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python - Django（1.11）在嵌套序列化程序中发布user.id

问题描述

当用户在模型中创建送货地址和产品数据时，我想在后台获取 user.id 并且我收到此错误
ull value in column "ordered_by_id" violates not-null constraint DETAIL: Failing row contains (66, 5051, tetsst, 2018-10-11, f, null).
，这意味着由于某种原因未将 user.id 添加到模型中。

我的模型.py 

class Product(models.Model):
    price = models.FloatField()
    name = models.CharField(default='gift', max_length=512)
    ordered_by = models.ForeignKey(User, null=False)
    date = models.DateField(auto_now_add=True)
    purchased = models.BooleanField(default=False)

    def __str__(self):
        return self.name


class Delivery(models.Model):
    address = models.CharField(max_length=256)
    city = models.CharField(max_length=128)
    country = models.CharField(max_length=128)
    zip_code = models.IntegerField()  #gotta change that one to charfield
    phone_regex = RegexValidator(regex=r'^\+?1?\d{9,15}$',
                                 message="Phone number must be entered in the format: '+999999999'."
                                         " Up to 15 digits allowed.")
    phone_number = models.CharField(validators=[phone_regex], max_length=16, blank=False)
    delivered = models.BooleanField(default=False)
    product = models.ForeignKey(Product)

我的序列化程序.py 

class ProductSerializer(serializers.ModelSerializer):
    class Meta:
        model = Product
        fields = (
            "name",
            "price",
        )

class ProductDeliverySerializer(serializers.ModelSerializer):
    product = ProductSerializer()

    class Meta:
        model = Delivery
        fields = (
            "address",
            "city",
            "country",
            "zip_code",
            "phone_number",
            "product",
        )

    def create(self, validated_data):
        product_data = validated_data.pop('product')
        print(validated_data, product_data)
        product = Product.objects.create(**product_data)
        delivery = Delivery.objects.create(product=product, **validated_data)
        return delivery

当我打印/测试验证数据时，它实际上显示“表单”/POST 是 {'address': 'address here', 'city': 'City is here', 'country': 'Country is here', 'zip_code': 3333, 'phone_number': '+19991234567', 'ordered_by': <SimpleLazyObject: <User: testuser>>}
product_data 的完整输出 OrderedDict([('name', 'tetsst'), ('price', 5051.0)])

我的意见.py 

class ProductList(generics.ListCreateAPIView):
    queryset = Product.objects.all()
    serializer_class = ProductSerializer

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


class DeliveryList(generics.ListCreateAPIView):
    queryset = Delivery.objects.all()
    serializer_class = ProductDeliverySerializer

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

标签： pythondjangodjango-rest-framework

解决方案

问题出在product = Product.objects.create(**product_data). product_data 不包含任何用户对象。它不见了。这可能是您如何构造输入 JSON 的问题。将ordered_by经过验证的数据添加到 product_data。像这样的东西：

product_data['ordered_by'] = validated_data.pop('ordered_by')

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