docs: def save(self, force_insert=False):
          """
          Save the model and any related many-to-many fields.
  
          :param force_insert: Should the save force an insert?
          :return: Number of rows impacted, or False.
          """
          delayed = {}
          for field, value in self.data.items():
              model_field = getattr(type(self.instance), field, None)
  
              # If this is a many-to-many field, we cannot save it to the instance until the instance
              # is saved to the database. Collect these fields and delay the setting until after
              # the model instance is saved.
              if isinstance(model_field, ManyToManyField):
                  if value is not None:
                      delayed[field] = value
                  continue
  
              setattr(self.instance, field, value)
  
          rv = self.instance.save(force_insert=force_insert)
  
          for field, value in delayed.items():
              setattr(self.instance, field, value)
  
          return rv