def METHOD_NAME(self, request, form_url='', extra_context=None):
    extra_context = extra_context or {}
    extra_context['additional_addlinks'] = extra_context.get('additional_addlinks') or []
    # extra_context['additional_addlinks'].extend(self.get_additional_addlinks(request))
    return super().METHOD_NAME(request, form_url, extra_context=extra_context)