django rest 框架 - POST 请求导致 400 状态码

Question

我正在尝试执行 POST 请求来创建文章，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) 身体
(3) 作者（当前用户）

路由器工作正常，因为 POST 请求进入 ArticleCreateView 类的 post 方法。但我猜serializer.is_valid() 出于某种原因返回False。 同样print(request.data) 返回{'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

根据您的序列化程序，验证过程需要 author 详细信息，它不会通过 POST 有效负载。
因此，通过添加 required=False 或使用 ReadOnlyField() 或指定 read_only_fields。还将上下文数据传递为提到的@nishant

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

    def post(self, request):
        serializer = ArticleSerializer(data=request.data, context={"request": request}) # change here 
        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__'
        read_only_fields = ('author',)

    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)

Answer 2

添加这个

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