ok ppl i need an advice about my form view:
def myform(request):
idea_form = ProjectideaForm
activity_formset = inlineformset_factory(Projectidea, Activity,
extra=5)
if request.method == 'POST':
form = idea_form(request.POST)
formset = activity_formset(request.POST,
instance=Projectidea())
if form.is_valid and formset.is_valid: # All validation
rules pass
new_idea = form.save()
for f in formset.forms:
f.save(commit=False)
f.projectidea = new_idea
f.save()
return HttpResponseRedirect(new_idea.get_absolute_url())
else:
# An unbound form
form = idea_form()
formset = activity_formset()
return render_to_response('fslform.html', {
'form' : form,
'formset': formset,
})
this gives me
myform_activity.projectidea_id may not be NULL
how can i set the foreignkey of the inline forms to the actual parent
model?
every activity has a foreignkey to projectidea and both should be saved
in one hit.
bnl wrote:
> Thanks.
>
> Before I suggest anything concrete for the docs, let's see if my
> understanding is now right:
>
> The problem from my point of view was that I didn't think I had any
> hidden fields. Hence I didn't loop over them, and didn't think of
> them - yes, despite the massive hint in the error message ... :-(
>
> I think the hidden field in question was in fact the id of the
> instance (which exists for the previously saved objects) and was zero
> for a "blank" form in the formset ... and I think this only shows up
> as an issue when looping over forms in a formset, because the formset
> machinery has set up, modified, and uses this hidden field - and I
> didn't know it was there.
>
> (Or is it always there for anything generated by a ModelForm, and I've
> never spotted it because I always get my id from my url?)
>
> (Is this really an edge case? It seems like something one would want
> to do for nearly any interesting formset ... lay it out nicely ...)
>
> Cheers
> Bryan
>
> On Aug 11, 9:45 am, Malcolm Tredinnick <[email protected]>
> wrote:
>
>> On Tue, 2009-08-11 at 01:12 -0700,bnlwrote:
>>
>> [...]
>>
>>
>>> Apologies that I'm not asking my questions in the way you'd like,
>>> but believe me, I am cutting it down a lot ... and I appreciate that
>>> it's still not obvious where the errors are (I would have found
>>> them otherwise). In this case, I had cut it down to just field, and
>>> it
>>> exhibited the problem ... I shouldn't have included the extra line
>>> which was just to show why I wanted to do it ...
>>>
>> Trimming a problem report to the minimum required and no further is part
>> science and part black art, so there are going to be times when you just
>> get unlucky. In this case, however, the problem is you aren't including
>> details so that I or anybody else can actually reproduce the problem. So
>> you end up in a position where you have to hope the particular error
>> message triggers a "we've seen that before" thought in somebody's head.
>>
>> A good problem report or request for help contains enough information to
>> repeat the problem. Which means, in this case, the form class containing
>> the field.
>>
>>
>>
>>
>>> It would seem that the advice to loop over hidden fields in the
>>> template could be promoted to the documentation.
>>>
>> Well, we already document, in the main formset documentation, including
>> the management form if you're doing manual template layout
>> (http://docs.djangoproject.com/en/dev/topics/forms/formsets/#using-a-f...)
>> and we document including hidden fields if you're doing iteration over form
>> fields, in the main forms documentation,
>> (http://docs.djangoproject.com/en/dev/topics/forms/#looping-over-hidde...)
>> so this isn't undocumented territory.
>>
>> However, if you feel there's a clearer way to do this without giving it
>> undue prominence -- bearing in mind it's an edge case, so shouldn't
>> obscure the more regular usage cases or weigh those sections down with
>> heavy details -- then please do create a patch and attach it to a
>> ticket. Many of our documentation improvements are generated by people
>> trying to make something clearer.
>>
>> Regards,
>> Malcolm
>>
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