Question

我试图更新客户端数据库中的现有行我使用put方法向服务器发送请求我使用了updatemodelmixin也是id通过此视图服务器响应来到服务器数据

maximum recursion depth exceeded

更新数据的正确方法是什么？

class ProductOwnserSingleViewAPIView(APIView,mixins.UpdateModelMixin):

    queryset = Product.objects.all()
    serializer_class = ProductSerializer

    def put(self, request, *args, **kwargs):
        return  self.put(self,request,*kwargs,**kwargs)

    def get(self, request):
        id = request.GET.get("id")
        try:
            product = Product.objects.get(
                author_id=request.user.id,
                product_id=id
            )
            if not product:
                return Response(status.HTTP_400_BAD_REQUEST)
            serializer = ProductSerializer(instance=product, context={"request": request})
            return Response(serializer.data)
        except Product.DoesNotExist:
            return Response(status.HTTP_400_BAD_REQUEST)

Answer 1

你写道：

class ProductOwnserSingleViewAPIView(APIView,mixins.UpdateModelMixin):

    # ...

    def put(self, request, *args, **kwargs):
        return  self.put(self,request,*kwargs,**kwargs)

如果您执行PUT请求，则表示使用某些参数调用put(..)函数。但是你的put函数做了什么？实际上，它使用相同的参数调用本身。此调用随后导致另一个调用，因此您将一直调用，直到调用堆栈达到其最大值，并发生错误。

put(..)的典型工作流程是：

class ProductOwnserSingleViewAPIView(APIView,mixins.UpdateModelMixin):

    # ...

    def put(self, request, pk, format=None):
        # obtain the element we want to "update"
        product = Product.objects.get(
            author_id=request.user.id,
            product_id=request.GET('id')
        )

        # pass the element through the serializer with the data to update
        serializer = ProductSerializer(product, data=request.data)
        # check if the update makes sense (is valid)
        if serializer.is_valid():
            # if so, we save the object
            serializer.save()
            # and return the data as a response
            return Response(serializer.data)
        # if not, we report the errors as a response
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

所以我们首先获得我们希望PUT的元素，然后我们调用序列化器来更新我们想要更改的字段（数据在request.data中），最后是所有这些字段有效我们保存对象并返回对象的所有数据。

如果序列化程序报告错误，我们会返回这些错误。

Answer 2

def put(self, request, *args, **kwargs):
    return  self.put(self,request,*kwargs,**kwargs)

改变它;

def put(self, request, *args, **kwargs):
    return  super(ProductOwnserSingleViewAPIView, self).update(request, *args, **kwargs)

DRF更新一行

2 个答案: