django - 值更改后自动更新日期 [英] django - update date automatically after a value change

问题描述

在以下django模型中：

In the following django model:

class MyModel(models.Model):
    published = models.BooleanField(default=False)
    pub_date = models.DateTimeField('date published')

I希望使用当前日期自动更新pub_date字段，每当发布的字段更改为True时。

I want the pub_date field to be automatically updated with the current date, every time the published field changes to True.

什么是智能方式？

谢谢。

推荐答案

所有答案都很有用，但是我终于用这样做了：

All answers were useful, but I finally did it this way:

def save(self, *args, **kwargs):
    if self.published and self.pub_date is None:
        self.pub_date = timezone.now()
    elif not self.published and self.pub_date is not None:
        self.pub_date = None
    super(Model, self).save(*args, **kwargs)

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