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using create_date Automatic fields in odoo

I am follow odoo document and in chapter 9 I want to use Automatic field ( create_date) to compute value of another field this is my model.

 _name = "estate.offer"
_description = "this is work as a offer offered to our real estate model"
_log_access = True
price = fields.Float()
status = fields.Selection(selection=[('accepted', 'Accepted'), ('refused', 'Refused')], copy=False)
partner_id = fields.Many2one("res.partner", string="Partner", required=True)
property_id = fields.Many2one("estate.model", 'offer_id', required=True)
validity = fields.Integer(compute="_inverse_date_deadline", inverse="_compute_date_deadline")
date_deadline = fields.Date(string="Date Deadline", compute="_compute_date_deadline",
                            inverse="_inverse_date_deadline")

api.depends('create_date', 'validity')
def _compute_date_deadline(self):
    for record in self:
        record.date_deadline = record.create_date + datetime.timedelta(days=record.validity)

# problem in this function
api.depends('create_date', 'date_deadline')
def _inverse_date_deadline(self):
    #print('f ddd {5} xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxzxxxxxxxxx')
    for record in self:
        record.validity = (record.date_deadline - record.create_date).days

in the odoo document they give this tip:

Tip: the create_date is only filled in when the record is created, therefore you will need a fallback to prevent crashing at time of creation.



source https://stackoverflow.com/questions/74185814/using-create-date-automatic-fields-in-odoo
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