使用序列化程序在restframework中进行API调用的Django一对多关系

Question

我有两个模型，它们是问题和与该问题一致的一组选择。我想结合这两个模型来创建一个 API，显示一个问题列表和他们的选择。这些是我的模型：class Question(models.Model):    question_text = models.CharField(max_length=200)    pub_date = models.DateTimeField("date published")    def __str__(self):        return self.question_textclass Choice(models.Model):    choice_text = models.CharField(max_length=200)    votes = models.IntegerField(default=0)    question = models.ForeignKey(Question, on_delete=models.CASCADE)    def __str__(self):        return self.choice_text这些是我的序列化程序class QuestionSerializer(serializers.ModelSerializer):    class Meta:        model = Question        fields = ('question_text',)class ChoiceSerializer(serializers.ModelSerializer):    class Meta:        model = Choice        fields = ('choice_text','question',)class QuestionWithAnswer(serializers.ModelSerializer):    question = QuestionSerializer(many=True)    class Meta:        model = Choice        fields = ('question',)这是视图类@api_view(['GET', 'POST', ])def getquestionWithChoices(request):    question = Question.objects.all()    serializer = QuestionWithAnswer    return Response(serializer.data)我尝试了很多东西，但无法获得以下输出。  [          {            "id": 1,            "question_text": "What's your name?",            "pub_date": "2019-04-13T05:27:21Z",            "choices": [              {                "id": 1,                "choice_text": "fred",                "votes": 0,                "question": 1              },              {                "id": 2,                "choice_text": "bob",                "votes": 0,                "question": 1              },              {                "id": 3,                "choice_text": "rachel",                "votes": 0,                "question": 1              }            ]          },         

Answer 1

您没有正确实例化序列化器。

@api_view(['GET', 'POST', ])

def getquestionWithChoices(request):

    questions = Question.objects.all()

    serializer = QuestionWithAnswer(questions, many=True)

    return Response(serializer.data)

并且您的序列化程序也未正确定义：

class ChoiceSerializer(serializers.ModelSerializer):

    class Meta:

        model = Choice

        fields = ('id', 'votes', 'choice_text','question',)

class QuestionWithAnswer(serializers.ModelSerializer):

    choices = ChoiceSerializer(many=True)

    class Meta:

        model = Question

        fields = ('id', 'question_text', 'pub_date', 'choices')

Answer 2

这是我的观点：

@api_view(['GET', 'POST', ])

def getquestionWithChoices(request):

    questions = Question.objects.all()

    serializer = QuestionWithAnswer(questions, many=True)

    return Response(serializer.data)

这是我的序列化器：

class ChoiceSerializer(serializers.ModelSerializer):

    class Meta:

        model = Choice

        fields = ('id', 'votes', 'choice_text',)

class QuestionWithAnswer(serializers.ModelSerializer):

    question = ChoiceSerializer(many=True)

    class Meta:

        model = Question

        fields = ('id', 'question_text', 'pub_date','question')

这是我的模型：

class Choice(models.Model):

    choice_text = models.CharField(max_length=200)

    votes = models.IntegerField(default=0)

    question = models.ForeignKey(Question,  related_name='question', on_delete=models.CASCADE)

    def __str__(self):

        return self.choice_text

任何寻找相同的人都可以使用这个。所有剩余的代码都与问题相同。