[ADD] pos_second_uom: create custom module for adding second UOM in product

pos_second_uom/__init__.py

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+from . import models

pos_second_uom/__manifest__.py

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+{
+    "name": "POS second UOM",
+    "version": "1.0",
+    "depends": ["base", "point_of_sale", "web"],
+    "category": "Sales/Point of Sale",
+    "data": ["views/product_view.xml"],
+    "assets": {
+        "point_of_sale._assets_pos": [
+            "pos_second_uom/static/src/**/",
+        ],
+    },
+    "sequence": 1,
+    "application": True,
+    "license": "OEEL-1",
+}

pos_second_uom/models/__init__.py

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+from . import product_template

pos_second_uom/models/product_template.py

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+from odoo import fields, models
+
+
+class ProductTemplate(models.Model):
+    _inherit = "product.template"
+
+    uom_category_id = fields.Many2one(
+        related="uom_id.category_id", string="UOM Category", readonly=True, store=True
+    )
+
+    pos_second_uom_id = fields.Many2one(
+        comodel_name="uom.uom",
+        string="POS second UOM",
+        domain="[('category_id', '=', uom_category_id)]",
+        store=True,
+    )

pos_second_uom/static/src/add_quantity_button/add_quantity_button.js

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+import { Component } from "@odoo/owl"
+import { useService } from "@web/core/utils/hooks";
+import { AddQuantityDialog } from "../add_quantity_dialog/add_quantity_dialog";
+
+
+export class AddQuantityButton extends Component {
+    static template = "pos_second_uom.AddQuantityButton"
+
+    setup() {
+        super.setup();
+        this.dialogService = useService("dialog");
+    }
+
+    onClick() {
+        this.dialogService.add(AddQuantityDialog)
+    }
+}

pos_second_uom/static/src/add_quantity_button/add_quantity_button.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates id="pos_add_quantity_button" xml:space="preserve">
+    <t t-name="pos_second_uom.AddQuantityButton">
+        <button class="set-partner btn btn-light btn-lg lh-lg text-truncate w-auto" t-on-click="onClick">
+            Add Quantity
+        </button>
+    </t>
+</templates>

pos_second_uom/static/src/add_quantity_dialog/add_quantity_dialog.js

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+/** @odoo-module **/
+
+import { Component, useRef } from "@odoo/owl";
+import { Dialog } from "@web/core/dialog/dialog";
+import { usePos } from "@point_of_sale/app/store/pos_hook";
+
+export class AddQuantityDialog extends Component {
+    static template = "pos_second_uom.AddQuantityDialog";
+
+    static components = { Dialog };
+
+    static props = {
+        close: { type: Function }
+    };
+
+    setup() {
+        this.pos = usePos()
+        this.quantityInputRef = useRef("quantityInput");
+    }
+
+    confirm() {
+        const quantity = this.quantityInputRef.el.value;
+        const order = this.pos.get_order();
+        const selectedOrderline = order.get_selected_orderline();
+        const product = selectedOrderline.get_product();
+        const originalUOM = product.uom_id.category_id.uom_ids[0];
+        const secondUOM = product.uom_id.category_id.uom_ids[1];
+        const convertedQuantity = quantity * (secondUOM.factor_inv / originalUOM.factor);
+        selectedOrderline.set_quantity(convertedQuantity);
+        this.props.close();
+    }
+
+    cancel() {
+        this.props.close();
+    }
+}

pos_second_uom/static/src/add_quantity_dialog/add_quantity_dialog.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates id="pos_add_quantity_dialog" xml:space="preserve">
+    <t t-name="pos_second_uom.AddQuantityDialog">
+        <Dialog title="'Add Quantity'" size="'md'">
+            <main class="modal-body p-4">
+                <div>
+                    <label for="quantityInput" class="form-label mb-2">Quantity:</label>
+                    <input type="number" id="quantityInput" class="form-control" value="1" min="1" t-ref="quantityInput"/>
+                </div>
+            </main>
+            <t t-set-slot="footer">
+                <button type="button" class="btn btn-secondary me-2" t-on-click="cancel">Cancel</button>
+                <button type="button" class="btn btn-primary" t-on-click="confirm">Confirm</button>
+            </t>
+        </Dialog>
+    </t>
+</templates>

pos_second_uom/static/src/control_buttons/control_buttons.js

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+import { patch } from "@web/core/utils/patch";
+import { ControlButtons } from "@point_of_sale/app/screens/product_screen/control_buttons/control_buttons";
+import { AddQuantityButton } from "../add_quantity_button/add_quantity_button";
+
+patch(ControlButtons, {
+    setup() {
+        super.setup();
+    },
+    components: {
+        ...ControlButtons.components,
+        AddQuantityButton,
+    },
+});

pos_second_uom/static/src/control_buttons/control_buttons.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates id="pos_add_quantity_button" xml:space="preserve">
+    <t t-name="pos_second_uom.AddQuantityButton" t-inherit="point_of_sale.ControlButtons" t-inherit-mode="extension">
+        <xpath expr="//button[hasclass('flex-shrink-0')]" position="before">
+            <AddQuantityButton/>
+        </xpath>
+    </t>
+</templates>

pos_second_uom/views/product_view.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="product_template_form_view_inherit" model="ir.ui.view">
+        <field name="name">product.template.form.inherit</field>
+        <field name="model">product.template</field>
+        <field name="inherit_id" ref="product.product_template_form_view" />
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='pos_categ_ids']" position="after">
+                <field name="uom_category_id" invisible="1" />
+                <field name="pos_second_uom_id" />
+            </xpath>
+        </field>
+    </record>
+</odoo>