Example for cleaner multi-object response messages.

response_example.py

class DeleteGroup(tables.Action):
    name = "delete"
    verbose_name = _("Delete")
    verbose_name_plural = _("Delete Security Groups")
    classes = ('danger',)

    def allowed(self, request, security_group=None):
        if not security_group:
            return True
        return security_group.name != 'default'

    def handle(self, table, request, object_ids):
        tenant_id = request.user.tenant_id
        deleted = []
        for obj_id in object_ids:
            obj = table.get_object_by_id(int(obj_id))
            if obj.name == "default":
                messages.info(request, _("The default group can't be deleted"))
                continue
            try:
                security_group = api.security_group_delete(request, obj_id)
                deleted.append(obj)
                LOG.info('Deleted security_group: "%s"' % obj.name)
            except novaclient_exceptions.ClientException, e:
                LOG.exception("Error deleting security group")
                messages.error(request, _('Unable to delete group: %s')
                                         % obj.name)
        if deleted:
            messages.success(request,
                             _('Successfully deleted security groups: %s')
                               % ", ".join([group.name for group in deleted]))
        return shortcuts.redirect('horizon:nova:access_and_security:index')