[ADD] Language path mixin

language_path_mixin/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+    :alt: License: AGPL-3
+
+Language path mixin
+===================
+This is a technical module to restore the possibility of Odoo to print reports
+in other languages than the user's language (for instance, the customer's
+language in the case of a sale order).
+
+Odoo 8.0 has lost that capability due to an unlucky combination of technical
+aspects of the deprecated RML report functionality and the new API. While the
+static content of the report is translated fine, any translatable fields will
+still be rendered in the language of the user.
+
+See https://github.com/odoo/odoo/issues/7301 for the original bug report.
+
+This module provides a tool for developers to work around this bug in their
+Python code.
+
+Configuration
+=============
+
+After installation of the module, you can import the mixin class that it
+provides and have any model inherit from it in your python class definition.
+
+You can then assign your class a *_language_path* member to indicate where
+to find the language into which its reports are to be translated. See the
+following code example:
+
+.. code::
+
+    class SaleOrder(models.Model):
+        _name = 'sale.order'
+        _inherit = ['sale.order', 'language.path.mixin']
+        _language_path = 'partner_id.lang'
+
+In RML reports for such a model, you can then iterate over the records in the
+correct language using
+
+    [[ repeatIn(objects.with_language_path(), 'o') ]]
+
+Usage
+=====
+
+For further information, please visit:
+
+* https://www.odoo.com/forum/help-1
+
+Known issues / Roadmap
+======================
+
+* Kudos if you find a way to do this more elegantly, preferably with a simple
+bugfix in the Odoo core
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/server-tools/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
+`here <https://github.com/OCA/server-tools/issues/new?body=module:%20language_path_mixin%0Aversion:%201.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Stefan Rijnhart <stefan@therp.nl>
+* Holger Brunn <hbrunn@therp.nl>
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://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 http://odoo-community.org.

language_path_mixin/__init__.py

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+from . import models

language_path_mixin/__openerp__.py

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+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    Odoo, an open source suite of business apps
+#    This module copyright (C) 2015 Therp BV (<http://therp.nl>).
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+{
+    'name': 'Language path mixin',
+    'summary': "Setting the partner's language in RML reports",
+    'version': '1.0',
+    'author': 'Therp BV,Odoo Community Association (OCA)',
+    'maintainer': 'Odoo Community Association (OCA)',
+    'website': 'https://github.com/OCA/server-tools',
+    'license': 'AGPL-3',
+    'category': 'Tools',
+    'depends': [
+        'base',
+    ],
+}

language_path_mixin/models/__init__.py

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+from . import language_path_mixin

language_path_mixin/models/language_path_mixin.py

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+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    Odoo, an open source suite of business apps
+#    This module copyright (C) 2015 Therp BV (<http://therp.nl>).
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+from openerp import models
+
+
+class LanguagePathMixin(models.AbstractModel):
+    """ Mixin class to print reports in a language taken from a field in the
+    record. """
+    _name = 'language.path.mixin'
+    _language_path = False
+
+    def with_language_path(self, path=None):
+        """ This method allows the system to iterate over a RecordSet with each
+        of the records being browsed in the language specified by the model's
+        _language_path attribute. Of course, this is a cache killer. It was
+        conceived to make translations in rml reports work again as using
+        setLang() in the report does not work as expected anymore in 8.0 due
+        to the way that caching works in the new API """
+        path = path or self._language_path
+        for record in self:
+            if not path:
+                yield record
+                continue
+            lang = record
+            for part in path.split('.'):
+                lang = lang[part]
+                if not lang:
+                    yield record
+                    break
+            else:
+                yield record.with_context(lang=lang)