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Django Admin: Null/Not null filters for DateTimeField

Author:
merutak
Posted:
May 1, 2016
Language:
Python
Version:
Not specified
Score:
0 (after 0 ratings)

This extends Django admin's default date filter, by adding "None" and "Not none" options, that work as expected.

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from django.contrib.admin.filters import DateFieldListFilter

class DateFieldListFilterOrNull(DateFieldListFilter):
    def __init__(self, field, request, params, model, model_admin, field_path):
        self.lookup_kwarg_isnull = '%s__isnull' % (field_path, )
        super(DateFieldListFilterOrNull, self).__init__(field, request, params, model, model_admin, field_path)
        self.links = self.links + (
           ('None', {
                self.lookup_kwarg_isnull: 'True',
            }),
           ('Not none', {
                self.lookup_kwarg_isnull: 'False',
            }),
           )

    def expected_parameters(self):
        return super(DateFieldListFilterOrNull, self).expected_parameters() + [self.lookup_kwarg_isnull, ]

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