eiru_car_services/model/res_partner.py

# -*- coding: utf-8 -*-

from openerp import models, fields, api

class ResPartnerCar(models.Model):
    _inherit = 'res.partner'

    is_insurer = fields.Boolean()
    is_agent = fields.Boolean()

    car_ids = fields.One2many(
        'car.service',
        'partner_id',
    )
    car_count = fields.Integer(
        string='Numero de autos',
        compute='_get_car_count',
    )

    @api.one
    @api.depends('car_ids')
    def _get_car_count(self):
        self.car_count = len(self.car_ids)


    car_secure_ids = fields.One2many(
        'car.service',
        'secure_id',
    )
    car_secure_count = fields.Integer(
        string='Asegurados',
        compute='_get_car_secure_count',
    )

    @api.one
    @api.depends('car_secure_ids')
    def _get_car_secure_count(self):
        self.car_secure_count = len(self.car_secure_ids)