Get value from a Many2one related model in model create function - odoo

Question

I have two models, TextMessage and Device, that are related many TextMessages to one Device.
from odoo import models, fields, api
class Device(models.Model):
_name = 'device'
_description = 'A model for storing all devices'
name = fields.Char()
iden = fields.Char()
model_name = fields.Char()
manufacturer = fields.Char()
push_token = fields.Char()
app_version = fields.Integer()
icon = fields.Char()
has_sms = fields.Char()
text_message_ids = fields.One2many("text_message", "device_id", string="Text Messages")
from odoo import models, fields, api
class TextMessage(models.Model):
_name = 'text_message'
_description = 'Text Messages'
name = fields.Char()
message_text = fields.Text()
pb_response = fields.Text()
target_number = fields.Char()
device_id = fields.Many2one('device', 'Device', required=True)
#api.model
#api.depends("device_id")
def create(self, values):
print("values['device_id']",values["device_id"])
print("self.device_id",self.device_id.iden)
for rec in self.device_id:
print("Device ID",rec.iden)
values['pb_response'] = rec.device_id.iden
return super().create(values)
In the create method of TextMessage, I want to retrieve the value of the iden attribute of the Device model.
The print statements in TextMessage.create print:
values['device_id'] 1
self.device_id False
The print statement in the loop prints nothing.

Answer 1

You can't access self before creating the record so it will be false.
You can write the create method in two ways:
Create the record first and then get the iden value:
#api.model
def create(self, values):
res = super().create(values)
res.pb_response = res.device_id.iden
return res
Or you can get the device_id record from values as below:
#api.model
def create(self, values):
if 'device_id' in values and values.get('device_id',False):
device = self.env['device'].browse(values.get('device_id'))
if device:
values['pb_response'] = device.iden
return super().create(values)
If the pb_response field is the same of the iden field then you can create it as related field to device_id.iden and you will get the iden value automatically once the device-id assigned as below:
pb_response = fields.Char(related="device_id.iden")