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IsNullFieldListFilter

Author:
ssokolow
Posted:
June 23, 2012
Language:
Python
Version:
1.4
Score:
0 (after 0 ratings)

As the title does a pretty good job of condensing, this is a subclass of FieldListFilter for the Django 1.4 Admin system which allows you filter by whether a field is or is not NULL.

For example, if you had an Author model and wanted to filter it by whether authors were also users of the site, you could add this to your AuthorAdmin class:

list_filter = (
    ('user_acct', IsNullFieldListFilter),
)

For the record, it began life as a modified version of BooleanFieldListFilter from django.contrib.admin.filters.

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from django.utils.translation import ugettext_lazy as _
from django.contrib.admin import FieldListFilter

class IsNullFieldListFilter(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(IsNullFieldListFilter, 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,
            }

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