如果表单视图中有字段is_bus_registered，下面的字段定义就足够了：

att_policy_id = fields.Many2one(
    comodel_name='hr.attendance.policy',
    string='Attendance Policy',
    domain='[("is_bus_registered", "=", is_bus_registered)]')

请记住以下几点：如果用户使用is_bus_registered==False设置策略，然后将is_bus_registered更改为True，则在没有onchange事件的情况下策略不会更改。这可能会导致错误的策略。因此使用或定义onchange事件可能并不那么糟糕。

我用onchange添加了另一个字段many2many

@api.onchange('is_bus_registered')
def _onchange_is_bus_registered(self):
    for rec in self:
        if rec.is_bus_registered:
            rec.att_policy_id = False
            policy_ids = []
            policies = self.env['hr.attendance.policy'].search(
                [('is_bus_registered', '=', True)])
            for policy in policies:
                policy_ids.append(policy.id)
            rec.att_policy_ids = policy_ids
        else:
            rec.att_policy_id = False
            policy_ids = []
            policies = self.env['hr.attendance.policy'].search(
                [('is_bus_registered', '=', False)])
            for policy in policies:
                policy_ids.append(policy.id)
            rec.att_policy_ids = policy_ids

att_policy_ids = fields.Many2many('hr.attendance.policy', string='Attendance Policy')

然后在表单视图中添加，但不可见，并将其放在many2one字段的静态域中..它工作正常

<field name="att_policy_ids" invisible="1"/>
<field name="att_policy_id" required="1" domain="[('id','in',att_policy_ids)]"/>