form = MyForm(instance=z)
if (request.method == 'POST'):
form = MyForm(request.POST, instance = z)
if (form.is_valid()):
z = form.save()
z.save()
return HttpResponseRedirect('redirect to success page')
return render_to_response("render to form page",{'form':form})
On Mon, Dec 7, 2009 at 5:58 PM, Daniel Roseman <dan...@roseman.org.uk>wrote:
> On Dec 7, 12:22 am, Continuation <selforgani...@gmail.com> wrote:
> > I have:
> >
> > class MyModel(models.Model):
> > fk = models.ForeignKey(AnotherModel)
> > field = models.PositiveIntegerField()
> >
> > class MyForm((forms.ModelForm):
> > class Meta:
> > model = MyModel
> >
> > Now I want to create a form to edit an existing MyModel instance. But
> > I don't know the pk of the instance. However I do now the value of fk
> > & field, which together should be enough to uniquely identify an
> > instance.
> >
> > So I do:
> > z = MyModel.objects.get(fk=o, field=f)
> > f = MyForm(instance=z)
> >
> > And the form f does have the correct data of z pre-populated.
> >
> > However when I submitted the form, a new MyModel object was created
> > instead of just updating z.
> >
> > What do I need to do to create a form that would update z?
>
> You don't need to do anything. If you've correctly passed in the
> instance, it will always edit the existing one. I imagine that you've
> used the instance when creating the form on GET, but have forgotten to
> do so when creating it on POST:
>
> f = MyForm(request.POST, instance=z)
>
> --
> DR.
>
> --
>
> You received this message because you are subscribed to the Google Groups
> "Django users" group.
> To post to this group, send email to django-us...@googlegroups.com.
> To unsubscribe from this group, send email to
> django-users+unsubscr...@googlegroups.com<django-users%2bunsubscr...@googlegroups.com>
> .
> For more options, visit this group at
> http://groups.google.com/group/django-users?hl=en.
>
>
>
--
Gaffar Durmaz - Software Engineer
http://www.gaffarovercomes.com
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To post to this group, send email to django-us...@googlegroups.com.
To unsubscribe from this group, send email to
django-users+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en.
