Odoo13_联动下拉框

class ZeroneBook(models.Model):
    _name = "zerone.book"
    _description = "Zerone Books"
 
    business_tag1 = fields.Many2one('bus.type_1', string='业务类型1')
    business_tag2 = fields.Many2one('bus.type_2', string='业务类型2')

    # 设置联动规则
    @api.onchange('business_tag1')
    def _onchange_tag1_id(self):
        self.business_tag2 = False
        if self.business_tag1:
            # 如果第一个框有值，则设置第二个框的取值范围
            return {'domain': {'business_tag2': [('tag1_id', '=', self.business_tag1.id)]}}
        else:
            # 如果第一个框没有值，则第二个框滞空
            return {'domain': {'business_tag2': []}}


class bus_type_1(models.Model):
    _name = 'bus.type_1'
    _description = '业务类型1'

    # 下拉框中必须设置name字段为显示字段
    name = fields.Char('业务类型1', required=True)  # 必填
    ext = fields.Char(string='扩展id', default='0')

class bus_type_2(models.Model):
    _name = 'bus.type_2'
    _description = '业务类型2'

    tag1_id = fields.Many2one('bus.type_1', string='业务类型1的id')
    # 下拉框中必须设置name字段为显示字段
    name = fields.Char('业务类型2', required=True)  # 必填
    ext = fields.Char(string='扩展id', default='0')