[FIX] loyalty: fix missing loyalty product update issue

If applied, this commit will solve the issue of missing product issue while
installing the following modules: loyalty_delivery, pos_loyalty, sale_loyalty,
website_sale_loyalty

Steps to produce:
- Install loyalty module.
- Go to 'Products' or 'Product Variants'.
- Delete the product 'Gift Card'.
- Now install the 'sale_loyalty' module.

This commit will raise an userError while deleting the loyalty products.

sentry - 4112536971

closes odoo/odoo#121484

X-original-commit: 3488d292b514bbf4190f19bd8271b3e68b3eb055
Signed-off-by: Parth Solanki (paso) <paso@odoo.com>

addons/loyalty/i18n/loyalty.pot

@@ -1770,6 +1770,16 @@ msgstr ""
 msgid "You can not delete a program in an active state"
 msgstr ""
 
+#. module: loyalty
+#. odoo-python
+#: code:addons/loyalty/models/product_product.py:0
+#: code:addons/loyalty/models/product_template.py:0
+#, python-format
+msgid ""
+"You cannot delete %(name)s as it is used in 'Coupons & Loyalty'. Please "
+"archive it instead."
+msgstr ""
+
 #. module: loyalty
 #: model:mail.template,subject:loyalty.mail_template_gift_card
 msgid "Your Gift Card at {{ object.company_id.name }}"

addons/loyalty/models/__init__.py

@@ -7,4 +7,5 @@ from . import loyalty_reward
 from . import loyalty_rule
 from . import loyalty_program
 from . import product_product
+from . import product_template
 from . import res_partner

addons/loyalty/models/product_product.py

@@ -1,8 +1,9 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import _, models
-from odoo.exceptions import ValidationError
+from odoo import _, api, models
+from odoo.exceptions import UserError, ValidationError
+
 
 class ProductProduct(models.Model):
     _inherit = 'product.product'
@@ -14,3 +15,16 @@ class ProductProduct(models.Model):
             if rewards:
                 raise ValidationError(_("This product may not be archived. It is being used for an active promotion program."))
         return super().write(vals)
+
+    @api.ondelete(at_uninstall=False)
+    def _unlink_except_loyalty_products(self):
+        product_data = [
+            self.env.ref('loyalty.gift_card_product_50', False),
+            self.env.ref('loyalty.ewallet_product_50', False),
+        ]
+        for product in self.filtered(lambda p: p in product_data):
+            raise UserError(_(
+                "You cannot delete %(name)s as it is used in 'Coupons & Loyalty'."
+                " Please archive it instead.",
+                name=product.name
+            ))

addons/loyalty/models/product_template.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import _, api, models
+from odoo.exceptions import UserError
+
+
+class ProductTemplate(models.Model):
+    _inherit = 'product.template'
+
+    @api.ondelete(at_uninstall=False)
+    def _unlink_except_loyalty_products(self):
+        product_data = [
+            self.env.ref('loyalty.gift_card_product_50', False),
+            self.env.ref('loyalty.ewallet_product_50', False),
+        ]
+        for product in self.filtered(lambda p: p.product_variant_id in product_data):
+            raise UserError(_(
+                "You cannot delete %(name)s as it is used in 'Coupons & Loyalty'."
+                " Please archive it instead.",
+                name=product.name
+            ))