Django通过QuerySet对象循环并添加临时字段用于过滤

Question

我使用DjangoRestFramework并且有一个queryset，它返回通用ListAPIView的对象。我想遍历查询集中的每个对象并运行下面的代码来使用geopy distance.distance计算距离值，然后将其添加为临时字段，以便稍后我可以根据此新的距离字段过滤查询集。

目前我有以下代码，但它似乎没有保存新的临时字段address.distance，我想在显示每个对象的新距离值时返回新的查询集

在views.py中

：

class business_list(generics.ListAPIView):
    serializer_class = BusinessSerializer
    @csrf_exempt
    def get_queryset(self):
        """
        List all businesses.
        """
        queryset = Business.objects.all()
        distanceParam = self.request.QUERY_PARAMS.get('distance', None)
        locationParam = self.request.QUERY_PARAMS.get('location', None)
        if distanceParam is not None and locationParam is not None:
            for business in queryset:
                storelocations = ()
                for location in business.locations.all():
                    long = location.address.all()[:1].get().long
                    lat = location.address.all()[:1].get().lat
                    businessCoords = (lat, long)
                    testCoords = (40.795745, -73.948646)
                    address = location.address.all()[:1].get()
                    address_two = location.address.all()[:1].get()
                    address.distance = distance.distance(businessCoords, testCoords).miles
                    # my_obj_list = list(address, address_two)
                    # queryset = my_obj_list
            # wd = Business.objects.annotate(distance="lol")
            # queryset = wd
        return queryset