[ADD] product_compute_template_field_from_variant_helper module

product_compute_template_field_from_variant_helper/README.rst

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+===========================================================
+Products - Compute Technical Fields (template from Variant)
+===========================================================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! source digest: sha256:793102a13b9b92b13fe8e5664ceccb9bf1e36a52d8339ed87d2b9f2bd9dae1d7
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |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-LGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/lgpl-3.0-standalone.html
+    :alt: License: LGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fproduct--attribute-lightgray.png?logo=github
+    :target: https://github.com/OCA/product-attribute/tree/16.0/product_compute_template_field_from_variant_helper
+    :alt: OCA/product-attribute
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/product-attribute-16-0/product-attribute-16-0-product_compute_template_field_from_variant_helper
+    :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/product-attribute&target_branch=16.0
+    :alt: Try me on Runboat
+
+|badge1| |badge2| |badge3| |badge4| |badge5|
+
+This module extends the functionality of product module, introducing a technical helper to define
+easily template fields that are computed from variant values.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Development
+===========
+
+Replace this code:
+
+.. code-block:: python
+
+  class ProductTemplate(models.Model):
+      _inherit = "product.template"
+
+      net_weight = fields.Float(
+          compute="_compute_net_weight",
+          inverse="_inverse_net_weight",
+          store=True,
+      )
+
+      @api.depends("product_variant_ids", "product_variant_ids.net_weight")
+      def _compute_net_weight(self):
+          for template in self:
+              if template.product_variant_count == 1:
+                  template.net_weight = template.product_variant_ids.net_weight
+              else:
+                  template.net_weight = 0.0
+
+      def _inverse_net_weight(self):
+          for template in self:
+              if len(template.product_variant_ids) == 1:
+                  template.product_variant_ids.net_weight = template.net_weight
+
+    def _get_related_fields_variant_template(self):
+        res = super()._get_related_fields_variant_template()
+        res.append("net_weight")
+        return res
+
+By this code:
+
+.. code-block:: python
+
+  class ProductTemplate(models.Model):
+      _inherit = "product.template"
+
+      net_weight = fields.Float(
+          compute=lambda x: x._compute_template_field_from_variant_field("net_weight"),
+          inverse=lambda x: x._set_product_variant_field("net_weight"),
+          store=True,
+      )
+
+    def _get_related_fields_variant_template(self):
+        res = super()._get_related_fields_variant_template()
+        res.append("net_weight")
+        return res
+
+Known issues / Roadmap
+======================
+
+Do not port this module in version 17.0.
+
+(the feature is native since V17.0)
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/product-attribute/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/product-attribute/issues/new?body=module:%20product_compute_template_field_from_variant_helper%0Aversion:%2016.0%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
+~~~~~~~
+
+* Odoo SA
+* GRAP
+
+Contributors
+~~~~~~~~~~~~
+
+* Sylvain LE GAL (https://www.twitter.com/legalsylvain)
+
+* Odoo SA.
+
+The code of this module is a backport of the code of ``product`` module in Odoo Version 18.0 CE.
+
+https://github.com/odoo/odoo/blob/fa0c3d83b7d3bb06d2a23525f4334671574da358/addons/product/models/product_template.py#L264-L303
+
+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.
+
+.. |maintainer-legalsylvain| image:: https://github.com/legalsylvain.png?size=40px
+    :target: https://github.com/legalsylvain
+    :alt: legalsylvain
+
+Current `maintainer <https://odoo-community.org/page/maintainer-role>`__:
+
+|maintainer-legalsylvain| 
+
+This module is part of the `OCA/product-attribute <https://github.com/OCA/product-attribute/tree/16.0/product_compute_template_field_from_variant_helper>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

product_compute_template_field_from_variant_helper/__init__.py

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+from . import models

product_compute_template_field_from_variant_helper/__manifest__.py

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+# Copyright (C) 2025 - Today: GRAP (http://www.grap.coop)
+# @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+{
+    "name": "Products - Compute Technical Fields (template from Variant)",
+    "summary": "Add technical helper to compute easily template fields from"
+    " product variant fields",
+    "version": "16.0.1.0.0",
+    "category": "Product",
+    "author": "Odoo SA,GRAP,Odoo Community Association (OCA)",
+    "maintainers": ["legalsylvain"],
+    "website": "https://github.com/OCA/product-attribute",
+    "license": "LGPL-3",
+    "depends": ["product"],
+    "installable": True,
+}

