当在Odoo12中创建了模型B的新实例(将many2one字段设置为模型A )时，如何更改模型A中的布尔值？

class ModelB(models.Model):
    _name = 'model.b'
    
    field_a = fields.Many2one('model.a', string='Field A')

<record id="view_model_b_form" model="ir.ui.view">
    <field name="name">model.b.form</field>
    <field name="model">model.b</field>
    <field name="arch" type="xml">
        <form>
            <sheet>
                <group>
                    <field name="field_a"/>
                </group>
            </sheet>
        </form>
    </field>
</record>

class ModelB(models.Model):
    _name = 'model.b'
    
    field_a = fields.Many2one('model.a', string='Field A')
    
    @api.model
    def create(self, vals):
        record = super(ModelB, self).create(vals)
        
        # 获取模型A的实例
        model_a = self.env['model.a'].browse(vals.get('field_a'))
        
        # 更改模型A中的布尔值
        model_a.write({'boolean_field': True})
        
        return record

<record id="view_model_a_form" model="ir.ui.view">
    <field name="name">model.a.form</field>
    <field name="model">model.a</field>
    <field name="arch" type="xml">
        <form>
            <sheet>
                <group>
                    <field name="boolean_field"/>
                </group>
            </sheet>
        </form>
    </field>
</record>