I have made a new tab in res.partner so that I can see in what events the customer is registred.

How can I filter this in this tab, so that I see all events the customer is in?

 <?xml version="1.0" encoding="utf-8"?>
<openerp>
 <data>
 <record model="ir.ui.view" id="res_partner_view"> 
 <field name="name">res.partner.form</field>
 <field name="model">res.partner</field>
 <field name="inherit_id" ref="base.view_partner_form"/>
 <field name="arch" type="xml">
 <xpath expr="//notebook[last()]" position="inside">
 <page string="Events">
 <!--<field name="testing" domain="('registration_ids', '=', customer)"/>-->
 </page>
 </xpath>
 </field>
 </record>
 </data>
</openerp>

# -*- coding: utf-8 -*-
from openerp import models, fields
 class res_partner(models.Model):

 _inherit = ["res.partner"]
 testing = fields.Many2many('event.event', 'registration')

How can I solve that?

Thank you very much