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from django.utils.translation import ugettext_lazy as _
from django.contrib.admin import FieldListFilter
from bitfield import Bit
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
super(BitFieldListFilter, self).__init__(field,
request, params, model, model_admin, field_path)
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': flag,
}
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