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