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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
))
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