Add traking on warn fields

WORK IN PROGRESS: port hr_holidays_usability

purchase_usability/partner.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# © 2017 Akretion (Alexis de Lattre <alexis.delattre@akretion.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import models, fields, api
+
+
+class ResPartner(models.Model):
+    _inherit = 'res.partner'
+
+    purchase_warn = fields.Selection(track_visibility='onchange')
+
+    # Fix an access right issue when accessing partner form without being
+    # a member of the purchase/User group
+    @api.multi
+    def _purchase_invoice_count(self):
+        poo = self.env['purchase.order']
+        aio = self.env['account.invoice']
+        for partner in self:
+            try:
+                partner.purchase_order_count = poo.search_count(
+                    [('partner_id', 'child_of', partner.id)])
+            except:
+                pass
+            try:
+                partner.supplier_invoice_count = aio.search_count([
+                    ('partner_id', 'child_of', partner.id),
+                    ('type', '=', 'in_invoice')])
+            except:
+                pass