sale_order_line.py

from odoo import models, fields, api
from odoo.exceptions import UserError


class SaleOrderLine(models.Model):
    _inherit = "sale.order.line"

    @api.model
    def create(self, vals):
        sale_order_line = super().create(vals)
        order_id = sale_order_line.order_id.id
        product_type = sale_order_line.product_template_id.detailed_type
        shop_supplies_product = self.env["res.config.settings"].get_values()[
            "shop_supplies_product"
        ]
        shop_supplies_product = self.env["product.template"].browse(
            shop_supplies_product
        )
        shop_supplies_percentage = self.env["res.config.settings"].get_values()[
            "shop_supplies_percentage"
        ]

        if (
            product_type == "service"
            and sale_order_line.product_template_id.id != shop_supplies_product.id
            and shop_supplies_product
        ):
            current_shop_supplies = self.env["sale.order.line"].search(
                [
                    ("order_id", "=", sale_order_line.order_id.id),
                    ("product_template_id", "=", shop_supplies_product.id),
                ],
                limit=1,
            )
            shop_supplies_amount_nt = 0
            if current_shop_supplies:
                shop_supplies_amount_nt = current_shop_supplies.price_unit
                current_shop_supplies.unlink()

            current_shop_supplies_amount_nt = float(sale_order_line.price_subtotal)

            shop_supplies_amount_nt += (
                current_shop_supplies_amount_nt * float(shop_supplies_percentage)
            ) / 100
            order_line_fields = {
                "customer_lead": 0.0,
                "name": shop_supplies_product.name,
                "order_id": order_id,
                "price_unit": shop_supplies_amount_nt,
                "product_uom_qty": 1.0,
                "product_template_id": shop_supplies_product.id,
                "product_id": shop_supplies_product.product_variant_id.id,
            }
            self.env["sale.order.line"].sudo().create(order_line_fields)
        return sale_order_line