Mixins and Useful Classes — Odoo 14.0 documentation

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Sun Jan 16 2022 15:08:41 GMT+0000 (Coordinated Universal Time)

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class BusinessTrip(models.Model):
    _name = 'business.trip'
    _inherit = ['mail.thread']
    _description = 'Business Trip'

    name = fields.Char(tracking=True)
    partner_id = fields.Many2one('res.partner', 'Responsible',
                                 tracking=True)
    guest_ids = fields.Many2many('res.partner', 'Participants')
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https://www.odoo.com/documentation/14.0/developer/reference/addons/mixins.html?highlight