django can we select related a field on a prefetch related model?

Question

Assuming these as django model for the sake of simplcity:

class A():

    a = manytomany(\'B\')

class B():

    b = charfield()
    z = foreignkey(\'C\')

class         


        

Answer 1

You only need one prefetch_related call:

foo = A.objects.prefetch_related('a__z').get(pk=1)

This will prefetch both tables. In Django 1.7+ you can improve performance by using a Prefetch object, as in koniiiik's answer.