SimpleListFilter is giving "NotImplementedError"

Hola,

After successfully implementing two range based filters using the admin's list_filter docs: PATH/ref/contrib/admin/index.html#django.contrib.admin.ModelAdmin.list_filter

I've added one more filter, but now I'm getting a NotImplementedError and I can't see what I've done wrong. The model has a field called "island" and I would like to distinguish between the main island and the "outer islands" (all the rest). Note the commented out returns - me trying to find any subtle changes to fix this:

class IslandFilter(admin.SimpleListFilter):

    title = 'islands'

    parameter_name = 'island'

    

    def lookup(self, request, model_admin):

        return (

            ('tarawa', 'Tarawa'),

            ('outer-islands', 'Outer Islands'),

        )   

    def queryset(self, request, queryset):

        if self.value == 'tarawa':

            return queryset.filter(island=='Tarawa')

            #return queryset.filter(island__exact='Tarawa')

        else:

            return queryset.exclude(island=='Tarawa')

            #return queryset.exclude(island__exact='Tarawa')

class ApplicantAdmin(admin.ModelAdmin):

     list_filter = ('gender', 'disability', MathTestFilter, EnglishTestFilter, IslandFilter,'successful', 'applied_for', 'eligibility')

Can anyone see what I've done wrong please?

Cheers

L.

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http://www.warrenellis.com/?p=14314

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