code: def save_to(self, obj):
          
          if isinstance(obj, dict):
              obj = dict(obj)
  
          for key in self.changed_fields:
              if key in self.cleaned_data:
                  val = self.cleaned_data.get(key)
                  set_obj_value(obj, key, val)
          return obj
docs: Save the cleaned data to an object.