[ADD] sale_multi_template_application: allow applying multiple templa…

…tes to a sale order

This module enables applying multiple quotation templates to the same sales order.
When a new template is selected, the order lines from the previous templates are retained and not deleted.
For consistency, the template field is emptied for not keeping the order linked to a possible partial template.

sale_multi_template_application/README.rst

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+===============================
+Sale multi template application
+===============================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! source digest: sha256:333fe55af0b7c235786aba0f66d75dfd763960781b34f0701bf3548783f2793e
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |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%2Fsale--workflow-lightgray.png?logo=github
+    :target: https://github.com/OCA/sale-workflow/tree/17.0/sale_multi_template_application
+    :alt: OCA/sale-workflow
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/sale-workflow-17-0/sale-workflow-17-0-sale_multi_template_application
+    :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/sale-workflow&target_branch=17.0
+    :alt: Try me on Runboat
+
+|badge1| |badge2| |badge3| |badge4| |badge5|
+
+This module allows multiple templates to be applied to the same sales
+order, keeping the existing order lines without deleting the previous
+ones.
+
+For consistency, the template field is emptied for not keeping the order
+linked to a possible partial template.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Configuration
+=============
+
+-  Go to *Sales > Configuration > Quotation Templates*.
+-  Create at least two quotation templates and add some lines to each
+   template.
+
+Usage
+=====
+
+-  Go to *Sales > Orders > Quotations*.
+-  Create a new sales order.
+-  Select the first quotation template.
+-  Select the second quotation template, and the order lines from the
+   first template are retained.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/sale-workflow/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/sale-workflow/issues/new?body=module:%20sale_multi_template_application%0Aversion:%2017.0%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
+-------
+
+* Tecnativa
+
+Contributors
+------------
+
+-  `Tecnativa <https://www.tecnativa.com>`__:
+
+   -  Pedro M. Baeza
+   -  Carlos López
+
+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/sale-workflow <https://github.com/OCA/sale-workflow/tree/17.0/sale_multi_template_application>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

sale_multi_template_application/__init__.py

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+from . import models

sale_multi_template_application/__manifest__.py

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+# Copyright 2024 Tecnativa - Carlos López
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+{
+    "name": "Sale multi template application",
+    "version": "17.0.1.0.0",
+    "author": "Tecnativa,Odoo Community Association (OCA)",
+    "website": "https://github.com/OCA/sale-workflow",
+    "category": "Sales",
+    "depends": [
+        "sale_management",
+    ],
+    "installable": True,
+    "license": "AGPL-3",
+}

sale_multi_template_application/models/__init__.py

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+from . import sale_order

sale_multi_template_application/models/sale_order.py

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+# Copyright 2024 Tecnativa - Carlos López
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+
+from odoo import api, models
+
+
+class SaleOrder(models.Model):
+    _inherit = "sale.order"
+
+    @api.onchange("sale_order_template_id")
+    def _onchange_sale_order_template_id(self):
+        # We need to keep the old lines, to restore them after the template change
+        current_lines = self.order_line
+        # We need to keep the max sequence
+        # of the lines when changing the template
+        # because odoo set the sequence for the first line to -99
+        max_sequence = max(current_lines.mapped("sequence"), default=10)
+        res = super()._onchange_sale_order_template_id()
+        for line in self.order_line:
+            sequence = 10 if line.sequence == -99 else line.sequence
+            line.sequence = sequence + max_sequence
+        self.order_line += current_lines
+        self.sale_order_template_id = False
+        return res

sale_multi_template_application/pyproject.toml

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

sale_multi_template_application/readme/CONFIGURE.md

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+- Go to *Sales \> Configuration \> Quotation Templates*.
+- Create at least two quotation templates and add some lines to each template.
+

sale_multi_template_application/readme/CONTRIBUTORS.md

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+- [Tecnativa](https://www.tecnativa.com):
+  - Pedro M. Baeza
+  - Carlos López

sale_multi_template_application/readme/DESCRIPTION.md

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+This module allows multiple templates to be applied to the same sales order, keeping the existing order lines without deleting the previous ones.
+
+For consistency, the template field is emptied for not keeping the order linked to a possible partial template.

sale_multi_template_application/readme/USAGE.md

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+- Go to *Sales \> Orders \> Quotations*.
+- Create a new sales order.
+- Select the first quotation template.
+- Select the second quotation template, and the order lines from the first template are retained.