# This is a combination of 3 commits.

# This is the 1st commit message:

Add module stock_quant_package_product_packaging

# The commit message #2 will be skipped:

# Add tests

# The commit message #3 will be skipped:

# Display single_product fields in debug mode

stock_quant_package_product_packaging/__init__.py

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+from . import models

stock_quant_package_product_packaging/__manifest__.py

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+# Copyright 2019 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+{
+    "name": "Stock Quant Package Product Packaging",
+    "summary": "Use product packagings on packages",
+    "version": "12.0.1.0.0",
+    "development_status": "Alpha",
+    "category": "Warehouse Management",
+    "website": "https://github.com/OCA/stock-logistics-workflow",
+    "author": "Camptocamp, Odoo Community Association (OCA)",
+    "license": "AGPL-3",
+    "application": False,
+    "installable": True,
+    "depends": [
+        "stock",
+    ],
+    "data": [
+        "views/stock_quant_package.xml",
+    ],
+    "demo": [
+    ],
+}

stock_quant_package_product_packaging/models/__init__.py

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+from . import stock_quant_package
+from . import stock_move_line

stock_quant_package_product_packaging/models/stock_move_line.py

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+# Copyright 2019 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+from odoo import models
+
+
+class StockMoveLine(models.Model):
+    _inherit = 'stock.move.line'
+
+    def _action_done(self):
+        res = super()._action_done()
+        for line in self.filtered(lambda l: l.result_package_id):
+            line.result_package_id.auto_assign_packaging()
+        return res

stock_quant_package_product_packaging/models/stock_quant_package.py

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+# Copyright 2019 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+from odoo import api, fields, models
+
+
+class StockQuantPackage(models.Model):
+
+    _inherit = "stock.quant.package"
+
+    # This is not the same thing as 'packaging_id':
+    # * packaging_id is the "Package type", packaging which have
+    #   no 'product_id' and used for the delivery (postal 2kg, ...)
+    # * product_packaging_id is the actual Product Packaging (usually
+    #   using a GTIN) used for the internal logistics/reception. It
+    #   has a product_id
+    product_packaging_id = fields.Many2one(
+        'product.packaging',
+        'Product Packaging',
+        index=True,
+        help="Packaging of the product, used for internal logistics"
+        "transfers, put-away rules, ..."
+    )
+    single_product_id = fields.Many2one(
+        'product.product', compute='_compute_single_product'
+    )
+    single_product_qty = fields.Float(compute='_compute_single_product')
+
+    @api.depends('quant_ids', 'quant_ids.product_id')
+    def _compute_single_product(self):
+        for pack in self:
+            pack_products = pack.quant_ids.mapped('product_id')
+            if len(pack_products) == 1:
+                pack.single_product_id = pack_products.id
+                # TODO handle uom
+                pack.single_product_qty = sum(pack.quant_ids.mapped('quantity'))
+            else:
+                pack.single_product_id = False
+                pack.single_product_qty = 0
+
+    def auto_assign_packaging(self):
+        for pack in self:
+            if (
+                not pack.product_packaging_id
+                and pack.single_product_id
+                and pack.single_product_qty
+            ):
+                packaging = self.env['product.packaging'].search(
+                    [
+                        ('product_id', '=', pack.single_product_id.id),
+                        ('qty', '=', pack.single_product_qty)
+                    ], limit=1
+                )
+                if packaging:
+                    pack.write({'product_packaging_id': packaging.id})

stock_quant_package_product_packaging/readme/CONTRIBUTORS.rst

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+* Akim Juillerat <akim.juillerat@camptocamp.com>

stock_quant_package_product_packaging/readme/DESCRIPTION.rst

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+This module allows to define on a Product Package (`stock.quant.package`), a
+Packaging Type (`product.packaging`) that is linked to a product, if said
+package only contains Quants (`stock.quants`) from this product, and the sum of
+the quants quantities is equal to the Packaging quantity.
+
+If such a packaging exists, it will be automatically assigned to a package after
+the move is set to done.

stock_quant_package_product_packaging/tests/__init__.py

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+from . import test_stock_quant_package_product_packaging

stock_quant_package_product_packaging/tests/test_stock_quant_package_product_packaging.py

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+# Copyright 2020 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+from odoo.tests import SavepointCase
+
+
+class TestStockQuantPackageProductPackaging(SavepointCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.receipt_picking_type = cls.env.ref("stock.picking_type_in")
+        # show_reserved must be set here because it changes the behaviour of
+        # put_in_pack operation:
+        # if show_reserved: qty_done must be set on stock.picking.move_line_ids
+        # if not show_reserved: qty_done must be set on
+        #   stock.picking.move_line_nosuggest_ids
+        cls.receipt_picking_type.show_reserved = True
+        cls.product = cls.env.ref("product.product_delivery_02")
+        cls.packaging = cls.env["product.packaging"].create(
+            {"name": "10 pack", "product_id": cls.product.id, "qty": 10}
+        )
+
+    def test_auto_assign_packaging(self):
+        location_dest = self.receipt_picking_type.default_location_dest_id
+        picking = self.env["stock.picking"].create(
+            {
+                "picking_type_id": self.receipt_picking_type.id,
+                "location_id": self.env.ref("stock.stock_location_suppliers").id,
+                "location_dest_id": location_dest.id,
+            }
+        )
+        picking.onchange_picking_type()
+        picking.write(
+            {
+                "move_lines": [
+                    (
+                        0,
+                        0,
+                        {
+                            "name": "TEST",
+                            "product_id": self.product.id,
+                            "product_uom_qty": 30.0,
+                            "product_uom": self.product.uom_id.id,
+                            "location_id": picking.location_id.id,
+                            "location_dest_id": picking.location_dest_id.id,
+                        },
+                    )
+                ]
+            }
+        )
+        picking.action_confirm()
+        picking.move_line_ids.qty_done = 10.0
+        first_package = picking.put_in_pack()
+        picking.move_line_ids.filtered(
+            lambda ml: not ml.result_package_id
+        ).qty_done = 20.0
+        second_package = picking.put_in_pack()
+        picking.button_validate()
+        self.assertEqual(first_package.single_product_id, self.product)
+        self.assertEqual(first_package.single_product_qty, 10.0)
+        self.assertEqual(second_package.single_product_id, self.product)
+        self.assertEqual(second_package.single_product_qty, 20.0)
+        self.assertEqual(first_package.product_packaging_id, self.packaging)
+        self.assertFalse(second_package.product_packaging_id)

stock_quant_package_product_packaging/views/stock_quant_package.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="view_quant_package_form_inherit" model="ir.ui.view">
+        <field name="name">stock.quant.package.form.inherit</field>
+        <field name="model">stock.quant.package</field>
+        <field name="inherit_id" ref="stock.view_quant_package_form"/>
+        <field name="arch" type="xml">
+            <field name="company_id" position="before">
+                <field name="single_product_id" groups="base.group_no_one" />
+                <field name="single_product_qty" groups="base.group_no_one" />
+                <field name="product_packaging_id"
+                       domain="[('product_id', '=', single_product_id), ('qty', '=', single_product_qty)]"/>
+            </field>
+        </field>
+    </record>
+</odoo>