创建重载的问题

Posted 2020-10-23 yuanoung

正确的写法：

class CategoriesView(generics.ListCreateAPIView):
    queryset = Category.objects.all()
    serializer_class = CategorySerializers
    permission_classes = (IsAuthenticated,)

    def create(self, request, *args, **kwargs):
        if self.queryset.filter(category=request.data.get("category").upper()).exists():
            return Response(status=status.HTTP_201_CREATED)
        return super(CategoriesView, self).create(request, *args, **kwargs)

下面的这种写法：

class CategoriesView(generics.ListCreateAPIView):
    queryset = Category.objects.all()
    serializer_class = CategorySerializers
    permission_classes = (IsAuthenticated,)

    def post(self, request, *args, **kwargs):
        if self.queryset.filter(category=request.data.get("category").upper()).exists():
            return Response(status=status.HTTP_201_CREATED)
        return super(CategoriesView, self).create(request, *args, **kwargs)

会出现serializer = self.get_serializer(data=request.data)报错，提示说request不存在data属性。request参数在post中时正常的，但是在调用super(CategoriesView, self).create(request, *args, **kwargs)时，request参数的外面，django再次包裹了一次request，所以导致data属性不存在。