partner-contact/partner_contact_lang/models/res_partner.py

# -*- coding: utf-8 -*-
# © 2016 Pedro M. Baeza <pedro.baeza@tecnativa.com>
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from openerp import api, models


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

    @api.multi
    def write(self, vals):
        """Propagate a language change in the partner to the child contacts."""
        res = super(ResPartner, self).write(vals)
        if vals.get('lang'):
            childs = self.search([
                ('id', 'child_of', self.ids),
                ('lang', '=', False),
            ])
            if childs:
                childs.write({'lang': vals['lang']})
        return res

    @api.multi
    def onchange_parent_id(self, parent_id):
        """Change language if the parent company changes and there's no
        language defined yet"""
        res = super(ResPartner, self).onchange_parent_id(parent_id)
        if parent_id and self.parent_id.id != parent_id and not self.lang:
            parent = self.browse(parent_id)
            val = res.setdefault('value', {})
            val['lang'] = parent.lang
        return res

    @api.multi
    @api.onchange('lang')
    def onchange_lang(self):
        if self.lang:
            childs = self.child_ids.filtered(lambda x: not x.lang)
            for child in childs:
                child.lang = self.lang