So I sloved my problem with QuerySet - while creating the ModelForm
instance, there should be passed instance argument, not only POST or
GET, so that the ModelForm could "know" if there should be edition of
existing model or creating a new one.
Regards,
Marek
Marek
Marek Wawrzyczek wrote:
> Hi,
> I've got the following class:
>
> CarForm(ModelForm):
> def __init__(self, *args, **kwargs):
> super(CarForm, self).__init__(*args, **kwargs)
> id = self.instance.id
> qs = CarPhoto.objects.filter(car__id = id)
> self.fields['main_image'] = forms.ModelChoiceField(qs)
> class Meta:
> model = Car
>
> I would like to allow user to choose the main photo for a car only
> from photos assigned to this car. The code above doesn't work, but
> when changed to:
> qs = CarPhoto.objects.filter(car__id = 1)
> then the field "main_image" has only the photos associated with the
> car which id is 1. The model classes are (simplified for clarify):
>
> class Car(models.Model):
> main_image = models.ForeignKey('CarPhoto', related_name =
> 'car_main_image', blank = True, null = True)
>
>
> class CarPhoto(models.Model):
> image = models.ImageField( upload_to = 'car_photos/')
> car = models.ForeignKey(Car)
>
> Another strange thing is that while trying (in form's __init__ method) do
> print kwargs
> then
> {'instance': <Car: Car object>}
> was printed. But while doing
> print kwargs['instance']
> then "key error" was printed on a page, and the debugging message was:
> (...)
> 51. print kwargs['instance'] ...
> Local vars
> (...)
> kwargs {}
> (...)
>
>
> How can I get the instance's id in the ModelForm's __init__ properly
> so that the QuerySet would result only photo's associated with car id
> equals to instance's id? Why the kwargs behaves so strange?
>
> Thanks in advance,
> Marek
>
>
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