用Django-HVAD TranslatedFields序列化外键对象

Question

我看到在Django上已经有关于序列化的several questions了，但是我有更多的复杂性，因为我的字段是被翻译的(使用django-hvad)。

我有一些工作，但我想这是可怕的低效，而且由于我刚到Django，我想是否有更好的方法。

我现在要做的是获取我需要的三种模型中的每一种(Survey、SurveyQuestion、SurveyAnswer)，分别序列化每个模型，然后在转换为JSON之前将它们组合在一起。

这一效果正在发挥作用，如django外壳所示：

>>> qs = models.SurveyQuestion.objects.language('en').all().filter(survey=1)
>>> for q in qs:
...   res.append({'question': q, 'answers' : models.SurveyAnswer.objects.language('en').all().filter(question=q.pk)})
...
>>> res = []
>>> res
[{'question': <SurveyQuestion: Who is the best Beatle?>, 'answers': [<SurveyAnswer: Paul McCartney>, <SurveyAnswer: George Harrison>, <SurveyAnswer: Ringo Starr>]}, {'question': <SurveyQuestion: Which album from The Beatles was the best?>, 'answers': [<SurveyAnswer: Yellow Submarine>, <SurveyAnswer: Revolver>, <SurveyAnswer: The White Album>]}]

这是相关代码。如果你需要看更多的话，请告诉我：

views.py

class SurveyDetail(APIView):
    """
    Retrieve, update or delete a survey instance.
    """
    def get_object(self, pk):
        try:
            user_language = self.request.GET.get('language')
            return models.Survey.objects.language(user_language).get(pk=pk)
        except models.Survey.DoesNotExist:
            return HttpResponse(status=status.HTTP_404_NOT_FOUND)

    def get_related_questions(self, pk):
        try:
            user_language = self.request.GET.get('language')
            return models.SurveyQuestion.objects.language(user_language).all().filter(survey=pk)
        except models.SurveyAnswer.DoesNotExist:
            return HttpResponse(status=status.HTTP_404_NOT_FOUND)

    def get_related_answers(self, pk):
        try:
            user_language = self.request.GET.get('language')
            return models.SurveyAnswer.objects.language(user_language).all().filter(question=pk)
        except models.SurveyAnswer.DoesNotExist:
            return HttpResponse(status=status.HTTP_404_NOT_FOUND)

    def get(self, request, pk, format=None):
        survey = self.get_object(pk)
        questions = self.get_related_questions(pk)
        res = []
        for q in questions:
            res.append({
                'question': SurveyQuestionSerializer(q).data,
                'answers' : SurveyAnswerSerializer(self.get_related_answers(q.pk), many=True).data
                })
        resp_obj = {
            'survey' : SurveySerializer(survey).data,
            'data' : res
            }

        return JSONResponse(resp_obj)

    def put(self, request, pk, format=None):
        survey = self.get_object(pk)
        serializer = SurveySerializer(survey, data=data)
        if serializer.is_valid():
            serializer.save()
            return JSONResponse(serializer.data)
        return JSONResponse(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def delete(self, request, pk, format=None):
        survey = self.get_object(pk)
        survey.delete()
        return HttpResponse(status=status.HTTP_204_NO_CONTENT)

serializers.py

class SurveySerializer(TranslatableModelSerializer):
    class Meta:
        model = models.Survey
        fields = ['pk', 'title', 'description', 'slug']


class SurveyQuestionSerializer(TranslatableModelSerializer):
    # survey = SurveySerializer(required=False)
    class Meta:
        model = models.SurveyQuestion
        fields = ['pk', 'title', 'content', 'slug', 'survey', 'is_multi_select', 'has_other_field', 'required']


class SurveyAnswerSerializer(TranslatableModelSerializer):
    # question = SurveyQuestionSerializer(required=False)
    class Meta:
        model = models.SurveyAnswer
        fields = ['pk', 'title', 'slug', 'question']

Answer 1

我自己想出来的。显然，它和未经翻译的模型没有什么不同，我只是以前没有得到过。

下面是正确工作的代码。请注意每个序列化器的顺序，以及包含反向外键字段作为序列化器。

serializers.py

class SurveyAnswerSerializer(TranslatableModelSerializer):
    class Meta:
        model = models.SurveyAnswer
        fields = ['pk', 'title', 'slug', 'question']

class SurveyQuestionSerializer(TranslatableModelSerializer):
    answers = SurveyAnswerSerializer(many=True)

    class Meta:
        model = models.SurveyQuestion
        fields = ['pk', 'title', 'content', 'slug', 'survey', 'is_multi_select', 'type', 'scale_min','scale_max', 'has_other_field', 'required', 'answers']

class SurveySerializer(TranslatableModelSerializer):
    questions = SurveyQuestionSerializer(many=True)

    class Meta:
        model = models.Survey
        fields = ['pk', 'title', 'description', 'slug', 'questions']

views.py

class SurveyDetail(APIView):
    ...
    def get(self, request, pk, format=None):
        survey = self.get_object(pk)
        serializer = SurveySerializer(survey)
        return JSONResponse(serializer.data)

编辑：

结果证明这不完全有效。在这个场景中，Survey对象被正确地翻译，但是由外键引用的对象，比如SurveyQuestion和SurveyAnswer，没有被翻译。这意味着您将得到翻译的和未翻译的结果的混合。