Question

class myClass (models.Model):
  related_operation = models.ForeignKey('self', null = True)

  __related_operation = None

  def save(self, force_insert=False, force_update=False):
    if self.related_operation != self.__related_operation:
      del self.__related_operation

    super(Operation, self).save(force_insert, force_update)
    self.__related_operation = self.related_operation

should I use del self.__related_operation or should I use self.__related_operation.delete()?

Answer 1

del self.__related_operation will attempt to delete the instance’s __related_operation attribute. I’m not sure why you would want to do this.

If you want to remove the object from the database, use the delete() method.