在Grails中是否有像onLoad（）这样的域类？ [英] In Grails is there something in domain class like onLoad()?

问题描述

伙计，

我有一个以下的域类：

  class Product {
 String name，
 String productRecord，
 
 static transients = ['productRecord'] 
} 
  
 
 
 
 productRecord是根据Product实例的id自动生成的字段。
 
 
 
所以我一直在想，是否有一个地方会在域实例加载时产生productRecord数字时自动调用？
 
 
 
最好的方法是做什么？
解决方案
您可以利用内置域名事件：
 
 
 GORM支持将事件注册为某些事件发生时触发
的方法，如删除，inser ts和更新。 
下面是一个支持事件的列表：
 
 
 
 
 
 beforeInsert  - 在一个对象最初持续到
之前执行数据库
 
 
 beforeUpdate  - 更新对象前执行
 
 
 beforeDelete  - 删除对象前执行
 
 
 beforeValidate  - 在对象验证前执行
 
 afterInsert  - 将对象持久保存到数据库后执行
 
 afterUpdate  - 更新对象后执行
 
 
 afterDelete  - 在删除对象后执行
 
 onLoad  - 从数据库加载对象时执行
 
 
 
查看一些例子的文档。
 
Guys,

I have a following domain class:
class Product { 
    String name, 
    String productRecord,

    static transients = ['productRecord']
}
productRecord is a field which is generated automatically based on the id of the Product instance.

So I've been thinking, is there a place which will be automatically called when a domain instance is load to generate the productRecord number?

What's the best way to do that?
解决方案
You can probably leverage the built-in Domain Events:

  
GORM supports the registration of events as methods that get fired
  when certain events occurs such as deletes, inserts and updates. The
  following is a list of supported events:
  
  

  
beforeInsert - Executed before an object is initially persisted to
  the database
  
beforeUpdate - Executed before an object is updated
  
beforeDelete - Executed before an object is deleted
  
beforeValidate - Executed before an object is validated
  
afterInsert - Executed after an object is persisted to the database
  
afterUpdate - Executed after an object has been updated
  
afterDelete - Executed after an object has been deleted
  
onLoad - Executed when an object is loaded from the database
  
Have a look at the docs for some examples.

                        
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