django: how to pass condition to .is_valid() without populating all serializers parameters

Question

From the frontend, it was necessary to get the question object in order to understand what to return in the get function from the frontend, a request is sent to the post function With the id of the object to be returned.

With class TestQuestionList
in the post function I don’t need to create a new object, so I don’t fill in the fields, image, answers in the request, but django requires me to fill in these fields and returns – bad request 400
"POST /api/questions/ HTTP/1.1" 400 85

views.py:

class TestQuestionList(APIView):
    def __init__(self):
        self.questions = [1]
    def get(self, request):
        romms = TestQuestionBlok.objects.filter(id__in=self.questions)
        serializer = TestQuestionSerializers(romms, many=True)
        return Response(serializer.data)
    def post(self, request, format=None):
        serializer1 = TestQuestionSerializers(data=request.data)
        if serializer1.is_valid() :
            self.questions = serializer1.data['questions']
            return Response(serializer1.data, status=status.HTTP_200_OK)
        return Response(serializer1.errors, status=status.HTTP_400_BAD_REQUEST)

serializers.py:

class TestQuestionSerializers(serializers.ModelSerializer):

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

models.py:

class TestQuestionBlok(models.Model):
    image = models.ImageField(upload_to='questionsImages/')
    answers = models.ManyToManyField(TestAnswers)
    question = models.CharField(max_length=300)

    def __str__(self):
        return self.question

How can I bypass these requirements?

Asked By: Vahe Hakobjanyan

||

Source

Answer 1

Your API should look like this in order to get several objects:

class YourAPI(APIView):
    class InputSerializer(serializers.Serializer):
        ...

        objects = serializers.PrimaryKeyRelatedField(
            queryset=YourResourceModel.objects.all(),
            required=False,
            allow_empty=True,
            allow_null=True
        )

        ...
    class OutputSerializer(serializers.ModelSerializer):
        class Meta:
            model = TestQuestionBlok
            fields = ('__all__')
    
    def post(self, request):
        serialzier = self.InputSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        
        return Response(serializer.validated_data)

The serializers do not have to be part of your API it is just an example. However, it is a good practice according to some style guides.

Check out PrimaryKeyRelatedField

Essentially, your FE passes the PKs of the objects that you need as an array to the BE in a variable called objects, you can call it whatever you want.

Answered By: antpngl92

django: how to pass condition to .is_valid() without populating all serializers parameters

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