Django rest ModelViewSet 序列化程序创建失败

Question

我有两个模型具有以下关系：

class Library(models.Model):
    library_id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=30)
    ...

class Reader(models.Model):
    user = models.OneToOneField(User)
    phone = models.CharField(max_length=30)
    ...
    # A library has many readers
    which_library = models.ForeignKey('Library', related_name='readers', on_delete=models.CASCADE)

我定义了序列化程序如下（我在为特定库创建 Reader 时直接创建用户）：

class ReaderSerializer(serializers.ModelSerializer):
    username = serializers.CharField(source='user.username')
    email = serializers.CharField(source='user.email')
    password = serializers.CharField(source='user.password')

    class Meta:
        model = Reader
        #fields = '__all__'
        depth = 1
        fields = ('id', 'username', 'email', 'password', 'phone', 'address', 'dob', 'which_library')


    def create(self, validated_data):
        user_data = validated_data.pop('user')
        user = User.objects.create(**user_data)
        user.set_password(user_data['password'])
        user.save()
        reader = Reader.objects.create(user=user, **validated_data)
        return reader

我正在编写一个 ModelViewSet，如下所示：

class ReaderViewSet(viewsets.ModelViewSet):

serializer_class = ReaderSerializer

def get_queryset(self):

    readers = Reader.objects.filter(which_library=self.kwargs.get('library_id'))
    return readers

URL: router.register(r'readers/(?P<library_id>[0-9]+)', ReaderViewSet, base_name='readers')

我的 GET 调用成功，我获得了特定图书馆中的所有读者。

我正在使用以下 JSON 数据进行 POST 调用：

{
    "username": "three",
    "email": "three@gmail.com",
    "password": "5647",
    "phone": "836365",
    "address": "sample6 address",
    "which_library": "2"
}

也通过删除 "which_library" 但都给我错误：

IntegrityError at /api/readers/2/
(1048, "Column 'which_library_id' cannot be null")

我做错了什么？

Answer 1

尝试删除 depth = 1 选项。来自 docs:

The default ModelSerializer uses primary keys for relationships, but you can also easily generate nested representations using the depth option.

看起来这个选项序列化程序需要对象而不是 id。

Django rest ModelViewSet 序列化程序创建失败

Django rest ModelViewSet serializer create fails

django

django-rest-framework

django-rest-viewsets