pos/pos_payment_change/wizards/pos_payment_change_wizard.py

# Copyright (C) 2015-Today GRAP (http://www.grap.coop)
# @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from odoo import _, api, fields, models
from odoo.exceptions import Warning as UserError


class PosPaymentChangeWizard(models.TransientModel):
    _name = "pos.payment.change.wizard"
    _description = "PoS Payment Change Wizard"

    # Column Section
    order_id = fields.Many2one(
        comodel_name="pos.order", string="Order", readonly=True
    )

    line_ids = fields.One2many(
        comodel_name="pos.payment.change.wizard.line",
        inverse_name="wizard_id",
        string="Payment Lines",
    )

    amount_total = fields.Float(string="Total", readonly=True)

    # View Section
    @api.model
    def default_get(self, fields):
        PosOrder = self.env["pos.order"]
        res = super().default_get(fields)
        order = PosOrder.browse(self._context.get("active_id"))
        res.update({"order_id": order.id})
        res.update({"amount_total": order.amount_total})
        return res

    # View section
    @api.multi
    def button_change_payment(self):
        self.ensure_one()
        order = self.order_id

        # Check if the total is correct
        total = 0
        for line in self.line_ids:
            total += line.amount
        if total != self.amount_total:
            raise UserError(
                _(
                    "Differences between the two values for the POS"
                    " Order '%s':\n\n"
                    " * Total of all the new payments %s;\n"
                    " * Total of the POS Order %s;\n\n"
                    "Please change the payments."
                    % (order.name, total, order.amount_total)
                )
            )

        # Change payment
        new_payments = [{
            "journal": line.new_journal_id.id,
            "amount": line.amount,
            "payment_date": fields.Date.context_today(self),
        } for line in self.line_ids]

        orders = order.change_payment(new_payments)

        if len(orders) == 1:
            # if policy is 'update', only close the pop up
            action = {'type': 'ir.actions.act_window_close'}
        else:
            # otherwise (refund policy), displays the 3 orders
            action = self.env.ref(
                "point_of_sale.action_pos_pos_form"
            ).read()[0]
            action['domain'] = [('id', 'in', orders.ids)]

        return action