Merge PR #1724 into 16.0

Signed-off-by pedrobaeza

account_global_discount/README.rst

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+=======================
+Account Global Discount
+=======================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
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+
+.. |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%2Faccount--invoicing-lightgray.png?logo=github
+    :target: https://github.com/OCA/account-invoicing/tree/16.0/account_global_discount
+    :alt: OCA/account-invoicing
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/account-invoicing-16-0/account-invoicing-16-0-account_global_discount
+    :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/account-invoicing&target_branch=16.0
+    :alt: Try me on Runboat
+
+|badge1| |badge2| |badge3| |badge4| |badge5|
+
+Apply global discounts to invoices
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Configuration
+=============
+
+To configure this module, you need to:
+
+#. Go to *Settings > Parameters > Global Discounts*.
+#. Add a new discount percentage.
+#. Choose the discount scope (sales or purchases).
+#. You can also restrict it to a certain company if needed.
+
+You can assign global discounts to partners as well:
+
+#. Go to a partner that is a company.
+#. Go to the *Sales & Purchases* tab.
+#. In section sale, you can set sale discounts.
+#. In section purchase, you can set purchase discounts.
+
+Usage
+=====
+
+To use this module, you need to:
+
+#. Go to *Invoicing > Customers > Invoices*.
+#. Create a new sales invoice, choose a customer with a defined global
+   discount and you will see how the value of the 'Invoice Global Discounts'
+   field is auto-completed with the global discounts defined in the customer
+   (See configuration section in this readme), although you can choose
+   then other global discounts defined in configuration.
+#. Add several invoice lines.
+#. At the bottom of the form you will see how global discounts affect the
+   total values.
+#. Go to the 'Journal Items' tab (if you have permissions for that).
+   There you will see how the tax lines have the discount percentage applied
+   and you will also see the lines that reflect the global discount applied.
+#. In the 'Other info' tab, you can see in the 'Global Discounts' table,
+   the global discounts applied to each of the invoice lines.
+
+Known issues / Roadmap
+======================
+
+* Not all the taxes combination can be compatible with global discounts, as
+  the generated journal items won't be correct for taxes declarations. An error
+  is raised in that cases.
+* Currently, taxes in invoice lines are mandatory with global discounts.
+* No tax tags are populated for the global discount move lines, only `tax_ids`.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/account-invoicing/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/account-invoicing/issues/new?body=module:%20account_global_discount%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
+~~~~~~~
+
+* Tecnativa
+
+Contributors
+~~~~~~~~~~~~
+
+* `Tecnativa <https://www.tecnativa.com>`_
+
+  * Pedro M. Baeza
+  * David Vidal
+  * Carlos Dauden
+  * Rafael Blasco
+  * Ernesto Tejeda
+  * Víctor Martínez
+* Omar Castiñeira <[email protected]>
+
+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/account-invoicing <https://github.com/OCA/account-invoicing/tree/16.0/account_global_discount>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

account_global_discount/__init__.py

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+from . import models
+from . import report
+from .hooks import _pre_init_global_discount_fields

account_global_discount/__manifest__.py

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+# Copyright 2019 Tecnativa S.L. - David Vidal
+# Copyright 2020-2021 Tecnativa - Pedro M. Baeza
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+{
+    "name": "Account Global Discount",
+    "version": "16.0.1.0.0",
+    "category": "Accounting",
+    "author": "Tecnativa, Odoo Community Association (OCA)",
+    "website": "https://github.com/OCA/account-invoicing",
+    "license": "AGPL-3",
+    "depends": ["account", "base_global_discount"],
+    "data": [
+        "security/ir.model.access.csv",
+        "security/security.xml",
+        "views/account_invoice_views.xml",
+        "views/global_discount_views.xml",
+        "views/report_account_invoice.xml",
+    ],
+    "application": False,
+    "installable": True,
+    "pre_init_hook": "_pre_init_global_discount_fields",
+}

account_global_discount/hooks.py

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+from odoo.tools.sql import column_exists
+
+
+def _pre_init_global_discount_fields(cr):
+    if not column_exists(cr, "account_move", "amount_global_discount"):
+        cr.execute(
+            """
+                ALTER TABLE "account_move"
+                ADD COLUMN "amount_global_discount" double precision DEFAULT 0
+            """
+        )
+        cr.execute(
+            """
+        ALTER TABLE "account_move" ALTER COLUMN "amount_global_discount" DROP DEFAULT
+        """
+        )
+    if not column_exists(cr, "account_move", "amount_untaxed_before_global_discounts"):
+        cr.execute(
+            """
+                ALTER TABLE "account_move"
+                ADD COLUMN "amount_untaxed_before_global_discounts" double precision
+            """
+        )
+        cr.execute(
+            """
+        update account_move set amount_untaxed_before_global_discounts = amount_untaxed
+        """
+        )