Prevent user product name modification (or translation)

If the user modify or translate the name of the product "Gift Coupon" the system will be no more able to find it.
So, I:
1) Create a field in the sale parameters page (related to a res.company field to be stored) to select the product use in sale order line
2) Use this parameter in the controller
3) Create a migration method for existing database with this module (so just pull the module version on the customer server, restart the server and update the module)

website_coupon/__init__.py

@@ -23,3 +23,16 @@
 
 import models
 import controllers
+from . import wizards
+
+from odoo import SUPERUSER_ID
+from odoo.api import Environment
+
+
+def post_init_hook(cr, registry):
+    env = Environment(cr, SUPERUSER_ID, {})
+    companies = env['res.company'].search([])
+    gift_coupon_product_id = env['product.product'].search(
+        [('default_code', '=', 'gift_coupon')], limit=1)
+    for company in companies:
+        company.gift_coupon_product_id = gift_coupon_product_id

website_coupon/__manifest__.py

@@ -23,7 +23,7 @@
 ##############################################################################
 {
     'name': 'Website Coupon Code',
-    'version': '10.0.2.0.0',
+    'version': '10.0.2.0.1',
     'summary': 'Manage Website Coupon Codes for Products/Categories/All Products & Its Redeem Operations',
     'category': 'Website',
     'author': 'Cybrosys Techno Solutions',
@@ -36,6 +36,7 @@
         'views/gift_voucher.xml',
         'views/applied_coupons.xml',
         'views/templates.xml',
+        'wizards/res_config/sale_config_settings.xml',
         'security/ir.model.access.csv'
     ],
     'images': ['static/description/banner.jpg'],
@@ -43,4 +44,5 @@
     'installable': True,
     'auto_install': False,
     'application': False,
+    "post_init_hook": "post_init_hook",
 }

website_coupon/controllers/main.py

@@ -79,12 +79,12 @@ class WebsiteCoupon(http.Controller):
             voucher_type = coupon.voucher.voucher_type
             voucher_val = coupon.voucher_val
             type = coupon.type
-            coupon_product = request.env['product.product'].sudo().search([('name', '=', 'Gift Coupon')], limit=1)
+            coupon_product = request.env.user.company_id.gift_coupon_product_id
             if coupon_product:
                 order = request.website.sale_get_order(force_create=1)
                 flag_product = False
                 for line in order.order_line:
-                    if line.product_id.name == 'Gift Coupon':
+                    if line.product_id == coupon_product:
                         flag = False
                         break
                 if flag and order.order_line:

website_coupon/data/product_data.xml

@@ -2,6 +2,7 @@
 <odoo noupdate="1">
     <record model="product.product" id="discount_product">
         <field name="name">Gift Coupon</field>
+        <field name="default_code">gift_coupon</field>
     </record>
 
 </odoo>

website_coupon/migrations/10.0.2.0.1/pre-migration.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 Noviat NV
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+import odoo
+
+
+def update_discount_product_value(env):
+    discount_product = env.ref(
+        'website_coupon.discount_product')
+    discount_product.default_code = 'gift_coupon'
+
+
+def migrate(cr, version):
+    if not version:
+        # installation of the module
+        return
+    with odoo.api.Environment.manage():
+        env = odoo.api.Environment(cr, odoo.SUPERUSER_ID, {})
+        update_discount_product_value(env)

website_coupon/models/__init__.py

@@ -21,3 +21,4 @@
 #
 ##############################################################################
 import gift_voucher
+from . import res_company

website_coupon/models/res_company.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 Noviat NV
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import models, fields, api
+
+
+class ResCompany(models.Model):
+    _inherit = 'res.company'
+
+    gift_coupon_product_id = fields.Many2one(
+        comodel_name='product.product',
+        string="Gift coupon",
+        default=lambda self: self.env['product.product'].search(
+            [('default_code', '=', 'gift_coupon')], limit=1),
+    )

website_coupon/wizards/__init__.py

@@ -0,0 +1,5 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 Noviat NV
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import res_config

website_coupon/wizards/res_config/__init__.py

@@ -0,0 +1,5 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 Noviat NV
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import sale_config_settings

website_coupon/wizards/res_config/sale_config_settings.py

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 Noviat NV
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+
+class SaleConfigSettings(models.TransientModel):
+    _inherit = 'sale.config.settings'
+
+    gift_coupon_product_id = fields.Many2one(
+        related='company_id.gift_coupon_product_id', string="Gift coupon")

website_coupon/wizards/res_config/sale_config_settings.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_sales_config_inherit_sale" model="ir.ui.view">
+        <field name="name">sale settings</field>
+        <field name="model">sale.config.settings</field>
+        <field name="inherit_id" ref="sale.view_sales_config"/>
+        <field name="arch" type="xml">
+            <field name="deposit_product_id_setting" position="after">
+                <field name="gift_coupon_product_id"/>
+            </field>
+        </field>
+    </record>
+</odoo>