[REF] Improvement of the module structure according to OCA's guideline

base_partner_ref/models/__init__.py

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+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import partner

base_partner_ref/models/partner.py

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+# Copyright 2017-2019 Akretion
+# @author: Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+
+class ResPartner(models.Model):
+    _inherit = 'res.partner'
+
+    ref = fields.Char(copy=False)  # To avoid blocking duplicate
+    invalidate_display_name = fields.Boolean()
+
+    _sql_constraints = [(
+        'ref_unique',
+        'unique(ref)',
+        'A partner already exists with this internal reference!'
+        )]
+
+    # add 'ref' in depends
+    @api.depends('is_company', 'name', 'parent_id.name', 'type', 'company_name', 'ref', 'invalidate_display_name')
+    def _compute_display_name(self):
+        super(ResPartner, self)._compute_display_name()
+
+    def _get_name(self):
+        partner = self
+        name = partner.name or ''
+
+        # START modif of native method
+        if partner.ref:
+            name = u"[%s] %s" % (partner.ref, name)
+        # END modif of native method
+        if partner.company_name or partner.parent_id:
+            if not name and partner.type in ['invoice', 'delivery', 'other']:
+                name = dict(self.fields_get(['type'])['type']['selection'])[partner.type]
+            if not partner.is_company:
+                # START modif of native name_get() method
+                company_name = partner.commercial_company_name or partner.parent_id.name
+                if partner.parent_id.ref:
+                    company_name = u"[%s] %s" % (partner.parent_id.ref, company_name)
+                name = "%s, %s" % (company_name, name)
+                # END modif of native name_get() method
+        if self._context.get('show_address_only'):
+            name = partner._display_address(without_company=True)
+        if self._context.get('show_address'):
+            name = name + "\n" + partner._display_address(without_company=True)
+        name = name.replace('\n\n', '\n')
+        name = name.replace('\n\n', '\n')
+        if self._context.get('address_inline'):
+            name = name.replace('\n', ', ')
+        if self._context.get('show_email') and partner.email:
+            name = "%s <%s>" % (name, partner.email)
+        if self._context.get('html_format'):
+            name = name.replace('\n', '<br/>')
+        if self._context.get('show_vat') and partner.vat:
+            name = "%s ‒ %s" % (name, partner.vat)
+        return name