Question

当我要在url中传递列表对象时，出现此错误

Got AttributeError when attempting to get a value for field `product` on serializer `ProductForParameterSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `int` instance.
Original exception text was: 'int' object has no attribute 'product'.

`

class ProductParameter(models.Model):
    product_attribute = models.ForeignKey(ProductAttribute, on_delete=models.CASCADE)
    product = models.ForeignKey(Product, on_delete=models.CASCADE, related_name='product_parameters')
    parameter = models.CharField(max_length=100, default='-')

和 serializers.py 看起来像这样

class ProductForParameterSerializer(serializers.ModelSerializer):
    name = serializers.CharField(source='product.name', max_length=255, read_only=True)
    product_desc = serializers.CharField(source='product.description', max_length=255, read_only=True)
    image = serializers.ImageField(source='product.image', read_only=True)
    price = serializers.DecimalField(source='product.price', max_digits=10, decimal_places=2, read_only=True)
    rating = serializers.CharField(source='product.rating', max_length=10, read_only=True)

    class Meta:
        model = ProductParameter
        fields = ('id', 'product', 'name', 'price', 'product_desc', 'image', 'rating')

您可以在模型中看到产品 ForeignKey。在此模型中，可能有多个产品，并且从此表中我应该获得ID唯一的产品。我不需要重复的产品。为此，我正在使用此视图

class ProductForParameterView(generics.ListAPIView):
    serializer_class = ProductForParameterSerializer

    def get_queryset(self):
        query_params = self.request.query_params
        products = query_params.get('product', None)

        productParams = []

        if products is not None:
            for product in products.split('|'):
                productParams.append(int(product))

        if products is not None:
            queryset = ProductParameter.objects.all()
            queryset = queryset.filter(product_id__in=productParams)
            qs = queryset.values_list('product', flat=True).distinct()
            return qs

但是我遇到错误。我怎样才能解决这个问题？预先感谢！

Answer 1

您将在查询集中返回queryset.values_list('product', flat=True).distinct()，该查询集中会提供产品ID的列表。这就是为什么您会收到此错误。您应该使用get_queryset方法返回产品列表。

class ProductForParameterView(generics.ListAPIView):
    serializer_class = ProductForParameterSerializer

    def get_queryset(self):
        query_params = self.request.query_params
        products = query_params.get('product', None)

        productParams = []

        if products is not None:
            for product in products.split('|'):
                productParams.append(int(product))

        if products is not None:
            queryset = ProductParameter.objects.all()
            queryset = queryset.filter(product_id__in=productParams)
            qs = queryset.values_list('product', flat=True).distinct()
            return Product.objects.filter(id__in=qs)

原始异常文本为：'int'对象没有属性'product'

1 个答案: