- September 9, 2007
- forms model partial updating
- 7 (after 7 ratings)
If you're like me, you've got a models with a lot of fields/foreignkeys and often only want to edit a portion of the model in a form. Add this method to your custom form class and use it in place of the save() method.
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""" Add this method to a custom form to use as an alternative to the save method. When passed an object instance, the it will set values on the model corresponding to matching field names on the form. Example: myobject = MyObject.objects.get(pk=1) form = MyForm(request.POST) if form.is_valid(): form.update_instance(myobject) """ def update_instance(self,instance,commit=True): for f in instance._meta.fields: if f.attname in self.fields: setattr(instance,f.attname,self.cleaned_data[f.attname]) if commit: try: instance.save() except: return False return instance