Django Администратор показывает созданный экземпляр, но не видит его в представлении DRF - PullRequest
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Django Администратор показывает созданный экземпляр, но не видит его в представлении DRF

1 голос
/ 10 июля 2020

Я прохожу курс по DRF. По сути, это создание сайта вопросов и ответов. Теперь я попытался ответить на вопрос, используя интерфейс DRF. enter image description here

But when I look at the question, it still shows answer count as zero. enter image description here

But the answwers are visible on the Django Admin Panel. введите описание изображения здесь

Мой код для того же: файл models.py 

class Question(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    content = models.CharField(max_length=240)
    slug = models.SlugField(max_length=240, unique=True)
    author = models.ForeignKey(settings.AUTH_USER_MODEL,
                               on_delete=models.CASCADE,
                               related_name="questions")

    def __str__(self):
        return self.content


class Answer(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    body = models.TextField()
    question = models.ForeignKey(Question,
                                 on_delete=models.CASCADE,
                                 related_name="answers", null=True)
    author = models.ForeignKey(settings.AUTH_USER_MODEL,
                               on_delete=models.CASCADE)
    voters = models.ManyToManyField(settings.AUTH_USER_MODEL,
                                    related_name='votes')

    def __str__(self):
        return f'{self.body} by {self.author.username}'

Файл serializers.py: 

from rest_framework import serializers
from ..models import (Answer, Question)


class AnswerSerializer(serializers.ModelSerializer):
    author = serializers.StringRelatedField(read_only=True)
    created_at = serializers.SerializerMethodField(read_only=True)
    likes_count = serializers.SerializerMethodField(read_only=True)
    user_has_voted = serializers.SerializerMethodField(read_only=True)

    class Meta:
        model = Answer
        exclude = ['question', 'voters', 'updated_at']

    def get_created_at(self, instance):
        return instance.created_at.strftime("%B %d %y")

    def get_likes_count(self, instance):
        return instance.voters.count()

    def get_user_has_voted(self, instance):
        request = self.context.get('request')
        return instance.voters.filter(pk=request.user.pk).exists()


class QuestionSerializer(serializers.ModelSerializer):
    author = serializers.StringRelatedField(read_only=True)
    created_at = serializers.SerializerMethodField(read_only=True)
    slug = serializers.SlugField(read_only=True)
    answers_count = serializers.SerializerMethodField(read_only=True)
    user_has_answered = serializers.SerializerMethodField(read_only=True)

    class Meta:
        model = Question
        exclude = ['updated_at']

    def get_created_at(self, instance):
        return instance.created_at.strftime("%B %d %y")

    def get_answers_count(self, instance):
        return instance.answers.count()

    def get_user_has_answered(self, instance):
        request = self.context.get('request')
        return instance.answers.filter(author=request.user.pk).exists()

И файл views.py 

from rest_framework import generics, viewsets
from rest_framework.generics import get_object_or_404
from rest_framework.exceptions import ValidationError
from rest_framework.permissions import IsAuthenticated


from ..models import Question, Answer
from .serializers import QuestionSerializer, AnswerSerializer
from .permissions import IsAuthorOrReadOnly


class QuestionViewSet(viewsets.ModelViewSet):
    queryset = Question.objects.all()
    lookup_field = 'slug'
    serializer_class = QuestionSerializer
    permissions_class = [IsAuthorOrReadOnly, IsAuthenticated]

    def perform_create(self, serializer):
        serializer.save(author=self.request.user)


class AnswerCreateAPIView(generics.CreateAPIView):
    queryset = Answer.objects.all()
    serializer_class = AnswerSerializer
    permission_classes = [IsAuthenticated]

    def perform_create(self, serializer):
        request_user = self.request.user
        kwarg_slug = self.kwargs.get("slug")
        question = get_object_or_404(Question, slug=kwarg_slug)

        if question.answers.filter(author=request_user).exists():
            raise ValidationError('You Have Already Answered')
        serializer.save(author=self.request.user)

1 Ответ

0 голосов
/ 10 июля 2020

Вам необходимо указать question для создания ответа явно, если вы исключаете product в своем AnswerSerializer

class AnswerCreateAPIView(generics.CreateAPIView):
    ...
    def perform_create(self, serializer):
        ...
        serializer.save(author=self.request.user, <b>question=question</b>)
...