即使在保存父对象时，也禁止“保存（），以防止由于未保存的相关对象而导致数据丢失”

Question

在将对象保存到数据库时遇到问题。我读过其他类似的文章，但仍然无法理解它为什么失败，因为我确实在保存状态之前保存了监视器对象

我错过了什么

monitor =  Monitors(
                        hostname=form['hostname'], 
                        type = form['type'],
                        interval = form['interval'],
                        ftt = form['ftt'],
                        alert_type = form['alert_type'],
                        alert_enabled = form['alert_enabled'],
                        params = params)
        try:
            monitor.save()
            state = States(monitor=monitor, state=2)
            state.save()
        except Exception as err:
            return render(request, 'error.html', {'error': err})

更新-新增型号：

class Monitors(models.Model):
    id = models.IntegerField(primary_key=True, unique=True, auto_created=True)
    hostname = models.CharField(max_length=100)
    type = models.CharField(max_length=100)
    interval = models.IntegerField()
    ftt = models.IntegerField()
    alert_type = models.CharField(max_length=100)
    alert_enabled = models.BooleanField()
    params = models.CharField(max_length=1000)

    class Meta:
        db_table = 'MONITORS'
        unique_together = ('hostname', 'type',)

    def __str__(self):
        return self.hostname

class States(models.Model):
    monitor = models.OneToOneField(Monitors, primary_key=True, on_delete=models.CASCADE, )
    state = models.IntegerField()

    class Meta:
        db_table = 'STATES'

    def __str__(self):
        return self.state

Answer 1

只需从Monitors模型中删除id字段。Django将自动创建此字段，您的问题将消失

https://docs.djangoproject.com/en/3.0/topics/db/models/#automatic-primary-key-fields

您需要一个AutoField，它不同于带有auto_create=True的整数字段。这是一个您可能不应该使用的高级功能

https://docs.djangoproject.com/en/2.1/howto/custom-model-fields/