'Generate the bus notifications of current channel for the given partner ids
:param partner_ids : the partner to send the current channel header
:returns list of bus notifications (tuple (bus_channe, message_content))'

@api.multi
def _channel_channel_notifications(self, partner_ids):

    notifications = []
    for partner in self.env['res.partner'].browse(partner_ids):
        user_id = ((partner.user_ids and partner.user_ids[0]) or False)
        if user_id:
            for channel_info in self.sudo(user_id).channel_info():
                notifications.append([(self._cr.dbname, 'res.partner', partner.id), channel_info])
    return notifications
