Django REST 框架获取流通知

Question

我正在尝试使用 rest 框架遵循 django 的 getstream 文档。 https://github.com/GetStream/stream-django

这是从 drf 教程 https://github.com/morenoh149/django-rest-framework-getstream 克隆的最小 drf api

我收到一个错误

TypeError at /notifications/
Object of type Feed is not JSON serializable

在浏览器中打开/notifications/ 时。如何编写一个端点来显示用户的通知？

views.py

class NotificationViewSet(viewsets.ViewSet):
"""
This viewset returns a notifications feed for the logged in user.
The feed contains events for when a relevant snippet is created.
"""
serializer_class = NotificationSerializer

def list(self, request):
    user_id = request.user.id
    notification_feed = feed_manager.get_notification_feed(user_id)
    return Response(notification_feed)

序列化器.py

class ActivitySerializer(serializers.Serializer):
    id = serializers.UUIDField()
    foreign_id = serializers.CharField()
    verb = serializers.CharField()
    time = serializers.DateTimeField()

    def __init__(self, *args, **kwargs):
        object_serializer = kwargs.pop("object_serializer", None)
        actor_serializer = kwargs.pop("actor_serializer", None)
        super().__init__(self, *args, **kwargs)
        if object_serializer:
            self.fields["object"] = object_serializer()
        else:
            self.fields["object"] = serializers.CharField()
        if actor_serializer:
            self.fields["actor"] = actor_serializer()
        else:
            self.fields["actor"] = serializers.CharField()


class AggregatedSerializer(ActivitySerializer):
    group = serializers.CharField()
    activities = ActivitySerializer(many=True)


class NotificationSerializer(AggregatedSerializer):
    is_seen = serializers.BooleanField()
    is_read = serializers.BooleanField()

Answer 1

谢谢 JPG，你是对的。通过更多步骤，您甚至可以获得“丰富”的活动。 Harry Moreno，查看我在 github 上提供的示例：

https://github.com/pterk/django_twitter/blob/master/stream_twitter/views.py#L141 复制到这里为您提供方便：

class TimelineAPIView(APIView):
    """
    Timeline as an api view, enriched with local data
    """
    def get(self, request):
        feeds = feed_manager.get_news_feeds(self.request.user.id)
        activities = feeds.get('timeline').get()['results']
        enriched_activities = enricher.enrich_activities(activities)
        serializer = get_activity_serializer(enriched_activities, TweetSerializer, None, many=True)
        return Response(serializer.data)

Answer 2

我不确定 list() 方法中的代码 sn-p。但是，我认为您将 Feed 模型实例返回到 Response 类，但 DRF 需要一些 JSON 类型的数据。

因此，在 NotificationSerializer 的帮助下返回 Feed 实例的序列化版本，如下所示

class NotificationViewSet(viewsets.ViewSet):
    """
    This viewset returns a notifications feed for the logged in user.
    The feed contains events for when a relevant snippet is created.
    """
    serializer_class = NotificationSerializer

    def list(self, request):
        user_id = request.user.id
        notification_feed = feed_manager.get_notification_feed(user_id)
        serializer = NotificationSerializer(notification_feed)
        serializer.is_valid() # this has no effect in your code
        return Response(serializer.data)