Django one to many relationship for API call in restframework using serializers

Question

I have two models which are question and set of choices aligned with that question. I want to combine these two models to create an API which shows a list of question with their choices.

These are my models:

class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField("date published")

    def __str__(self):
        return self.question_text


class 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

These are my serializers

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',)

And this is the view class

@api_view(['GET', 'POST', ])
def getquestionWithChoices(request):
    question = Question.objects.all()
    serializer = QuestionWithAnswer
    return Response(serializer.data)

I have tried many things but could not get the below output.

  [
          {
            "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
              }
            ]
          },
          {
            "id": 2,
            "question_text": "What's your age?",
            "pub_date": "2019-04-13T05:27:39Z",
            "choices": [
              {
                "id": 4,
                "choice_text": "15",
                "votes": 4,
                "question": 2
              },
              {
                "id": 5,
                "choice_text": "16",
                "votes": 2,
                "question": 2
              },
              {
                "id": 6,
                "choice_text": "17",
                "votes": 2,
                "question": 2
              }
            ]
          }
        ]

Answer 1

You are not instantiating the serializator correctly.

@api_view(['GET', 'POST', ])
def getquestionWithChoices(request):
    questions = Question.objects.all()
    serializer = QuestionWithAnswer(questions, many=True)
    return Response(serializer.data)

and your serializers are not correctly defined also:

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

This is my view :

@api_view(['GET', 'POST', ])
def getquestionWithChoices(request):
    questions = Question.objects.all()
    serializer = QuestionWithAnswer(questions, many=True)
    return Response(serializer.data)

This is my serializer:

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')

Here is my model:

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

Anyone looking for same can use this.All remaining code is same as question.