Merge PR OCA#1225 into 16.0

Signed-off-by rousseldenis

product_template_has_one_variant/README.rst

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+================================
+Product Template Has One Variant
+================================
+
+.. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |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%2Fproduct--attribute-lightgray.png?logo=github
+    :target: https://github.com/OCA/product-attribute/tree/16.0/product_template_has_one_variant
+    :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_template_has_one_variant
+    :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runbot-Try%20me-875A7B.png
+    :target: https://runbot.odoo-community.org/runbot/135/16.0
+    :alt: Try me on Runbot
+
+|badge1| |badge2| |badge3| |badge4| |badge5| 
+
+This module allows to define a product template property 'Has one variant' that
+is True if the product has one product variant and only one.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Usage
+=====
+
+On product template list views, you can filter products that have only one product
+variant ('Has one Variant' filter name).
+
+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 smashing it by providing a detailed and welcomed
+`feedback <https://github.com/OCA/product-attribute/issues/new?body=module:%20product_template_has_one_variant%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
+~~~~~~~
+
+* ACSONE SA/NV
+
+Contributors
+~~~~~~~~~~~~
+
+* Denis Roussel <denis.roussel@acsone.eu>
+
+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-rousseldenis| image:: https://github.com/rousseldenis.png?size=40px
+    :target: https://github.com/rousseldenis
+    :alt: rousseldenis
+
+Current `maintainer <https://odoo-community.org/page/maintainer-role>`__:
+
+|maintainer-rousseldenis| 
+
+This module is part of the `OCA/product-attribute <https://github.com/OCA/product-attribute/tree/16.0/product_template_has_one_variant>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

product_template_has_one_variant/__init__.py

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+from . import models

product_template_has_one_variant/__manifest__.py

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+# Copyright 2022 ACSONE SA/NV
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+{
+    "name": "Product Template Has One Variant",
+    "summary": """
+        Allows to define a field on product template level to determine
+        if it has only one variant""",
+    "version": "16.0.1.0.0",
+    "license": "AGPL-3",
+    "maintainers": ["rousseldenis"],
+    "author": "ACSONE SA/NV,Odoo Community Association (OCA)",
+    "website": "https://github.com/OCA/product-attribute",
+    "depends": ["product"],
+    "data": [
+        "views/product_template.xml",
+    ],
+}

product_template_has_one_variant/models/__init__.py

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+from . import product_template

product_template_has_one_variant/models/product_template.py

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+# Copyright 2022 ACSONE SA/NV
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+
+class ProductTemplate(models.Model):
+
+    _inherit = "product.template"
+
+    has_one_variant = fields.Boolean(
+        compute="_compute_has_one_variant",
+        store=True,
+        index=True,
+    )
+
+    @api.depends("product_variant_ids")
+    def _compute_has_one_variant(self):
+        templates = self.filtered(
+            lambda template: len(template.product_variant_ids) == 1
+        )
+        templates.update({"has_one_variant": True})
+        (self - templates).update(
+            {
+                "has_one_variant": False,
+            }
+        )

product_template_has_one_variant/readme/CONTRIBUTORS.rst

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+* Denis Roussel <denis.roussel@acsone.eu>

product_template_has_one_variant/readme/DESCRIPTION.rst

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+This module allows to define a product template property 'Has one variant' that
+is True if the product has one product variant and only one.

product_template_has_one_variant/readme/USAGE.rst

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+On product template list views, you can filter products that have only one product
+variant ('Has one Variant' filter name).