[ADD] partner_contact_lang: Manage language in contacts (#302)

===========================
Manage language in contacts
===========================

Odoo by default propagate language field to the created contacts from their
form, but it doesn't allow to change it once created.

This module fills this gap, and also provides other facilities for the
contact language management:

* Put the language of the parent company when the contact doesn't have a
  language and this parent company is assigned.
* When the company changes the language, it fills with the same language all
  the contacts that don't have any.

Usage
=====

Go to any partner that is a company and has contacts. Click on one contact
and you will be able to edit the language.

partner_contact_lang/README.rst

@@ -0,0 +1,63 @@
+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+   :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+   :alt: License: AGPL-3
+
+===========================
+Manage language in contacts
+===========================
+
+Odoo by default propagate language field to the created contacts from their
+form, but it doesn't allow to change it once created.
+
+This module fills this gap, and also provides other facilities for the
+contact language management:
+
+* Put the language of the parent company when the contact doesn't have a
+  language and this parent company is assigned.
+* When the company changes the language, it fills with the same language all
+  the contacts that don't have any.
+
+Usage
+=====
+
+Go to any partner that is a company and has contacts. Click on one contact
+and you will be able to edit the language.
+
+.. image:: https://odoo-community.org/website/image/ir.attachment/5784_f2813bd/datas
+   :alt: Try me on Runbot
+   :target: https://runbot.odoo-community.org/runbot/134/8.0
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues
+<https://github.com/OCA/partner-contact/issues>`_. In case of trouble, please
+check there if your issue has already been reported. If you spotted it first,
+help us smashing it by providing a detailed and welcomed feedback.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Pedro M. Baeza <pedro.baeza@tecnativa.com>
+
+Icon
+----
+* Original Odoo icons.
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: http://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+To contribute to this module, please visit https://odoo-community.org.

partner_contact_lang/__init__.py

@@ -0,0 +1,4 @@
+# -*- coding: utf-8 -*-
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import models

partner_contact_lang/__openerp__.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# © 2016 Pedro M. Baeza <pedro.baeza@tecnativa.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+{
+    'name': 'Manage language in contacts',
+    'version': '8.0.1.0.0',
+    'category': 'Partner Management',
+    'license': 'AGPL-3',
+    'author': 'Tecnativa,'
+              'Odoo Community Association (OCA)',
+    'website': 'https://www.tecnativa.com',
+    'depends': [
+        'base',
+    ],
+    'data': [
+        'views/res_partner_view.xml',
+    ],
+    'installable': True
+}

partner_contact_lang/models/__init__.py

@@ -0,0 +1,4 @@
+# -*- coding: utf-8 -*-
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import res_partner

partner_contact_lang/models/res_partner.py

@@ -0,0 +1,42 @@
+# -*- 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_address(self, use_parent_address, parent_id):
+        """Change language if the parent company changes and there's no
+        language defined yet"""
+        res = super(ResPartner, self).onchange_address(
+            use_parent_address, 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