[ADD] rental: Implemented deposit work flow for rental orders

- Added a field in Rental Settings to configure a default deposit
product (rental_product_id).
- Extended product template with require_deposite and deposite_amount fields
 under Rental tab.
- Automatically creates a deposit order line linked to the main rental product
 line when deposit is required.
- Ensures deposit line quantity syncs with the main rental product quantity and
is read only.
- Displayed deposit amount on the product page (website_sale).
- Updated the cart and checkout views to include and properly handle
deposit lines.

Author: mamg-odoo

deposite_in_rental/__init__.py

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+from . import models

deposite_in_rental/__manifest__.py

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+{
+    "name": "deposite_in_rental",
+    "depends": ["base", "account_invoice_extract", "sale_renting", "website_sale"],
+    "data": [
+        "views/res_config_setting_rental_view.xml",
+        "views/product_template_inherit_view.xml",
+        "views/website_rental_inherit.xml",
+        "views/sale_order_line_inherit_view.xml",
+    ],
+    "license": "LGPL-3",
+}

deposite_in_rental/models/__init__.py

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+from . import res_config_settings_inherit
+from . import product_template_inherit
+from . import sale_order_line_rental_inherit

deposite_in_rental/models/product_template_inherit.py

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+from odoo import fields, models
+
+
+class ProductTemplateInherit(models.Model):
+    _inherit = "product.template"
+
+    require_deposite = fields.Boolean(string="Requires Deposite?")
+    deposite_amount = fields.Monetary(string="Deposite Amount")

deposite_in_rental/models/res_config_settings_inherit.py

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+from odoo import api, fields, models
+
+
+class ResConfigSettingInherit(models.TransientModel):
+    _inherit = "res.config.settings"
+
+    rental_product_id = fields.Many2one(
+        "product.product",
+        string="Deposite Product",
+        inverse="_set_rental_product",
+        compute="_get_rental_product",
+    )
+
+    def _set_rental_product(self):
+        self.env["ir.config_parameter"].set_param(
+            "rental.deposite_product", self.rental_product_id.id or ""
+        )
+
+    @api.depends()
+    def _get_rental_product(self):
+        return int(self.env["ir.config_parameter"].get_param("rental.deposite_product"))

deposite_in_rental/models/sale_order_line_rental_inherit.py

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+from odoo import api, models, fields
+
+
+class SaleOrderLineRentalInherit(models.Model):
+    _inherit = "sale.order.line"
+    main_rental_id = fields.Many2one("sale.order.line", ondelete="cascade")
+    child_rental_id = fields.Many2one("sale.order.line", ondelete="cascade")
+
+    @api.model_create_multi
+    def create(self, vals_list):
+        res = super().create(vals_list)
+        deposit_product_id = (
+            self.env["ir.config_parameter"].sudo().get_param("rental.deposite_product")
+        )
+        for line in res:
+            if (
+                deposit_product_id
+                and line.product_template_id.require_deposite
+                and line.product_template_id.deposite_amount
+            ):
+                child_rental_ol = self.env["sale.order.line"].create(
+                    {
+                        "order_id": line.order_id.id,
+                        "product_id": (int)(deposit_product_id),
+                        "name": f"Deposit for {line.product_id.name}",
+                        "product_uom_qty": line.product_uom_qty,
+                        "price_unit": line.product_template_id.deposite_amount,
+                        "main_rental_id": line.id,
+                    }
+                )
+                line.child_rental_id = child_rental_ol.id
+        return res
+
+    def write(self, vals):
+        for line in self:
+            if line.child_rental_id and "product_uom_qty" in vals:
+                qty = vals["product_uom_qty"]
+                line.child_rental_id.write(
+                    {
+                        "product_uom_qty": qty,
+                        "price_unit": line.product_template_id.deposite_amount,
+                    }
+                )
+        return super().write(vals)

deposite_in_rental/views/product_template_inherit_view.xml

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+<?xml version="1.0"?>
+<odoo>
+    <record id="product_template_rental_inherit" model="ir.ui.view">
+        <field name="name">Product.Template.Rental.Inherit</field>
+        <field name="model">product.template</field>
+        <field name="inherit_id" ref="sale_renting.product_template_form_view_rental"/>
+        <field name="arch" type="xml">
+            <xpath expr="//page[@name='pricing']//group[@name='extra_rental']" position="inside">
+                <field name="require_deposite"/>
+                <field name="deposite_amount" invisible="not require_deposite"/>
+            </xpath>
+        </field>
+    </record>
+</odoo>

deposite_in_rental/views/res_config_setting_rental_view.xml

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+<?xml version="1.0"?>
+<odoo>
+    <record id="rental_config_setting_inherit" model="ir.ui.view">
+        <field name="name">Rental config inherit</field>
+        <field name="model">res.config.settings</field>
+        <field name="inherit_id" ref="sale_renting.res_config_settings_view_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//form//setting[@name='rental_delay_costs']//div[hasclass('content-group')]" position='inside'>
+                <div class="row mt2 oe-inline">
+                    <label for="rental_product_id"/>
+                    <field name="rental_product_id"/>
+                </div>
+            </xpath>
+        </field>
+    </record>
+</odoo> 

deposite_in_rental/views/sale_order_line_inherit_view.xml

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+<?xml version="1.0"?>
+<odoo>
+    <record id="sale_order_inherit_view_rental" model="ir.ui.view">
+        <field name="name">Sale.Order.Inherit.View.Rental</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='order_line']//list//field[@name='product_template_id']" position="attributes">
+                <attribute name="readonly">main_rental_id</attribute>
+            </xpath>
+            <xpath expr="//field[@name='order_line']//list//field[@name='product_uom_qty']" position="attributes">
+                <attribute name="readonly">main_rental_id</attribute>
+            </xpath>
+            <xpath expr="//field[@name='order_line']//list//field[@name='price_unit']" position="attributes">
+                <attribute name="readonly">main_rental_id</attribute>
+            </xpath>
+        </field>
+    </record>
+</odoo>

deposite_in_rental/views/website_rental_inherit.xml

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+<?xml version="1.0"?>
+<odoo>
+    <template id="website_product_rental" inherit_id="website_sale.product">
+        <xpath expr="//div[@id='product_detail_main']//div[@id='o_wsale_cta_wrapper']" position="after">
+            <div class="my-2" t-if='product.deposite_amount'>
+                <h4>Deposite Amount: $<t t-esc='product.deposite_amount'/>
+                </h4>
+            </div>
+        </xpath>
+    </template>
+    <template id="website_sale_stock_cart_lines" inherit_id="website_sale.cart_lines" name="Shopping Cart Lines">
+        <xpath expr="//div[@name='website_sale_cart_line_quantity']" position="attributes">
+            <attribute name="t-att-class">'d-none' if line.main_rental_id else ''+('css_quantity input-group mb-2')</attribute>
+        </xpath>
+    </template>
+</odoo>