Django REST 框架 - 反向外键关系

Question

我围绕调查的前提构建了以下三个模型。

class Survey(models.Model):
   ...
   id = models.UUIDField(_('Id'), primary_key=True, default=uuid.uuid4, editable=False,)
   name = models.CharField(_('Name'), max_length=120, blank=True, unique=True)
   slug = models.SlugField(_('Slug'), max_length=120, blank=True, unique=True)
   description = models.TextField(_('Description'), blank=True)
   ...

每个调查可以有多个问题SurveyQuestion:

class SurveyQuestion(models.Model):
    ...
    survey = models.ForeignKey('surveys.Survey', on_delete=models.CASCADE, null=True, blank=True,)

并且每个 SurveyQuestion 可以有多个答案 SurveyQuestionAnswer:

class SurveyQuestionAnswer(models.Model):
    ...
    survey_question = models.ForeignKey('surveys.SurveyQuestion', on_delete=models.CASCADE, null=True, blank=True,)

为简洁起见，请将我的 Survey 序列化程序想象得尽可能简单：

class SurveySerialializer(serializers.ModelSerializer):

    class Meta:
        model = Survey
        fields = ('__all__')

实际上，我有以下内容：

class Survey(APIView):
    """
        Survey GET request endpoint: fetches Survey
    """
    permission_classes = User

    def get(self, request, survey_slug):

        survey = Survey.objects.get(slug=survey_slug)

        serializer = SurveySerializer(survey)

        response = get_hug_response(message='Organisation Active Survey Fetched Successfully', data=serializer.data)
        return Response(data=response, status=status.HTTP_200_OK)

但是，正如你们可能都知道的那样，相应的 surveys.get('slug') 仅获取 returns Survey 模型中的字段。理想情况下，我想对每个 SurveyQuestion 进行某种提取，并在其中嵌套 SurveyQuestionAnswers

如有任何专业提示和指点，我们将不胜感激。

我已经尝试了一些东西，但只会抛出错误。我很难知道这种类型的 API 关系在 DRF 中被称为什么，所以我找不到合适的示例指南来基于来自...

的相同原则

相关版本：

Django==2.2.1
djangorestframework==3.9.3

Answer 1

创建两个序列化程序，SurveyQuestionAnswerSerializer 和 SurveyQuestionSerializer

<b>class SurveyQuestionAnswerSerializer(serializers.ModelSerializer):
    class Meta:
        model = SurveyQuestionAnswer
        fields = '__all__'


class SurveyQuestionSerializer(serializers.ModelSerializer):
    survey_questionanswers = SurveyQuestionAnswerSerializer(many=True, read_only=True, source="surveyquestionanswer_set")

    class Meta:
        model = SurveyQuestion
        fields = '__all__'</b>


class SurveySerializer(serializers.ModelSerializer):
    <b>survey_questions = SurveyQuestionSerializer(many=True, read_only=True, source="surveyquestion_set")</b>

    class Meta:
        model = Survey
        fields = '__all__'

欲了解更多信息，
1. What is related_name used for in Django?
2. DRF Serializer's source argument

Django REST 框架 - 反向外键关系

Django REST framework - reverse ForeignKey relations

django

django-rest-framework

django-2.2