django - DRF : Remove field on model serializer after validation but before creation (on CreateAPIView)

Question

我在网站上有一个联系表单，该表单正在发布到 CreateAPIView 以创建模型的新实例(最终通过电子邮件发送给管理员)。在我的序列化器上，我有一个蜜 jar 字段来帮助拒绝垃圾邮件。

型号:

class Message(models.Model):
    name = ...
    message = ...

和序列化器:

class MessageSerializer(serializers.ModelSerializer):

    # Honeypot field
    url = serializers.CharField(allow_blank=True, required=False)

    class Meta:
        model = Message
        fields = '__all__'

    def validate_url(self, value):
        if value and len(value) > 0:
            raise serializers.ValidationError('Spam')
        return value

并查看:

class MessageView(generics.CreateAPIView):
    ''' Create a new contact form message. '''
    serializer_class = MessageSerializer

我的问题是，就目前情况而言，当我发布到此 View 时，我收到错误:

TypeError: Got a TypeError when calling Message.objects.create(). This may be because you have a writable field on the serializer class that is not a valid argument to Message.objects.create(). You may need to make the field read-only, or override the MessageSerializer.create() method to handle this correctly.

很明显，seriazlier 正在尝试将 url 字段保存到 CreateApiView.perform_create()

中的模型中

我尝试将 read_only 添加到序列化器字段，但这意味着完全跳过 url_validate 方法。

如何在验证发生之前将该字段保留在序列化器上，并在 perform_create() 中调用 serializer.save() 之前将其删除？

Answer 1

您可以覆盖创建方法，例如:

class MessageSerializer(serializers.ModelSerializer):

    # Honeypot field
    url = serializers.CharField(allow_blank=True, required=False)

    class Meta:
        model = Message
        fields = '__all__'

    def validate_url(self, value):
        if value and len(value) > 0:
            raise serializers.ValidationError('Spam')
        return value

    def create(self, validated_data):
        data = validated_data.pop('url')
        return Message.objects.create(**data)