models.py 文件源码

def hand_clean_DELETE(self):
        """
        We don't validate the 'DELETE' field itself because on
        templates it's not rendered using the field information, but
        just using a generic "deletion_field" of the InlineModelAdmin.
        """
        if self.cleaned_data.get(DELETION_FIELD_NAME, False):
            using = router.db_for_write(self._meta.model)
            collector = NestedObjects(using=using)
            if self.instance.pk is None:
                return
            collector.collect([self.instance])
            if collector.protected:
                objs = []
                for p in collector.protected:
                    objs.append(
                        # Translators: Model verbose name and instance representation,
                        # suitable to be an item in a list.
                        _('%(class_name)s %(instance)s') % {
                            'class_name': p._meta.verbose_name,
                            'instance': p}
                    )
                params = {'class_name': self._meta.model._meta.verbose_name,
                          'instance': self.instance,
                          'related_objects': get_text_list(objs, _('and'))}
                msg = _("Deleting %(class_name)s %(instance)s would require "
                        "deleting the following protected related objects: "
                        "%(related_objects)s")
                raise ValidationError(msg, code='deleting_protected', params=params)