class MailTemplate(models.Model):
    "Templates for sending email"
    _name = "mail.template"
    
    @api.multi
    def send_mail_with_multiple_attachments(self, res_id, additional_attachments, force_send=False, raise_exception=False):
        """Generates a new mail message for the given template and record,
           and schedules it for delivery through the ``mail`` module's scheduler.

           :param int res_id: id of the record to render the template with
                              (model is taken from the template)
           :param bool force_send: if True, the generated mail.message is
                immediately sent after being created, as if the scheduler
                was executed for this message only.
           :returns: id of the mail.message that was created
        """
        self.ensure_one()
        Mail = self.env['mail.mail']
        Attachment = self.env['ir.attachment']  # TDE FIXME: should remove dfeault_type from context

        # create a mail_mail based on values, without attachments
        values = self.generate_email(res_id)
        values['recipient_ids'] = [(4, pid) for pid in values.get('partner_ids', list())]
        attachment_ids = values.pop('attachment_ids', [])
        attachments = values.pop('attachments', [])
        # add a protection against void email_from
        if 'email_from' in values and not values.get('email_from'):
            values.pop('email_from')
        mail = Mail.create(values)

        # manage attachments
        attachments.extend(additional_attachments)
        for attachment in attachments:
            attachment_data = {
                'name': attachment[0],
                'datas_fname': attachment[0],
                'datas': attachment[1],
                'res_model': 'mail.message',
                'res_id': mail.mail_message_id.id,
            }
            attachment_ids.append(Attachment.create(attachment_data).id)
        if attachment_ids:
            values['attachment_ids'] = [(6, 0, attachment_ids)]
            mail.write({'attachment_ids': [(6, 0, attachment_ids)]})
        
        if force_send:
            mail.send(raise_exception=raise_exception)
        return mail.id  # TDE CLEANME: return mail + api.returns ?