How to use multiple models inside one viewset/serializer?

Question

I have 2 items inside my system that I have to use.But I am trying to develop a system which i have to get them inside one view and order them by "timestamp".

class CalendarEventSerializer(serializers.ModelSerializer):

    class Meta:
        model = CalendarEvent
        fields = ("id","author",...)

class CalendarItemSerializer(serializers.ModelSerializer):

    class Meta:
        model = CalendarItem
        fields = ("id","author",...)

I use ViewSet to regulate my models to paginate and filter them.

class CalendarItemViewSet(viewsets.ModelViewSet):
    permission_classes = (IsAuthenticated,)
    queryset = CalendarItem.objects.all().order_by('-timestamp')
    serializer_class = CalendarItemSerializer
    filter_backends = [UserFilterBackend,DjangoFilterBackend]
    pagination_class = StandardResultsSetPagination
    filterset_fields = ['author']

class CalendarEventViewSet(viewsets.ModelViewSet):
    permission_classes = (IsAuthenticated,)
    queryset = CalendarEvent.objects.all().order_by('-timestamp')
    serializer_class = CalendarEventSerializer
    filter_backends = [UserFilterBackend,DjangoFilterBackend]
    pagination_class = StandardResultsSetPagination
    filterset_fields = ['author']

How can I use this system to merge 2 or models into one viewset or serializer like this?

Note:I know there are some answers for similar kind of questions in stackoverflow but my code structure is but different, I want to get some viewpoints

Update

So here is what i want to do: -I am forming a feed page like facebook/instagram and combine multiple models inside one view.

-I can already do it with the viewsets above,but i want to now merge them.

-I want to sort each item by its timestamp and retrieve them inside JSON but inside one system, not like :

calendarevents:[] calendaritems []

but like:

calendarevent 1(created 2 mins ago)
calendaritem 1 (created 3 mins ago)
calendarevent 2(created 4 mins ago) 
calendaritem 2(created 5 mins ago)

I am happy to include more information,just ask.

Update 2:

class CalendarEvent(models.Model):

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    author = models.ForeignKey(User,  on_delete=models.CASCADE,related_name='calendarevents')
    charfield1 = models.CharField(max_length=300)
    integerfield1 = models.IntegerField(default='0')
    charfield2 = models.CharField(max_length=200,null=True, blank=True)
    charfield3= models.CharField(null=True,blank=True,max_length=64000)

class CalendarItem(models.Model):


    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    author = models.ForeignKey(User,  on_delete=models.CASCADE,related_name='calendaritems')
    charfield1 = models.CharField(max_length=300)
    integerfield1 = models.IntegerField(default='0')
    charfield2 = models.CharField(max_length=200,null=True, blank=True)
    charfield3= models.CharField(null=True,blank=True,max_length=64000)

Answer 1

You can customize the login using APIView and Generic APIVIEW

Here is one of the ways you can achieve what you are trying to achieve.

class GetCalenderEventAndItemsAPIView(APIView, GenericAPIView):
    permission_classes = (IsAuthenticated,)
    item_queryset = CalendarItem.objects.all().order_by('-timestamp')
    event_queryset = CalendarEvent.objects.all().order_by('-timestamp')
    item_serializer_class = CalendarItemSerializer
    event_serializer_class = CalendarEventSerializer
    filterset_fields = ['author']

    def get_paginated_query(self, _query_set):
        page = self.paginate_queryset(self.filter_queryset(_query_set))
        if page is not None:
            serializer = self.get_serializer(page, many=True)
            return self.get_paginated_response(serializer.data)
        return page

    def get(self, request, *args, **kwargs):
        event_serializer = self.event_serializer_class(self.get_paginated_query(self.event_queryset),
                                                       many=True)
        item_serializer = self.event_serializer_class(self.get_paginated_query(self.item_queryset), many=True)

        response_results = {
            "calendarevents": event_serializer.data,
            "calendaritems": item_serializer.data

        }
        return Response(response_results)

It will get you in the right direction. Just play around above way of doing it.