如何在 django rest 框架 (DRF) 中创建有助于 OneToOne 关系的两个模型的新实例？

Question

我创建了一个Author model，其中它与默认 Django 用户具有OneToOne关系，如下所示：

from django.contrib.auth.models import User
from django.db import models


class Author(models.Model):
    user = models.OneToOneField(
        User,
        related_name='author',
        on_delete=models.CASCADE,
        default="",
    )

    is_author = models.BooleanField(
        default=True
    )

在这里，我创建了以下视图集：

class AuthorViewSet(viewsets.ModelViewSet):
    serializer_class = AuthorSerializer
    queryset = Author.objects.all()

    def get_permissions(self):
        if self.action == "list" or self.action == "retrieve" or self.action == "update":
            self.permission_classes = [IsCurrentOwner, permissions.IsAdminUser]

        elif self.action == "create":
            self.permission_classes = [permissions.AllowAny]

        return super(AuthorViewSet, self).get_permissions()

问题有什么方法可以一步创建user和author （请求）？ 如何？

序列化代码：

class AuthorSerializer(serializers.ModelSerializer):

    class Meta:
        model = Author
        fields = "__all__"

        extra_kwargs = {
            'password': {'write_only': True},
            'id': {'read_only': True}
        }

我已经尝试了以下请求，但它不起作用。

#url: localhost:8000/users/
#method: POST

{
    "user": {
        "username": "mostafa",
        "password": "1"
    }       
}

错误：

{
    "user": [
        "Incorrect type. Expected pk value, received dict."
    ]
}

Answer 1

为此，您需要为用户创建另一个序列化程序：

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = "__all__"

        extra_kwargs = {
            'password': {'write_only': True},
        }

之后，将UserSerializer中的 user 字段设置为AuthorSerializer的实例，并以这种方式覆盖 create 方法：

class AuthorSerializer(serializers.ModelSerializer):
    user = UserSerializer()
    
    class Meta:
        model = Author
        fields = "__all__"

        extra_kwargs = {
            'id': {'read_only': True}
        }

    def create(self, validated_data):
        user = None
        if "user" in validated_data:
            user_data = validated_data.pop("user") or {}
            user = User.objects.create_user(**user_data) # Assuming that it is default django user model
        author = Author.objects.create(user=user, **validated_data)
        author.save()
        return author

请求有效负载的 curl 脚本：

curl --location --request POST 'http://127.0.0.1:8000/users/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "user": {
        "username": "mostafa",
        "password": "abcd"
    },
    "is_author": true
}'

它的响应如下：

{
    "id": 1,
    "user": {
        "id": 1,
        "last_login": null,
        "is_superuser": false,
        "username": "mostafa",
        "first_name": "",
        "last_name": "",
        "email": "",
        "is_staff": false,
        "is_active": true,
        "date_joined": "2020-12-05T09:54:37.674749Z",
        "groups": [],
        "user_permissions": []
    },
    "is_author": true
}