python - Django: Updating Object in Forms with Custom Save Method -

this continuation of this question, in learned how over-ride save method of multi-step formwizard save form fields differently in different forms. @yuji tomita's help, figured out how save forms correctly. @ point, however, lost on how update instance , save changes object.

i have tried follow logic learned @yuji, have not been able update object.

this am:

class steponeform(forms.form):      ...      def save(self, thing):         field, value in self.cleaned_data.items():             setattr(thing, field, value)  class steptwoform(forms.form):      ...      def save(self, thing):         field, value in self.cleaned_data.items():             setattr(thing, field, value)  class stepthreeform(forms.form):      ...      def save(self, thing):          thing.point = point.objects.get_or_create(latitude=self.cleaned_data.get('latitude'), longitude=self.cleaned_data.get('longitude'))[0]          field, value in self.cleaned_data.items():              setattr(thing, field, value) 

here how have over-written wizard's done method save instances:

class mywizard(sessionwizardview):     file_storage = filesystemstorage(location=os.path.join(settings.media_root))     def done(self, form_list, **kwargs):         id = form_list[0].cleaned_data['id']         try:             thing = thing.objects.get(pk=id)             instance = thing         except:             thing = none             instance = none         if thing , thing.user != self.request.user:             raise httpresponseforbidden()         if not thing:             instance = thing()             form in form_list:                 form.save(instance)             instance.user = self.request.user             instance.save()         return render_to_response('wizard-done.html', {                 'form_data': [form.cleaned_data form in form_list],}) 

how should change save method can update thing instance? ideas!

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edit: adding view edits object:

def edit_wizard(request, id):     thing = get_object_or_404(thing, pk=id)     if thing.user != request.user:         raise httpresponseforbidden()     else:         initial = {'0': {'id': thing.id,                        'year': thing.year,                        'color': thing.color,                        ... #listing form fields individually populate initial_dict instance                        },                    '1': {image': thing.main_image,                        ...                        },                    '2': {description': thing.additional_description,                        'latitude': thing.point.latitude,  #thing has foreign key point records lat , lon                        'longitude': thing.point.longitude,                        },                     }          form = mywizard.as_view([steponeform, steptwoform, stepthreeform], initial_dict=initial)         return form(context=requestcontext(request), request=request) 

what problem seeing? error or object not saved?

probably indentation in done() method not correct, not calling form.save(). should :

class mywizard(sessionwizardview):     file_storage = filesystemstorage(location=os.path.join(settings.media_root))     def done(self, form_list, **kwargs):         ...          #existing code          if not thing:             instance = thing()          #this moved out of if         form in form_list:             form.save(instance)          instance.user = self.request.user         instance.save()         return render_to_response('wizard-done.html', {                 'form_data': [form.cleaned_data form in form_list],})