pos/pos_invoicing/models/account_invoice.py

# Copyright (C) 2018 - Today: GRAP (http://www.grap.coop)
# @author: Julien WESTE
# @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 AccountInvoice(models.Model):
    _inherit = 'account.invoice'

    pos_pending_payment = fields.Boolean(
        string='PoS - Pending Payment', readonly=True,
        oldname='forbid_payment',
        help="Indicates an invoice for which there are pending payments in the"
        " Point of Sale. \nThe invoice will be marked as paid when the session"
        " will be closed.")

    # Overload Section
    @api.multi
    def action_cancel(self):
        self._check_pos_pending_payment()
        return super(AccountInvoice, self).action_cancel()

    @api.multi
    def _get_outstanding_info_JSON(self):
        self.ensure_one()
        if self.pos_pending_payment:
            return
        else:
            return super()._get_outstanding_info_JSON()

    @api.multi
    def _check_pos_pending_payment(self):
        invoices = self.filtered(lambda x: x.pos_pending_payment)
        if invoices:
            raise UserError(_(
                "You can not realize this action on the invoice(s) %s because"
                " there are pending payments in the Point of Sale.") % (
                    ', '.join(invoices.mapped('name'))))