Re: field-null or not-null filter?

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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