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authentik/passbook/lib/widgets.py

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"""Utility Widgets"""
from itertools import groupby
from django.forms.models import ModelChoiceField, ModelChoiceIterator
class GroupedModelChoiceIterator(ModelChoiceIterator):
"""ModelChoiceField which groups objects by their verbose_name"""
def __iter__(self):
if self.field.empty_label is not None:
yield ("", self.field.empty_label)
queryset = self.queryset
# Can't use iterator() when queryset uses prefetch_related()
if not queryset._prefetch_related_lookups:
queryset = queryset.iterator()
# We can't use DB-level sorting as we sort by subclass
queryset = sorted(queryset, key=lambda x: x._meta.verbose_name)
for group, objs in groupby(queryset, key=lambda x: x._meta.verbose_name):
yield (group, [self.choice(obj) for obj in objs])
class GroupedModelChoiceField(ModelChoiceField):
"""ModelChoiceField which groups objects by their verbose_name"""
iterator = GroupedModelChoiceIterator