[18.0][ADD] website_sale_carrier_auto_assign: glue module to prevent duplic…

website_sale_carrier_auto_assign/README.rst

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+================================
+Website Sale Carrier Auto Assign
+================================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! source digest: sha256:a9b46f72bc3da4b07f6f3b421bb0d4aa16cec7073c5f7059c3f8313a6a024168
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
+    :target: https://odoo-community.org/page/development-status
+    :alt: Beta
+.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fe--commerce-lightgray.png?logo=github
+    :target: https://github.com/OCA/e-commerce/tree/18.0/website_sale_carrier_auto_assign
+    :alt: OCA/e-commerce
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/e-commerce-18-0/e-commerce-18-0-website_sale_carrier_auto_assign
+    :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runboat-Try%20me-875A7B.png
+    :target: https://runboat.odoo-community.org/builds?repo=OCA/e-commerce&target_branch=18.0
+    :alt: Try me on Runboat
+
+|badge1| |badge2| |badge3| |badge4| |badge5|
+
+This module is a glue between
+`website_sale <https://github.com/odoo/odoo/tree/18.0/addons/website_sale>`__
+and
+`sale_order_carrier_auto_assign <https://github.com/OCA/sale-workflow/tree/18.0/sale_order_carrier_auto_assign>`__.
+
+When ``sale_order_carrier_auto_assign`` is installed with
+``carrier_on_create`` enabled and a shipping partner has
+``property_delivery_carrier_id`` set, its ``create``/``write`` overrides
+automatically add a delivery line from the partner's default carrier. On
+website orders, ``website_sale`` already handles carrier selection via
+``_get_preferred_delivery_method`` (which reads
+``property_delivery_carrier_id``) and ``_set_delivery_method`` (which
+removes any existing delivery line before adding the new one). Letting
+both mechanisms run in parallel creates two delivery lines, causing a
+``ValueError: Expected singleton`` crash in ``order_2_return_dict`` at
+checkout confirmation.
+
+This module prevents the OCA auto-assign from running on website orders
+(``website_id`` is set) so that ``website_sale`` remains the sole owner
+of delivery-line management for e-commerce carts.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/e-commerce/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us to smash it by providing a detailed and welcomed
+`feedback <https://github.com/OCA/e-commerce/issues/new?body=module:%20website_sale_carrier_auto_assign%0Aversion:%2018.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+-------
+
+* ADHOC SA
+
+Maintainers
+-----------
+
+This module is maintained by the OCA.
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+This module is part of the `OCA/e-commerce <https://github.com/OCA/e-commerce/tree/18.0/website_sale_carrier_auto_assign>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

website_sale_carrier_auto_assign/__init__.py

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

website_sale_carrier_auto_assign/__manifest__.py

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+# Copyright 2026 ADHOC SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+{
+    "name": "Website Sale Carrier Auto Assign",
+    "summary": "Prevent duplicate delivery lines on website orders when "
+    "sale_order_carrier_auto_assign is installed.",
+    "version": "18.0.1.0.0",
+    "development_status": "Beta",
+    "category": "Website",
+    "website": "https://github.com/OCA/e-commerce",
+    "author": "ADHOC SA, Odoo Community Association (OCA)",
+    "license": "AGPL-3",
+    "depends": ["website_sale", "sale_order_carrier_auto_assign"],
+    "auto_install": True,
+}

website_sale_carrier_auto_assign/models/__init__.py

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

website_sale_carrier_auto_assign/models/sale_order.py

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+# Copyright 2026 ADHOC SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import models
+
+
+class SaleOrder(models.Model):
+    _inherit = "sale.order"
+
+    def _is_auto_set_carrier_on_create(self):
+        self.ensure_one()
+        if self.website_id:
+            return False
+        return super()._is_auto_set_carrier_on_create()

website_sale_carrier_auto_assign/pyproject.toml

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+[build-system]
+requires = ["whool"]
+build-backend = "whool.buildapi"

website_sale_carrier_auto_assign/readme/DESCRIPTION.md

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+This module is a glue between
+[website_sale](https://github.com/odoo/odoo/tree/18.0/addons/website_sale)
+and
+[sale_order_carrier_auto_assign](https://github.com/OCA/sale-workflow/tree/18.0/sale_order_carrier_auto_assign).
+
+When `sale_order_carrier_auto_assign` is installed with `carrier_on_create`
+enabled and a shipping partner has `property_delivery_carrier_id` set, its
+`create`/`write` overrides automatically add a delivery line from the partner's
+default carrier. On website orders, `website_sale` already handles carrier
+selection via `_get_preferred_delivery_method` (which reads
+`property_delivery_carrier_id`) and `_set_delivery_method` (which removes any
+existing delivery line before adding the new one). Letting both mechanisms run
+in parallel creates two delivery lines, causing a
+`ValueError: Expected singleton` crash in `order_2_return_dict` at checkout
+confirmation.
+
+This module prevents the OCA auto-assign from running on website orders
+(`website_id` is set) so that `website_sale` remains the sole owner of
+delivery-line management for e-commerce carts.