res_partner_company_messages

res_partner_company_messages/README.rst

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+Aggregate messages from company's contacts
+==========================================
+
+By default, odoo displays under partner form only its own messages. The module shows under company form both their own messages and the messages of any contacts attached to that company. 
+
+Tested on Odoo 8.0 ea60fed97af1c139e4647890bf8f68224ea1665b

res_partner_company_messages/__init__.py

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+import models

res_partner_company_messages/__openerp__.py

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+{
+    'name': "Aggregate messages from company's contacts",
+    'version': '1.0.0',
+    'author': 'Ivan Yelizariev',
+    'category': 'Custom',
+    'website': 'https://yelizariev.github.io',
+    'images': ['images/parent.png', 'images/child.png'],
+    'depends': ['mail'],
+    'data': [
+        'views.xml',
+        ],
+    'installable': True
+}

res_partner_company_messages/models.py

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+from openerp import api, models, fields, SUPERUSER_ID
+
+class mail_message(models.Model):
+    _inherit = 'mail.message'
+
+    @api.cr_uid_context
+    def message_read(self, cr, uid, ids=None, domain=None, message_unload_ids=None,
+                        thread_level=0, context=None, parent_id=False, limit=None):
+        if context and context.get('default_model') == 'res.partner':
+            partner = self.pool['res.partner'].browse(cr, uid, context.get('default_res_id'))
+            domain_by_id = domain and len(domain) == 1 and domain[0][0] == 'id' and domain[0][1] == '='
+            if partner.is_company and not domain_by_id:
+                ids = None
+                domain = [('model', '=', 'res.partner'), ('res_id', 'in', [partner.id]+partner.child_ids.ids)]
+        return super(mail_message, self).message_read(cr, uid, ids, domain, message_unload_ids, thread_level, context, parent_id, limit)

res_partner_company_messages/views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<openerp><data>
+</data></openerp>