Question

model:

class Car(models.Model):
    ...

class CarInstance(models.Model):
    car =  models.ForeignKey(Car)

Isn’t posible to use one queryset inside another?
Like:

data1 = Car.objects.filter(id__in = [1,3,6])
data2 = CarInstance.objects.filter(car = data1)

I need to use both queryset objects in the future. And Car can have a few CarInstance objects. I think isn’t possible to unite in one queryset like data2__data1.

And cycle like:

car_list = []
for i in data1:
  car_list.append(i.id)
data2 = CarInstance.objects.filter(car__in = car_list)

looks ineffective. Thanks.

Answer 1

It looks like you want to do this

data2 = CarInstance.objects.filter(car__id__in = [1,3,6])