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How can I update an object from a formset using request.POST ? Here is my code and my problem is that this always creates a new PhoneNumber object. But I want to update the old PhoneNumber object. def contact_detail(request, contact_id): contact = get_object_or_404(Contact, pk=contact_id) phone_number_list = PhoneNumber.objects.filter(contact=contact_id) if request.method == 'POST': cform = ContactForm(request.POST, instance=contact) #the next line is probably wrong! phonenumberformset = PhoneNumberFormSet(request.POST, queryset=phone_number_list) if cform.is_valid() and phonenumberformset.is_valid(): phonenumber_instances = phonenumberformset.save(commit=False) for phonenumber in phonenumber_instances: phonenumber.contact = contact phonenumber.save() request.user.message_set.create(message='The contact "%s" was chanced successfully.' % contact.__str__()) return HttpResponseRedirect("/crm/contacts/?oby=1") else: cform = ContactForm(instance=contact) phonenumberformset = PhoneNumberFormSet(queryset=phone_number_list) return render_to_response( 'crm/contact_detail.html', {'cform': cform, 'phonenumberformset': phonenumberformset,}, context_instance = RequestContext(request), ) Edit: I create three PhoneNumberForms: PhoneNumberFormSet = modelformset_factory(PhoneNumber, max_num=3, extra=3, exclude=('contact',)) Edit: The solution using inlineformset_factory: @login_required def contact_detail(request, contact_id): contact = get_object_or_404(Contact, pk=contact_id) PhoneNumberInlineFormSet = inlineformset_factory(Contact, PhoneNumber, max_num=3) if request.method == 'POST': cform = ContactForm(request.POST, instance=contact) classific

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