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When a message is written in the chat of an opportunity, support ticket, etc. an email is sent to the followers and if desired to the customer. In my company I was asked that these emails automatically include the customer's name in the subject line.

For this I first created the field 'x_cliente_partner_id' (it is a read only field) in 'mail.message' using the odoo interface, this is a computed field that always brings the client name, I attach the code that calculates the value of the field (depends on the fields 'res_id' and 'model').

for message in self:
    if message.res_id:
        modelo = message.model
        lead = self.env[modelo].browse(message.res_id)
        message.write({
            'x_cliente_partner_id': lead.partner_id.name
        })

Already with the field created, I edited the odoo code so that the subject of the email includes the value of 'x_cliente_partner_id' and so the emails of the messages written in the chat include the name of the client. However I have the problem that when directly modifying a native odoo module whenever someone updates the repository this code modification is lost and I have to rewrite it.

The modification was done in the following location: 'src/odoo/addons/mail/models/mail_thread.py' changing the value of the variable 'mail_subject ' in the following function (I don't put it complete because the function has 154 lines and the change is only in one line):


def _notify_record_by_email(self, message, recipients_data, 									​ msg_vals=False, model_description=False, 							​ mail_auto_delete=True, check_existing=False, 						​   force_send=True, send_after_commit=True, 							​ **kwargs):
        """ Method to send email linked to notified messages.

        :param message: mail.message record to notify;
        :param recipients_data: see ``_notify_thread``;
        :param msg_vals: see ``_notify_thread``;

        :param model_description: model description used in email notification process
          (computed if not given);
        :param mail_auto_delete: delete notification emails once sent;
        :param check_existing: check for existing notifications to update based on
          mailed recipient, otherwise create new notifications;

        :param force_send: send emails directly instead of using queue;
        :param send_after_commit: if force_send, tells whether to send emails after
          the transaction has been committed using a post-commit hook;
        """
        partners_data = [r for r in recipients_data if r['notif'] == 'email']
        if not partners_data:
            return True

        model = msg_vals.get('model') if msg_vals else message.model
        model_name = model_description or (self._fallback_lang().env['ir.model']._get(model).display_name if model else False) # one query for display name
        recipients_groups_data = self._notify_classify_recipients(partners_data, model_name, msg_vals=msg_vals)

        if not recipients_groups_data:
            return True
        force_send = self.env.context.get('mail_notify_force_send', force_send)

        template_values = self._notify_prepare_template_context(message, msg_vals, model_description=model_description) # 10 queries

        email_layout_xmlid = msg_vals.get('email_layout_xmlid') if msg_vals else message.email_layout_xmlid
        template_xmlid = email_layout_xmlid if email_layout_xmlid else 'mail.message_notification_email'
        try:
            base_template = self.env.ref(template_xmlid, raise_if_not_found=True).with_context(lang=template_values['lang']) # 1 query
        except ValueError:
            _logger.warning('QWeb template %s not found when sending notification emails. Sending without layouting.' % (template_xmlid))
            base_template = False

​#New Value of the variable including the name of the client in the subject of the email
        mail_subject = 'Re: %s - Cliente: %s' % (message.record_name, message.x_cliente_partner_id)

#​Original Value of the variable without the name of the client
        #mail_subject = message.subject or (message.record_name and 'Re: %s' % message.record_name) # in cache, no queries

        # Replace new lines by spaces to conform to email headers requirements
        mail_subject = ' '.join((mail_subject or '').splitlines())


I need to know how I can update the repository to keep this modification or if I need to change the value of the variable in another way to avoid losing it with each git update.

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