On Jul 21, 9:34 pm, mettwoch <mettw...@pt.lu> wrote:
> I'd like this to work:
>
> class PartnerForm(forms.ModelForm):
> class Meta:
> model = Partner # I expect that all fields are included in
> the form (the 'id' field as well)
>
> def partner_new(request):
> form = PartnerForm()
> return render_to_response('pos.html', {'form': form},
> RequestContext(request))
>
> def partner_edit(request):
> form = PartnerForm(instance = request.session['partner'])
> return render_to_response('pos.html', {'form': form},
> RequestContext(request))
>
> def partner_save(request):
> if request.POST.get('id', None):
> form = PartnerForm(request.POST, instance = get_object_or_404
> (Partner, pk = request.POST['id']))
> else:
> form = PartnerForm(request.POST)
> if form.is_valid():
> form.save()
> return render_to_response('pos.html', {}, RequestContext
> (request))
> else:
> return render_to_response('pos.html', {'form': form},
> RequestContext(request))
>
> here's an excerpt of the pos.html:
>
> {% if form %}
> <form method="POST", action="{% url partner_save %}">
> <table>
> {{ form.as_table }}
> </table>
> <input type="submit" value="save" />
> </form>
> ...
>
> as I said: maybe I'm on the wrong track with ModelForm ...
Well, yes. What you've posted doesn't make any sense at all. You want
to get the id from the form, so that you can get the instance from the
database to pass to the form so it can get the id! This is obviously
circular. At some point, you've got to tell the form what the id
actually is, and that means passing it in to the page where you first
render the form. If you don't have an id, you pass a blank instance,
and a new row will be made in the database. If you do have one, pass
the instance with that id, and the existing row will be edited.
Various people have posted more or less complex code to do this, but
the simplest is like this:
def my_form_view(request, partner_id=None):
if partner_id:
partner = Partner.objects.get(id=partner_id)
else:
partner = Partner()
if request.POST:
form = PartnerForm(request.POST, instance=partner)
if form.is_valid():
form.save()
return HttpResponseRedirect('/')
else:
form = PartnerForm(instance=partner)
return render_to_response('pos.html', {'form': form},
RequestContext(request))
One final thing - make your form action="." so it posts back to the
same URL, ie the one with the partner_id.
That's all there is to it - nothing complicated at all.
--
DR.
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