []
> > >>> Pet.objects.filter(owner__in=Person.objects.all())
> > []
>
> > It works as expected with explicit id
> > >>> Pet.objects.filter(owner__id=person.id)
> > [<Pet: B>]
>
> > Pet.objects.filter(owner__id__in=Person.objects.all().values_list('id',
> > flat=True))
> > [<Pet: B>]
>
> > Setting owner to the name of the person works also
> > >>> Pet.objects.filter(owner=person.name)
> > [<Pet: B>]
>
> > I didn't find any document on this, is this a convention, or this is a
> > bug?
>
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