Question

我在尝试更新modified_by字段时出现此错误

Tried to update field sales.CustomersTag.modified_by with a model instance, <SimpleLazyObject: <UserProfile: Admin>>. Use a value compatible with CharField.

这是我的serializer.py：

class CustomersTagSerializer(serializers.ModelSerializer):
    created_by = serializers.CharField(read_only=True, default=serializers.CurrentUserDefault())
    modified_by = serializers.CharField(read_only=True, default=serializers.CurrentUserDefault())

    def update(self, instance, validated_data):
        instance.name = validated_data.get('name', instance.name)
        instance.modified_by = validated_data.get('modified_by', instance.modified_by)
        instance.save()
        return instance

    class Meta:
        model = models.CustomersTag
        fields = (
            'id',
            'name',
            'created_date',
            'modified_date',
            'created_by',
            'modified_by',
        )

这是我的view.py：

class CustomerTagGetIdPutView(generics.RetrieveAPIView,
                              mixins.UpdateModelMixin):
    permission_classes = (AllowAny,)
    queryset = models.CustomersTag.objects.all()
    serializer_class = CustomersTagSerializer

    def get_object(self):
        id = self.kwargs['id']
        obj = generics.get_object_or_404(models.CustomersTag, id=id)
        return obj

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def patch(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

我尝试了很多来解决这个问题，但我不能......任何人都可以帮我解决这个问题

Answer 1

您可以在模型中调用save()时执行此操作。例如：

class CustomersTagSerializer(serializers.ModelSerializer):
     created_by = models.ForeignKey(User, null=True, editable=False)
     modified_by = models.ForeignKey(User, null=True, editable=False)

def save(self, *args, **kwargs):
    user = get_current_user()
    if user and user.is_authenticated():
        self.modified_by = user
        if not self.id:
            self.created_by = user
    super(CustomersTagSerializer, self).save(*args, **kwargs)

Answer 2

如果您正在使用Django REST Framework通用视图而不覆盖get_serializer或get_serializer_context等方法的行为，则序列化程序将接收上下文对象。此上下文对象是包含请求和视图对象的字典。

也就是说，您可以通过覆盖序列化程序中的create()和update()来执行此操作。例如：

class CustomersTagSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.CustomersTag
        fields = (
            'id',
            'name',
            'created_date',
            'modified_date',
            'created_by',
            'modified_by',
        )

    def create(self, validated_data):
        user = self.context['request'].user
        return models.CustomersTag.objects.create(
            created_by=user, **validated_data)

    def update(self, instance, validated_data):
        user = self.context['request'].user
        instance.name = validated_data.get('name', instance.name)
        instance.modified_by = user
        instance.save()
        return instance

但是，如果您想在模型中维护版本的日志历史记录，可以使用像django-auditlog这样的包。

如何使用CurrentUserDefualt更新modified_by字段

2 个答案: