from odoo import _, api, models, exceptions


class UtmSource(models.Model):
    _inherit = 'utm.source'

    @api.ondelete(at_uninstall=False)
    def _unlink_except_utm_source_marketing_card(self):
        utm_source_marketing_card = self.env.ref('marketing_card.utm_source_marketing_card', raise_if_not_found=False)
        if utm_source_marketing_card and utm_source_marketing_card in self:
            raise exceptions.UserError(_(
                "The UTM source '%s' cannot be deleted as it is used to promote marketing cards campaigns.",
                utm_source_marketing_card.name
            ))