如何通过Odoo 13中的按钮在保存或查看模式下打开包含现有记录的表单视图？

<button name="open_existing_record" string="Open Existing Record" type="object" class="oe_highlight"/>

def open_existing_record(self):
    # 获取当前记录的ID
    record_id = self.env.context.get('active_id')
    
    # 获取当前记录的模型
    model = self.env.context.get('active_model')
    
    # 使用`form`视图打开当前记录的表单视图
    return {
        'name': 'Existing Record',
        'type': 'ir.actions.act_window',
        'res_model': model,
        'res_id': record_id,
        'view_mode': 'form',
        'view_type': 'form',
        'target': 'current',
    }

<record id="view_form_button" model="ir.ui.view">
    <field name="name">Existing Record Button</field>
    <field name="model">your.model</field>
    <field name="arch" type="xml">
        <form>
            <header>
                <button name="open_existing_record" string="Open Existing Record" type="object" class="oe_highlight"/>
            </header>
        </form>
    </field>
</record>

<record id="view_form_your_model" model="ir.ui.view">
    <field name="name">Your Model Form</field>
    <field name="model">your.model</field>
    <field name="arch" type="xml">
        <form>
            <!-- 其他字段 -->
            
            <footer>
                <button string="Save" type="object" class="oe_highlight"/>
                <button string="Cancel" type="object" class="oe_link"/>
                <button name="open_existing_record" string="Open Existing Record" type="object" class="oe_highlight"/>
            </footer>
        </form>
    </field>
</record>