Question

Does the order select_related is put in a queryset chain matter?

i.e. is there any difference between:

SomeModel.objects.select_related().all()

and

SomeModel.objects.all().select_related()

In my brief testing they both seem to cache objects but I’m wondering if there are any performance differences or anything else I’m not realizing is different?

Answer 1

They both execute the same exact query. So no, there would be no performance differences.

To test, try this:

q = SomeModel.objects.select_related().all()
print q.query

q = SomeModel.objects.all().select_related()
print q.query

You should get the same exact query