Of course! The mistake is that I didn't have the ID in the URL, but I
took the partner to be edited somewhere from the session. I'll change
the code and it should work as expected.
Thanks again for your patience
Marc
On Jul 21, 10:57 pm, Daniel Roseman <dan...@roseman.org.uk> wrote:
> 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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