*You can define your own NullListFilter. I did it this way:*
class NullListFilter(FieldListFilter):
def __init__(self, field, request, params, model, model_admin,
field_path):
self.lookup_kwarg = '%s__isnull' % field_path
self.lookup_val = request.GET.get(self.lookup_kwarg, None)
super(NullListFilter, self).__init__(field, request, params, model,
model_admin, field_path)
def expected_parameters(self):
return [self.lookup_kwarg]
def choices(self, cl):
for lookup, title in (
(None, _('All')),
('False', _('Yes')),
('True', _('No'))):
yield {
'selected': self.lookup_val == lookup,
'query_string': cl.get_query_string({
self.lookup_kwarg: lookup, }),
'display': title,
}
FieldListFilter.register(lambda f: True, NullListFilter)
*Then you can use it in admin like this:*
list_filter = [('field_which_is_foreign_key', NullListFilter)]
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