序列化模型数据导致 TypeError “ListSerializer 类型的对象不是 JSON 可序列化的”

Question

我无法将答案 here 或 here 用于我自己的问题。我尝试自定义DRF tutorial part 3：

models.py：

class ProductData(models.Model):
    product_id = models.CharField('device_id', max_length = 20)
    price = models.DecimalField('price')
    product = models.ForeignKey(Product, on_delete = models.CASCADE)
    

views.py：

class ProductViewSet(viewsets.ViewSet):

    def list(self, request):
        data = [{"products": Product.objects.all(),}]
        results = ProductSerializer(data = data, many = True)
        if results.is_valid():
            return Response(results)

serializers.py:

class ProductSerializer(serializers.ModelSerializer):
    product_id = serializers.CharField(max_length = 20)
    price = serializers.DecimalField(max_digits = 10)
    product = serializers.RelatedField(many=True)

    class Meta:
        model = ProductData
        fields = ["product_id", "price", "product",]   

我希望得到类似 JSON 的响应：

{ "product_id": "213123", "price": 2.99, "product":  "bacon" }

但我得到了错误：

Exception Type:     TypeError
Exception Value:    Object of type ListSerializer is not JSON serializable

Answer 1

你可以为此，我看到你了，你忘记了 results.data，因为你使用的是序列化程序，然后为了输出显示你必须调用 results.data

class ProductViewSet(viewsets.ViewSet):

    def list(self, request):
        results = ProductSerializer(Product.objects.all(), many = True)
        return Response(results.data)