If you don't want the foreign key (or another field) to be displayed
in the form you can define a formfield_callback:
def obj_callback(f, **kwargs):
"tell forms to ignore uwb foreign key & slug"
if f.name == "uwb" or f.name == "slug": # don't include uwb or slug
in the form
return None
return f.formfield(**kwargs)
then, when you instantiate the form:
form = forms.form_for_model(Mymodel, formfield_callback=obj_callback)
()
whether you displayed the foreign key or not, when its time to save
the changes you need to update the clean_data with the proper foreign
key:
if request.method == 'POST':
form = forms.form_for_model(Mymodel,
formfield_callback=obj_callback)(request.POST)
if form.is_valid():
form.clean_data['uwb'] = get_correct_uwb()
n = Mymodel.objects.filter(uwb=uwb).count() + 1 #get count of
objects
form.clean_data['slug'] = 'Object%d'%(n)
form.save()
return HttpResponseRedirect(...)
and finally, if you are using form_for_instance, to update an existing
instance, you can't use the form.save - instead try something like
this:
form = forms.form_for_instance(obj, formfield_callback=obj_callback)
(request.POST)
if form.is_valid():
for i in form.clean_data:
obj.__setattr__(i, form.clean_data[i])
obj.save()
return HttpResponseRedirect(...)
Hope this helps!
-chasfs
On Jan 29, 2:52 pm, "sandro.dentella" <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> I'm trying to learn newforms. I create a form with form_for_model
> and now presenti it in the template. A foreign key renders as a select
> widget, that is ok, but how can I limit the values filtering them out?
>
> Should I pass the widget when creating the Form using
> formfield_callback? Can I change the values after the Form is created?
> (or after the instance is created?)
>
> Thanks in advance
> sandro
> *:-)
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