server-tools/base_global_discount/models/global_discount.py

# Copyright 2019 Tecnativa - David Vidal
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
from odoo import fields, models


class GlobalDiscount(models.Model):
    _name = "global.discount"
    _description = "Global Discount"
    _order = "sequence, id desc"

    sequence = fields.Integer(help="Gives the order to apply discounts")
    name = fields.Char(string="Discount Name", required=True)
    discount = fields.Float(digits="Discount", required=True, default=0.0)
    discount_scope = fields.Selection(
        selection=[("sale", "Sales"), ("purchase", "Purchases")],
        default="sale",
        required="True",
        string="Discount Scope",
    )
    company_id = fields.Many2one(
        comodel_name="res.company",
        string="Company",
        default=lambda self: self.env.company,
    )

    def name_get(self):
        result = []
        for one in self:
            result.append((one.id, "{} ({:.2f}%)".format(one.name, one.discount)))
        return result

    def _get_global_discount_vals(self, base, **kwargs):
        """Prepare the dict of values to create to obtain the discounted
         amount

        :param float base: the amount to discount
        :return: dict with the discounted amount
        """
        self.ensure_one()
        return {
            "global_discount": self,
            "base": base,
            "base_discounted": base * (1 - (self.discount / 100)),
        }