Question

Get方法可在可浏览的api端点中工作，但是当我尝试通过浏览器使用端点进行发布时，它会引发以下错误：（我的序列化器嵌套）

这是我的serializers.py，它是嵌套的Serilizers

from rest_framework import serializers
from . models import Author, Article, Category, Organization


class OrganizationSerializer(serializers.ModelSerializer):
    class Meta:
        model = Organization
        fields = '__all__'


class AuthorSerializer(serializers.ModelSerializer):
    organization = OrganizationSerializer()
    class Meta:
        model = Author
        fields = '__all__'


class CategorySerializer(serializers.ModelSerializer):
    class Meta:
        model = Category
        fields = '__all__'


class ArticleSerializer(serializers.ModelSerializer):
    author = AuthorSerializer()
    category = CategorySerializer()

    class Meta:
        model =  Article
        fields = '__all__'

这是我的models.py

from django.db import models
import uuid

class Organization(models.Model):
    organization_name = models.CharField(max_length=50)
    contact = models.CharField(max_length=12, unique=True)

    def __str__(self):
        return self.organization_name

class Author(models.Model):
    name = models.CharField(max_length=40)
    detail = models.TextField()
    organization = models.ForeignKey(Organization, on_delete=models.DO_NOTHING)

    def __str__(self):
        return self.name

class Category(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name

class Article(models.Model):
    alias = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    author = models.ForeignKey(Author, on_delete=models.CASCADE, related_name='author')
    title = models.CharField(max_length=200)
    body = models.TextField()
    category = models.ForeignKey(Category, on_delete=models.CASCADE)

这是我的views.py（我使用的是APIView，而不是VIewset）

class ArticleDeleteUpdate(DestroyAPIView, UpdateAPIView):
    queryset = Article.objects.all()
    serializer_class = ArticleSerializer
    lookup_field = 'alias'

这是我的urls.py

path('api/v1/article', views.ArticleListCreateGet.as_view(), name='article2'),

我花了10个小时来解决此问题，但未能解决...

我没有发现这是什么问题...这个错误毁了我的睡眠。

有人可以帮助我解决此问题吗？

Answer 1

使用正确的方法进行编辑：抱歉，我刚刚意识到您使用的是ModelSerializers而不是Serializers。您需要从

更改

class ArticleSerializer(serializers.ModelSerializer):
    author = AuthorSerializer()
    category = CategorySerializer()

    class Meta:
        model =  Article
        fields = '__all__'

到

class ArticleSerializer(serializers.ModelSerializer):
    author = serializers.PrimaryKeyRelatedField()
    category = serializers.PrimaryKeyRelatedField()

    class Meta:
        model =  Article
        fields = '__all__'

并检查PrimaryKeyRelatedField的文档，因为它包含一些可能对API设计很有趣的选项

https://www.django-rest-framework.org/api-guide/relations/#primarykeyrelatedfield

您很有可能需要使用read_only=True选项，因此您无需覆盖任何方法

原始答案并附带一些解释：之所以会出现错误，是因为POST试图创建嵌套对象，但是您的序列化程序没有覆盖.create()方法，因此序列化程序不知道如何处理嵌套关系。

在https://www.django-rest-framework.org/api-guide/serializers/#writing-create-methods-for-nested-representations上查看一下，您可以了解所需的内容。

嵌套序列化的DRF端点发布错误

1 个答案: