Django REST框架-反向外键关系
我围绕调查的前提构建了以下三个模型Django REST框架-反向外键关系,django,django-rest-framework,django-2.2,Django,Django Rest Framework,Django 2.2,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(_(
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,)
每个调查问题可以有多个答案调查问题答案:
class SurveyQuestionAnswer(models.Model):
...
survey_question = models.ForeignKey('surveys.SurveyQuestion', on_delete=models.CASCADE, null=True, blank=True,)
为简洁起见,请将我的调查序列化程序想象为尽可能简单:
class SurveySerialializer(serializers.ModelSerializer):
class Meta:
model = Survey
fields = ('__all__')
实际上,我所拥有的是:
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,您可能都知道,相应的surveys.get('slug')
fetch只返回Survey
模型中的字段。理想情况下,我希望对每个SurveyQuestion
进行某种提取,并在其中嵌套surveyquestionsweals
任何专业的提示和建议都将不胜感激
我试过一些只会出错的方法。我很难知道这种类型的API关系在DRF中被调用,所以我找不到合适的示例指南来根据相同的原则
相关版本:
Django==2.2.1
djangorestframework==3.9.3
创建两个序列化程序,SurveyQuestionAnswerSerializer
和SurveyQuestionSerializer
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__'
class SurveySerializer(serializers.ModelSerializer):
survey_questions = SurveyQuestionSerializer(many=True, read_only=True, source="surveyquestion_set")
class Meta:
model = Survey
fields = '__all__'
class SurveyQuestionAnswerSerializer(serializers.ModelSerializer):
类元:
模型=调查问题答案
字段='\uuuu所有\uuuu'
类SurveyQuestionSerializer(serializers.ModelSerializer):
survey\u questionanswers=SurveyQuestionAnswerSerializer(many=True,read\u only=True,source=“surveyquestionanswer\u set”)
类元:
模型=调查问题
字段='\uuuu所有\uuuu'
类SurveySerializer(serializers.ModelSerializer):
survey\u questions=SurveyQuestionSerializer(many=True,read\u only=True,source=“surveyquestion\u set”)
类元:
模型=调查
字段='\uuuu all\uuuu'
有关更多信息,
1.
2. 太棒了,第一次工作。当你知道怎么做的时候就容易了!你能解释一下源
集合在做什么吗?…我已经更新了一些相关链接,希望它能传达这样的想法:)嗯,源
参数的链接没有指定\u集合
的含义。我可以假设集合属于父模型实例吗?第一个引用传递了集合是什么