social/mass_mailing_partner/models/mailing_contact_subscription.py

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# Copyright 2018 Tecnativa - Ernesto Tejeda
# Copyright 2020 Tecnativa - Manuel Calero
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
from odoo import _, api, models
from odoo.exceptions import ValidationError
class MailingContactSubscription(models.Model):
_inherit = "mailing.contact.subscription"
@api.constrains("contact_id", "list_id")
def _check_contact_id_partner_id_list_id(self):
for rel in self:
if rel.contact_id.partner_id:
contacts = rel.list_id.contact_ids - rel.contact_id
if rel.contact_id.partner_id in contacts.mapped("partner_id"):
raise ValidationError(
_("A partner cannot be multiple times in the same list")
)