django-orchestra/orchestra/models/queryset.py

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from collections import OrderedDict
from .utils import get_field_value
def group_by(qset, *fields):
""" 100% in python in order to preserve original order_by """
first = OrderedDict()
num = len(fields)
for obj in qset:
ix = 0
group = first
while ix < num:
try:
current = get_field_value(obj, fields[ix])
except AttributeError:
# Intermediary relation does not exists
current = None
if ix < num-1:
try:
group = group[current]
except KeyError:
group[current] = OrderedDict()
else:
try:
group[current].append(obj)
except KeyError:
group[current] = [obj]
ix += 1
return first