How to combine a queryset with a calculated field (which is created based on the same queryset)?

Question

Django

Model manager

class DairyManager(models.Manager): 
    def get_queryset(self):
        return super(DairyManager, self).get_queryset().extra(select={'totalsum':'count*cost'})

Model

class Dairy(models.Model):
...
    count = models.IntegerField("Количество")
    cost = models.FloatField('Цена')
...
    total = DairyManager()
    objects = models.Manager()

How do I combine these qs1 and qs2 to end up with one table???
view

qs1 = Dairy.total.all()
qs2 = Dairy.objects.all()

Answer 1

The idea is that it might work

qs1.union(qs2)

The documentation says that union is used for merging, but in fact this does not always work for some reason. An error may come out saying qs1 does not have a union attribute