del与delete()

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

我应该使用del self.__related_operation还是应该使用self.__related_operation.delete()？

Answer 1

del self.__related_operation将尝试删除实例的__related_operation属性。我不知道你为什么要这么做。

如果要从数据库中删除对象，请使用delete()方法。