social/mass_mailing_resend/models/mailing_mailing.py

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# Copyright 2017-2020 Tecnativa - Pedro M. Baeza
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
from odoo import _, exceptions, models
class MailingMailing(models.Model):
_inherit = "mailing.mailing"
def button_draft(self):
"""Return to draft state for resending the mass mailing."""
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if any(self.mapped(lambda x: x.state != "done")):
raise exceptions.UserError(
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_(
"You can't resend a mass mailing that is being sent or in "
"draft state."
)
)
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self.write({"state": "draft"})