仅在客户保存后才显示标题按钮的条件

Question

只有当客户被保存时，我已经尝试了很多方式才能显示“提供信函”按钮。但似乎我没有得到的条件就在这里：

<xpath expr="//form/*" position="before"> 
        <header> 
         <button name="offer_letter" string="Offer Letter" type="object" class="oe_highlight" 
           attrs="{'invisible':[('what condition?')]}"/> 
        </header> 
       </xpath> 

下面是我的代码片段：

的型号：

class res_partner(models.Model): 
    _inherit = 'res.partner' 

    baf = fields.Boolean("Application Form", help="Specify customer who bought application form") 

    @api.multi 
    def offer_letter_method(self): 
     return self.env['report'].get_action(self, 'sales_custom.offer_letter_view') 

的观点：

<record model="ir.ui.view" id="customer_custom_form_view"> 
      <field name="name">customer.custom</field> 
      <field name="model">res.partner</field> 
      <field name="inherit_id" ref="base.view_partner_form"/> 
      <field name="arch" type="xml"> 
       <xpath expr="//form/*" position="before"> 
        <header> 
         <button name="offer_letter" string="Offer Letter" type="object" class="oe_highlight" 
           attrs="{'invisible':[('what condition?')]}"/> 
        </header> 
       </xpath> 
       <xpath expr="//field[@name='name']" position="after"> 
        <field name="baf"/> 
        <label for="baf"/> 
       </xpath> 
      </field> 
     </record> 

请助攻。

Answer 1

你应该尝试如下：

<record model="ir.ui.view" id="customer_custom_form_view"> 
    <field name="name">customer.custom</field> 
    <field name="model">res.partner</field> 
    <field name="inherit_id" ref="base.view_partner_form"/> 
    <field name="arch" type="xml"> 
     <xpath expr="//form/*" position="before"> 
      <header> 
       <button name="offer_letter" string="Offer Letter" type="object" class="oe_highlight" 
         attrs="{'invisible':[('id','=',False)]}"/> 
         <field name="id" invisible="1"/> 
      </header> 
     </xpath> 
     <xpath expr="//field[@name='name']" position="after"> 
      <field name="baf"/> 
      <label for="baf"/> 
     </xpath> 
    </field> 
</record>