We have following models:

class Publisher(models.Model):
    name = models.CharField(max_length=32)
    local_name = models.CharField(max_length=32)
    url_pattern = models.CharField(max_length=128)
    enabled = models.BooleanField(default=True)
    home_page = models.BooleanField(default=False)
    category = models.ForeignKey(NewspaperCategory, null=True)


class Newspaper(models.Model):
    class Meta:
        unique_together = ("publisher", "date")
        ordering = ("-date",)

    publisher = models.ForeignKey(Publisher)
    image = models.ImageField(upload_to=newspaper_upload_to)
    thumbnail = models.ImageField(upload_to=newspaper_thumbnail_upload_to)
    date = models.DateField()

I have a APIView (Django rest framework) and there are several different query parameters which filter the output of API. I'd like to have a "latest" query parameter which lists only the latest version of each publisher. Also, I need to be able to do further filtering and slicing on that QuerySet before evaluating it.

But the result of query should be Newspaper instances not dict so I can feed them to my serializer. My view looks like this at the moment :

class Newspapers(APIView):
    def get(self, request):

        queryset = models.Newspaper.objects.filter(deleted=False).prefetch_related('publisher')
        if "latest" in request.GET:
            # doing something here with queryset            
        if "publisher_id" in request.GET:
            queryset = queryset.filter(publisher_id=request.GET['publisher_id'])
        if "category" in request.GET:
            queryset = queryset.filter(publisher__category_id=request.GET['category'])
        if "before" in request.GET:
            queryset = queryset.filter(date__lt=request.GET['before'])
        if "after" in request.GET:
            queryset = queryset.filter(date__gte=request.GET['after'])
        if "home_page" in request.GET:
            queryset = queryset.filter(publisher__home_page=request.GET['home_page'].lower() == 'true')
        queryset = queryset.order_by('-date', 'publisher__order')
        return PagingResponse(
            request,
            serializers.NewspaperVersionSerializer,
            query=queryset,
            identifier_name='date'
        )