Django: How to read current select_related() values

This was a bit of a tricky bit of information to get out. The information for select_related() is stored as a nested map. You'll need some recursive code to fetch that back out.

view sourceprint?

01.def generate_field_key(map, key, ancestor=None):

02.  values = []

03.  if ancestor:

04.    parent = '%s__%s' % (ancestor, key)

05.  else:

06.    parent = key

07.  values.append(parent)

08.  for k, v in map.items():

09.    values.extend(generate_field_key(v, k, parent))

10.  return values

11. 

12. 

13.# Select related is a nested map

14.qs = Something.objects.all().select_related('hey', 'hey__there')

15.select_related_data = qs.query.select_related

16.select_related = []

17. 

18.# This can be a map or False

19.if select_related_data:

20.  for key, items in select_related_data.items():

21.    select_related += generate_field_key(items, key, None)

22. 

23.print select_related

All good?