Creating Custom Filters for list_filter in Django Admin

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You can indeed add custom filters to admin filters by extending SimpleListFilter. For instance, if you want to add a continent filter for ‘Africa’ to the country admin filter used above, you can do the following:

In admin.py:

from django.contrib.admin import SimpleListFilter

class CountryFilter(SimpleListFilter):
    title="country" # or use _('country') for translated title
    parameter_name="country"

    def lookups(self, request, model_admin):
        countries = set([c.country for c in model_admin.model.objects.all()])
        return [(c.id, c.name) for c in countries] + [
          ('AFRICA', 'AFRICA - ALL')]

    def queryset(self, request, queryset):
        if self.value() == 'AFRICA':
            return queryset.filter(country__continent="Africa")
        if self.value():
            return queryset.filter(country__id__exact=self.value())

class CityAdmin(ModelAdmin):
    list_filter = (CountryFilter,)

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