I'm looking for help in adding custom fields in my custom addon.

My code (mass_mail.py):

from odoo import models, fields, api
from odoo.exceptions import UserError
import time

class MailingMailing(models.Model):
    _inherit = "mailing.mailing"
    max_emails_per_iteration = fields.Integer(string="Max Emails per Iteration", default=10)
    time_interval_between_iterations = fields.Integer(string="Time Interval (seconds)", default=60)

    def send_mail(self):
        # Split the recipients into smaller groups based on max_emails_per_iteration
        recipient_domain = self.mailing_domain
        mailing_model_id = self.mailing_model_id

        # Fetch the recipients based on the domain
        recipients = self.env[self.env["ir.model"].browse(mailing_model_id).model].search([
            ("id", "in", self.env[self.env["ir.model"].browse(mailing_model_id).model].search([]).filtered_domain(recipient_domain).ids)
        ])

        for i in range(0, len(recipients), self.max_emails_per_iteration):
            email_batch = recipients[i:i + self.max_emails_per_iteration]
            self.write({
                "mailing_domain": [
                    ("id", "in", email_batch.ids),
                    ("model_id", "=", mailing_model_id),
                ]
            })
            super(MailingMailing, self).send_mail()
            time.sleep(self.time_interval_between_iterations)

        # Restore the original domain
        self.write({"mailing_domain": [("id", "in", self.env[self.env["ir.model"].browse(mailing_model_id).model].search([]).filtered_domain(recipient_domain).ids)]})

Odoo is not adding new fields. When trying to add those fields in inherited view, it throws me an error:

odoo.exceptions.ValidationError: Error while validating view near:

                    

                        
                        
                        
                        

Field "max_emails_per_iteration" does not exist in model "mailing.mailing"

I have tried to install the addon without inherited view definition, it installs but there are no custom fields in mailing.mailing model added.

System id Odoo 15 Community.

Any help appreciated.