序列化程序方法字段：超出错误最大递归深度

Question

我尝试做大厅预订应用程序。我已经设置了所有东西。模型和序列化器视图集和 url。现在我想从这个 API 返回 1. 所有大厅都有他们的预订表 2. 所有用户都用大厅名称预订

我尝试使用 SerializerMethodField 来获取所有这些数据，并且它在一边工作。例如，当我将 SerializerMethodField 放在预订表中时，我会像大厅表一样给我结果。但是当我尝试同时放入这两个类时，它会给出错误maximum recursion depth exceeded

模型类

class HallModel(models.Model):

    owner = models.ForeignKey(User, on_delete=models.CASCADE, related_name='hall_owner')
    name = models.CharField(max_length=100)
    price = models.FloatField()
    phone = models.CharField(max_length=9, blank=True)
    size = models.CharField(max_length=50)
    region = models.CharField(max_length=100)
    state = models.CharField(max_length=100)
    image_1 = models.ImageField(upload_to='halls_image')
    image_2 = models.ImageField(upload_to='halls_image')
    image_3 = models.ImageField(upload_to='halls_image')
    created_at = models.DateTimeField(auto_now_add=True)



class BookingModel(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user_booking')
    hall = models.ForeignKey(HallModel, on_delete=models.CASCADE, related_name='hall_owner')

    time_date = models.DateTimeField(auto_now_add=True)
    booking_method = models.IntegerField()

序列化器

class HallSerializer(serializers.ModelSerializer):
    booking = serializers.SerializerMethodField()

    class Meta:
        model = HallModel
        fields = '__all__'

    def get_booking(self, obj):
        booking = BookingSerializer(obj.hall_owner.all(),many=True).data
        return booking


    def perform_create(self, serializer):
        serializer.save()


class BookingSerializer(serializers.ModelSerializer):
    hall = serializers.SerializerMethodField()

    class Meta:
        model = BookingModel
        fields = '__all__'

    def get_hall(self, obj):
        serializer_data = HallSerializer(obj.hall).data
        return serializer_data

视图集

class HallViewSet(viewsets.ModelViewSet):
    queryset = HallModel.objects.all()
    serializer_class = HallSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly]

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user)



class BookingViewSet(viewsets.ModelViewSet):

    serializer_class = BookingSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly]

    def get_queryset(self):
        return self.request.user.user_booking.all()

当我删除一个 SerializerMethodField 时，在 Serializer 类中它可以工作。任何人都有解决方案

Answer 1

您可以在 Hall 序列化程序中设置一个预订 SerializerMethodField，因为每个预订都有一个 Hall 的外键，但反过来就不行（除了不必要之外）。这将导致无限递归，因为序列化程序会无限地相互引用。您也不需要在预订中使用 SerializerMethodField 来访问其大厅名称，因为它已经有一个指向其大厅的外键。