init common and customize

app_common/models/res_partner.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models, tools,  _
+
+
+class ResPartner(models.Model):
+    _inherit = 'res.partner'
+
+    def get_related_user_id(self):
+        self.ensure_one()
+        user = self.env['res.users'].sudo().with_context(active_test=False).search([('partner_id', '=', self.id)], limit=1)
+        if not user and self.commercial_partner_id:
+            user = self.env['res.users'].sudo().with_context(active_test=False).search([('partner_id', '=', self.commercial_partner_id.id)],
+                                                                                       limit=1)
+        return user