Serrar o questionário da Web Meduza: um guia passo a passo para iniciantes

from rest_framework import serializers
from .models import Answer, Question, Choice


class ChoiceSerializer(serializers.ModelSerializer):
    percent = serializers.SerializerMethodField()

    class Meta:
        model = Choice
        fields = ['pk', 'title', 'points', 'percent', 'lock_other', ]

    def get_percent(self, obj):
        total = Answer.objects.filter(question=obj.question).count()
        current = Answer.objects.filter(question=obj.question, choice=obj).count()
        if total != 0:
            return float(current * 100 / total)
        else:
            return float(0)


class QuestionSerializer(serializers.ModelSerializer):
    choices = ChoiceSerializer(many=True, source='choice_set', )

    class Meta:
        model = Question
        fields = ['pk', 'title', 'choices', 'max_points', ]


class AnswerSerializer(serializers.Serializer):
    answers = serializers.JSONField()

    def validate_answers(self, answers):
        if not answers:
            raise serializers.Validationerror("Answers must be not null.")
        return answers

    def save(self):
        answers = self.data['answers']
        user = self.context.user
        for question_id, in answers:  #     ,    
            question = Question.objects.get(pk=question_id)
            choices = answers[question_id]
            for choice_id in choices:
                choice = Choice.objects.get(pk=choice_id)
                Answer(user=user, question=question, choice=choice).save()
                user.is_answer = True
                user.save()

from .serializers import QuestionSerializer, AnswerSerializer
from rest_framework.permissions import IsAuthenticated
from rest_framework.generics import GenericAPIView
from rest_framework.response import Response
from .models import Question


class GetQuestion(GenericAPIView):
    permission_classes = (IsAuthenticated,)
    serializer_class = QuestionSerializer

    def get(self, request, format=None):
        questions = Question.objects.filter(visible=True, )
        last_point = QuestionSerializer(questions, many=True)
        return Response(last_point.data)


class QuestionAnswer(GenericAPIView):
    permission_classes = (IsAuthenticated,)
    serializer_class = AnswerSerializer

    def post(self, request, format=None):
        answer = AnswerSerializer(data=request.data, context=request)
        if answer.is_valid(raise_exception=True):
            answer.save()
            return Response({'result': 'OK'})

from django.contrib import admin
from .models import Question, Answer, Choice


class QuestionAdmin(admin.ModelAdmin):
    list_display = (
        'title',
        'visible',
        'max_points',
    )


class ChoiceAdmin(admin.ModelAdmin):
    list_display = (
        'title',
        'question',
        'points',
        'lock_other',
    )
    list_filter = ('question',)


class AnswerAdmin(admin.ModelAdmin):
    list_display = (
        'user',
        'question',
        'choice',
    )
    list_filter = ('user',)


admin.site.register(Question, QuestionAdmin)
admin.site.register(Choice, ChoiceAdmin)
admin.site.register(Answer, AnswerAdmin)