正确更新 Django 模型的外键属性

Question

我有一个Django模型命名为EmailSendingTask。这是整个模型-

class EmailSendingTask(models.Model):
order = models.OneToOneField(Order, on_delete=models.CASCADE, related_name='order')
status = EnumChoiceField(SetupStatus, default=SetupStatus.active)
time_interval = EnumChoiceField(TimeInterval, default=TimeInterval.five_mins)
immediate_email = models.OneToOneField(PeriodicTask, on_delete=models.CASCADE, null=True, blank=True, related_name='immediate_email')
scheduled_email = models.OneToOneField(PeriodicTask, on_delete=models.CASCADE, null=True, blank=True, related_name='scheduled_email')
created_at = models.DateTimeField(auto_now_add=True)


class Meta:
verbose_name = 'EmailSendingTask'
verbose_name_plural = 'EmailSendingTasks'


def __str__(self) -> str:
return f'EmailSendingTask: Order = {self.order}'

immediate_email和scheduled_email字段负责保存两个PeriodicTask对象。

我创建了一个名为disable_scheduled_email的函数，它负责禁用scheduled_email的周期性任务。函数的详细信息在这里-

def disable_scheduled_email(self):
print(f'Disabling scheduled email...')
self.scheduled_email.enabled = False
self.save(update_fields=['scheduled_email'])

现在，每当我调用这个函数并打印self.scheduled_email.enabled的值时，我发现它是False。但是，当我试图查看Django Admin站点时，周期性任务的enabled值仍然是True。为什么会发生这种情况?

Answer 1

经过一些实验进入Django Shell我发现，我没有专门调用save()到外键(scheduled_email)。我刚刚将self.scheduled_email.save()添加到disable_scheduled_email函数中。因此，整个函数变成了:

def disable_scheduled_email(self):
print(f'Disabling scheduled email...')
self.scheduled_email.enabled = False
# self.save(update_fields=['scheduled_email'])
self.scheduled_email.save() #instead of self.save(...), wrote this