django rest framework - POST 请求导致 400 状态码

Question

我正在尝试执行 POST 创建文章的请求，但我收到此错误 Request failed with status code 400 Bad Request: /api/articles/create/。

一篇文章需要创建 3 个属性：
(1) 标题
(2) body
(3)作者(当前用户)

路由器工作正常，因为 POST 请求进入 ArticleCreateView class 的 post 方法。但我猜测 serializer.is_valid() 出于某种原因正在返回 False。还有print(request.data)returns{'title': 'hello', 'body': 'stuff'}

关于 Django 的另一个谜团是，序列化程序如何知道我是否想要获取、创建或更新某些内容？在我见过的所有示例中，序列化程序似乎神奇地知道这一点。

class ArticleCreateView(CreateAPIView):
    permission_classes = [IsAuthenticated]

    def post(self, request):
        serializer = ArticleSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors)


class ArticleSerializer(serializers.ModelSerializer):
    class Meta:
        model = Article
        fields = '__all__'

    def create(self, validated_data):
        author = self.context['request'].user
        title = validated_data.get('title')
        body = validated_data.get('body')
        return Article.objects.create(author=author, title=title, body=body)


class Article(models.Model):
    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    title = models.CharField(max_length=100)
    body = models.TextField(max_length=100)
    date_updated = models.DateTimeField(auto_now=True)
    date_created = models.DateTimeField(auto_now_add=True)

Answer 1

添加这个

serializer = ArticleSerializer(data=request.data, context={'request':request})

Answer 2

根据您的序列化程序，验证过程需要 author 详细信息，而不是通过 POST 有效负载。
因此，通过添加 required=False 或使用 ReadOnlyField() 或在 Meta class 中指定 read_only_fields。还要像 @nishant 提到的那样传递上下文数据

# views.py
class ArticleCreateView(CreateAPIView):
    permission_classes = [IsAuthenticated]

    def post(self, request):
        <b>serializer = ArticleSerializer(data=request.data, context={"request": request}) # change here </b>
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors)
# serializer.py
class ArticleSerializer(serializers.ModelSerializer):
    class Meta:
        model = Article
        fields = '__all__'
        <b>read_only_fields = ('author',)</b>

    def create(self, validated_data):
        author = self.context['request'].user
        title = validated_data.get('title')
        body = validated_data.get('body')
        return Article.objects.create(author=author, title=title, body=body)

django rest framework - POST 请求导致 400 状态码

django rest framework - POST request causes 400 status code

django

model-view-controller

serialization

django-serializer

django-rest-framework