Removing the old url resolution method in contrib.auth.admin.UserAdmin which...

    ordering = ('username',)

    filter_horizontal = ('user_permissions',)

    def __call__(self, request, url):

        # this should not be here, but must be due to the way __call__ routes

        # in ModelAdmin.

        if url is None:

            return self.changelist_view(request)

        if url.endswith('password'):

            return self.user_change_password(request, url.split('/')[0])

        return super(UserAdmin, self).__call__(request, url)

    def get_fieldsets(self, request, obj=None):

        if not obj:

            return self.add_fieldsets