[英]AttributeError: '***' object has no attribute '***_set'
[英]AttributeError: '…' object has no attribute '_set'
我写了以下代码:
class Market(models.Model):
name = models.CharField(max_length=200)
class Fixture(models.Model):
home = models.ForeignKey(Team, on_delete=models.CASCADE, related_name="home")
away = models.ForeignKey(Team, on_delete=models.CASCADE, related_name="away")
league = models.ForeignKey(League, on_delete=models.CASCADE, blank=True)
round = models.CharField(max_length=200, default=None, blank=True, null=True)
updated_at = models.DateTimeField(auto_now=True)
created_at = models.DateTimeField(auto_now_add=True)
def __str__(self):
return u'{0} - {1}'.format(self.home.name, self.away.name)
class Prediction(models.Model):
market = models.ForeignKey(Market, on_delete=models.CASCADE, blank=True)
fixture = models.ForeignKey(to=Fixture, on_delete=models.CASCADE, related_name="fixture", null=True, blank=True)
我正在尝试使用以下代码将所有预测附加到一个夹具上:
f = Fixture.objects.get(sofascore_id="8645471").prediction_set
但这会产生以下错误:
AttributeError: 'Fixture' object has no attribute 'prediction_set'
我在这里做错了什么?
related_name=…
参数 [Django-doc]指定了反向关系的名称,因此从Fixture
到Prediction
。 _set , but since you set it to 'fixture'
, that of course does not work.如果您不设置它,它默认为 _set
,但由于您将其设置为'fixture'
,这当然不起作用。
例如,您可以将其定义为:
class Prediction(models.Model):
market = models.ForeignKey(Market, on_delete=models.CASCADE, blank=True)
fixture = models.ForeignKey(
to=Fixture,
on_delete=models.CASCADE,
related_name='predictions',
null=True,
blank=True
)
然后你可以查询:
f = Fixture.objects.get(sofascore_id='8645471').predictions.all()
但最好用以下方式查询:
f = Prediction.objects.filter(fixture__sofascore_id='8645471')
由于您使用了related_name="fixture"
,因此您需要使用它而不是 prediction_set。
下面的代码可以解决问题。
f = Fixture.objects.get(sofascore_id="8645471").fixture
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