DRF return create() 方法中的序列化对象

Question

我正在为我的模型编写自定义创建方法：

class TripReportViewSet(viewsets.ModelViewSet):
    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
    serializer_class = TripReportSerializer
    pagination_class = TripReportSetPagination
    # To order by favorite count or 'top':
    queryset = TripReport.objects.all().annotate(count=Count('favoriters')).order_by('-count')
    #queryset = TripReport.objects.all().order_by('-pk')
    filter_backends = (filters.SearchFilter, filters.OrderingFilter)
    search_fields = ('=author__username', '=slug', 'countries__name', )
    ordering_fields = ('pk', )

    def create(self, request, **kwargs):
        countries = request.POST['countries'].split(',')
        countries = list(map(int, countries))
        countries = Country.objects.filter(pk__in=countries)

        instance = TripReport.objects.create(
            author=User.objects.get(pk=request.POST['author']),
            title=request.POST['title'],
            content=request.POST['content'],
        )
        instance.countries.set(countries)
        instance.save()
        return HttpResponse(TripReportSerializer(instance))

我似乎无法得到正确的回应。我想 return 我的序列化对象，但是

HttpResponse(instance)

和

HttpResponse(TripReportSerializer(instance))

给我错误的结果。 TripReportSerializer 是我用于查看的那个。

Answer 1

我发现代码有两处错误：

到return序列化器数据我认为你应该使用TripReportSerializer(instance).data
Rest Framework 视图通常return一个Response对象，它是从rest_framework.response.Response

您应该做的另一项修改是使用视图 get_serializer() 方法，这样序列化器将填充上下文（视图、格式和请求），在您的情况下，这意味着在创建方法结束。

serializer = self.get_serializer(instance)
return Response(serializer.data)

Answer 2

你要做的是，serialize the newly created Trip instance and return by using DRF's Responseclass

<b>from rest_framework.response import Response</b>


class TripReportViewSet(viewsets.ModelViewSet):
    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
    serializer_class = TripReportSerializer
    pagination_class = TripReportSetPagination
    # To order by favorite count or 'top':
    queryset = TripReport.objects.all().annotate(count=Count('favoriters')).order_by('-count')
    # queryset = TripReport.objects.all().order_by('-pk')
    filter_backends = (filters.SearchFilter, filters.OrderingFilter)
    search_fields = ('=author__username', '=slug', 'countries__name',)
    ordering_fields = ('pk',)

    def create(self, request, **kwargs):
        countries = request.POST['countries'].split(',')
        countries = list(map(int, countries))
        countries = Country.objects.filter(pk__in=countries)

        instance = TripReport.objects.create(
            author=User.objects.get(pk=request.POST['author']),
            title=request.POST['title'],
            content=request.POST['content'],
        )
        instance.countries.set(countries)
        instance.save()
        <b># changes
        serializer = TripReportSerializer(instance)
        return Response(serializer.data)</b>

DRF return create() 方法中的序列化对象

DRF return serialized object in create() method

python

django-serializer

django-rest-framework