МР
Size: a a a
МР
AG
МР
Е~
МР
AG
>>> Author.objects.annotate(total_pages=Sum('book__pages'))
AG
МР
>>> Author.objects.annotate(total_pages=Sum('book__pages'))
AG
... migrate <app name>
Е~
>>> Author.objects.annotate(total_pages=Sum('book__pages'))
N
M
A
r
r
r
DT
M
M
DT