cooperative-market/beesdoo_base/models/partner.py

# -*- coding: utf-8 -*-
from openerp import models, fields, api
from openerp.addons.beesdoo_base.tools import concat_names

class Partner(models.Model):

    _inherit = 'res.partner'

    first_name = fields.Char('First Name')
    last_name = fields.Char('Last Name', required=True)

    @api.onchange('first_name', 'last_name')
    def _on_change_name(self):
        self.name = concat_names(self.first_name, self.last_name)