bank-payment/account_banking_mandate/models/res_partner_bank.py

# Copyright 2014 Compassion CH - Cyril Sester <csester@compassion.ch>
# Copyright 2014 Tecnativa - Pedro M. Baeza
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).

from flectra import _, api, fields, models
from flectra.exceptions import ValidationError


class ResPartnerBank(models.Model):
    _inherit = "res.partner.bank"

    mandate_ids = fields.One2many(
        comodel_name="account.banking.mandate",
        inverse_name="partner_bank_id",
        string="Direct Debit Mandates",
        help="Banking mandates represent an authorization that the bank "
        "account owner gives to a company for a specific operation.",
    )

    @api.constrains("company_id")
    def _company_constrains(self):
        for rpb in self:
            if rpb.company_id and (
                self.env["account.banking.mandate"]
                .sudo()
                .search(
                    [
                        ("partner_bank_id", "=", rpb.id),
                        ("company_id", "!=", rpb.company_id.id),
                    ],
                    limit=1,
                )
            ):
                raise ValidationError(
                    _(
                        "You cannot change the company of Partner Bank %s, "
                        "as there exists mandates referencing it that "
                        "belong to another company."
                    )
                    % (rpb.display_name,)
                )