Custom Filter in Django Admin on Django 1.3 or below

Thanks to gpilotino for giving me the push into the right direction for implementing this.

I noticed the question's code is using a datetime to figure out when its live . So I used the DateFieldFilterSpec and subclassed it.

from django.db import modelsfrom django.contrib.admin.filterspecs import FilterSpec, ChoicesFilterSpec,DateFieldFilterSpecfrom django.utils.encoding import smart_unicodefrom django.utils.translation import ugettext as _from datetime import datetimeclass IsLiveFilterSpec(DateFieldFilterSpec):    """    Adds filtering by future and previous values in the admin    filter sidebar. Set the is_live_filter filter in the model field attribute    'is_live_filter'.    my_model_field.is_live_filter = True    """    def __init__(self, f, request, params, model, model_admin):        super(IsLiveFilterSpec, self).__init__(f, request, params, model,                                               model_admin)        today = datetime.now()        self.links = (            (_('Any'), {}),            (_('Yes'), {'%s__lte' % self.field.name: str(today),                       }),            (_('No'), {'%s__gte' % self.field.name: str(today),                    }),        )    def title(self):        return "Is Live"# registering the filterFilterSpec.filter_specs.insert(0, (lambda f: getattr(f, 'is_live_filter', False),                               IsLiveFilterSpec))

To use you can put the above code into a filters.py, and import it in the model you want to add the filter to

you have to write a custom FilterSpec (not documentend anywhere).Look here for an example:

http://www.djangosnippets.org/snippets/1051/

In current django development version there is the support for custom filters: https://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.list_filter