1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
import django
from django.core.exceptions import ValidationError
if django.VERSION < (2, 0):
from django.utils.translation import ugettext_lazy as _
else:
# Aliased since Django 2.0 https://github.com/django/django/blob/2.0/django/utils/translation/__init__.py#L80-L81
from django.utils.translation import gettext_lazy as _
from django.contrib.admin import FieldListFilter
from django.contrib.admin.options import IncorrectLookupParameters
from bitfield import Bit, BitHandler
class BitFieldListFilter(FieldListFilter):
"""
BitField list filter.
"""
def __init__(self, field, request, params, model, model_admin, field_path):
self.lookup_kwarg = field_path
self.lookup_val = int(request.GET.get(self.lookup_kwarg, 0))
self.flags = field.flags
self.labels = field.labels
super(BitFieldListFilter, self).__init__(
field, request, params, model, model_admin, field_path)
def queryset(self, request, queryset):
filter_kwargs = dict(
(p, BitHandler(v, ()))
for p, v in self.used_parameters.items()
)
if not filter_kwargs:
return queryset
try:
return queryset.filter(**filter_kwargs)
except ValidationError as e:
raise IncorrectLookupParameters(e)
def expected_parameters(self):
return [self.lookup_kwarg]
def choices(self, cl):
yield {
'selected': self.lookup_val == 0,
'query_string': cl.get_query_string({}, [self.lookup_kwarg]),
'display': _('All'),
}
for number, flag in enumerate(self.flags):
bit_mask = Bit(number).mask
yield {
'selected': self.lookup_val == bit_mask,
'query_string': cl.get_query_string({self.lookup_kwarg: bit_mask}),
'display': self.labels[number],
}
|
