我在DRF中使用带有直通模型的m2m字段。一切都运行正常,除了我尝试嵌套会员序列化器。
models.py
class SweepStakes(models.Model):
name = models.CharField(max_length=255)
class Event(models.Model):
sweepstakes = models.ManyToManyField(SweepStakes, through='EventSweepStakesMembership')
class EventSweepStakesMembership(models.Model):
event = models.ForeignKey(Event, on_delete=models.CASCADE)
sweepstakes = models.ForeignKey(SweepStakes, on_delete=models.CASCADE)
enabled = models.BooleanField(default=False)
serializers.py
class EventSweepStakesSerializer(serializers.ModelSerializer):
name = serializers.ReadOnlyField(source='sweepstakes.name')
class Meta:
model = EventSweepStakesMembership
fields = ('name', 'enabled',)
class EventSerializer(BaseTenantSerializer):
sweepstakes = EventSweepStakesSerializer(many=True, read_only=True)
class Meta:
model = Event
fields = ('sweepstakes',)
此时,如果我将EventSweepStakesMembership
模型和EventSweepStakesSerializer
挂钩到视图中,我会得到我期望的结果,输出如下:
{"name": "thingy", "enabled" true}
但是,当我将Event
模型和EventSerializer
序列化程序挂钩到视图中时,sweepstakes
字段将返回一个空字典而不是嵌套表示,如下所示:
{"sweepstakes": [{}]}
请注意,它不是一个空数组,换句话说,它确实会看到相关的直通模型,但在显示时却没有正确地序列化它。
没有错误,它只是空的。我试过增加depth
序列化程序的Event
无效。
我是否遗漏了某些东西,或者甚至可能都错了?
谢谢!
答案 0 :(得分:2)
知道了,感谢这个答案:
https://stackoverflow.com/a/17263583/1366989
此处缺少的元素是source
上的EventSerializer
kwarg。所以,它现在看起来像这样,并按预期工作:
class EventSerializer(BaseTenantSerializer):
sweepstakes = EventSweepStakesSerializer(
source='eventsweepstakesmembership_set', many=True, read_only=True
)