Question

我有EndPoint，可让用户预订大厅。但是，当我尝试预订大厅时，会出现错误 NOT NULL constraint failed 。我锁定问题'NOT NULL constraint failed' after adding to models.py。他们建议在字段中添加null。但就我而言，我必须保存大厅ID，否则我不知道用户正在预订的大厅（它在大厅中保存为空）

在开始时显示此错误：NOT NULL constraint failed: api_bookingmodel.user_id，我通过添加函数perform_create ... serializer.save(user=self.request.user)

来解决它

这是我的代码。...

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__'
        depth = 1

    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()

它显示此错误：IntegrityError at /api/booking/ NOT NULL constraint failed: api_bookingmodel.hall_id ...我想我必须将Hall ID保存在perform_create函数中，但我无法执行。 最奇怪的是，当我在预订序列化程序中删除depth = 1时，并没有显示错误提示 ...任何人都有解决方法。

Answer 1

您可以在BookingViewSet类中覆盖TOOLCHAIN_TARGET_TASK_append = " <package>-staticdev <package>-dev"，如下所示：

def perform_create

确保在发布请求中准备好hall_id。 HallSerializer中的def perform_create(self, serializer): serializer.save( user=self.request.user, hall=self.request.data['hall_id'] )也没有用。阅读cdrf.co

perform_create保存用户数据

1 个答案: