widgets.py 文件源码

def label_for_value(self, value):
        key = self.rel.get_related_field().name
        try:
            obj = self.rel.model._default_manager.using(self.db).get(**{key: value})
        except (ValueError, self.rel.model.DoesNotExist):
            return ''

        label = '&nbsp;<strong>{}</strong>'
        text = Truncator(obj).words(14, truncate='...')
        try:
            change_url = reverse(
                '%s:%s_%s_change' % (
                    self.admin_site.name,
                    obj._meta.app_label,
                    obj._meta.object_name.lower(),
                ),
                args=(obj.pk,)
            )
        except NoReverseMatch:
            pass  # Admin not registered for target model.
        else:
            text = format_html('<a href="{}">{}</a>', change_url, text)

        return format_html(label, text)