product_compute_template_field_from_variant_helper/models/__init__.py

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+from . import product_template

product_compute_template_field_from_variant_helper/models/product_template.py

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+# Copyright (C) 2025 - Today: Odoo
+# License LGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+
+from odoo import models
+
+
+class ProductTemplate(models.Model):
+    _inherit = "product.template"
+
+    def _compute_template_field_from_variant_field(self, fname, default=False):
+        """Sets the value of the given field based on the template variant values
+
+        Equals to product_variant_ids[fname] if it's a single variant product.
+        Otherwise, sets the value specified in ``default``.
+        It's used to compute fields like barcode, weight, volume..
+
+        :param str fname: name of the field to compute
+            (field name must be identical between product.product & product.template models)
+        :param default: default value to set when there are multiple or no variants
+        on the template
+        :return: None
+        """
+        for template in self:
+            variant_count = len(template.product_variant_ids)
+            if variant_count == 1:
+                template[fname] = template.product_variant_ids[fname]
+            elif variant_count == 0 and self.env.context.get("active_test", True):
+                # If the product has no active variants, retry without the active_test
+                template_ctx = template.with_context(active_test=False)
+                template_ctx._compute_template_field_from_variant_field(
+                    fname, default=default
+                )
+            else:
+                template[fname] = default
+
+    def _set_product_variant_field(self, fname):
+        """Propagate the value of the given field from the templates to their unique variant.
+
+        Only if it's a single variant product.
+        It's used to set fields like barcode, weight, volume..
+
+        :param str fname: name of the field whose value should be propagated to the variant.
+            (field name must be identical between product.product & product.template models)
+        """
+        for template in self:
+            count = len(template.product_variant_ids)
+            if count == 1:
+                template.product_variant_ids[fname] = template[fname]
+            elif count == 0:
+                archived_variants = self.with_context(
+                    active_test=False
+                ).product_variant_ids
+                if len(archived_variants) == 1:
+                    archived_variants[fname] = template[fname]

product_compute_template_field_from_variant_helper/readme/CONTRIBUTORS.rst

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+* Sylvain LE GAL (https://www.twitter.com/legalsylvain)
+
+* Odoo SA.
+
+The code of this module is a backport of the code of ``product`` module in Odoo Version 18.0 CE.
+
+https://github.com/odoo/odoo/blob/fa0c3d83b7d3bb06d2a23525f4334671574da358/addons/product/models/product_template.py#L264-L303

product_compute_template_field_from_variant_helper/readme/DESCRIPTION.rst

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+This module extends the functionality of product module, introducing a technical helper to define
+easily template fields that are computed from variant values.

product_compute_template_field_from_variant_helper/readme/DEVELOP.rst

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+Replace this code:
+
+.. code-block:: python
+
+  class ProductTemplate(models.Model):
+      _inherit = "product.template"
+
+      net_weight = fields.Float(
+          compute="_compute_net_weight",
+          inverse="_inverse_net_weight",
+          store=True,
+      )
+
+      @api.depends("product_variant_ids", "product_variant_ids.net_weight")
+      def _compute_net_weight(self):
+          for template in self:
+              if template.product_variant_count == 1:
+                  template.net_weight = template.product_variant_ids.net_weight
+              else:
+                  template.net_weight = 0.0
+
+      def _inverse_net_weight(self):
+          for template in self:
+              if len(template.product_variant_ids) == 1:
+                  template.product_variant_ids.net_weight = template.net_weight
+
+    def _get_related_fields_variant_template(self):
+        res = super()._get_related_fields_variant_template()
+        res.append("net_weight")
+        return res
+
+By this code:
+
+.. code-block:: python
+
+  class ProductTemplate(models.Model):
+      _inherit = "product.template"
+
+      net_weight = fields.Float(
+          compute=lambda x: x._compute_template_field_from_variant_field("net_weight"),
+          inverse=lambda x: x._set_product_variant_field("net_weight"),
+          store=True,
+      )
+
+    def _get_related_fields_variant_template(self):
+        res = super()._get_related_fields_variant_template()
+        res.append("net_weight")
+        return res

product_compute_template_field_from_variant_helper/readme/ROADMAP.rst

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+Do not port this module in version 17.0.
+
+(the feature is native since V17.0)