grails - 在 Grails 中，域类中是否有像 onLoad() 这样的东西？

Question

伙计们，

我有以下域类:

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，有没有一个地方会在加载域实例时自动调用以生成productRecord 编号？

最好的方法是什么？

Answer 1

您可能可以利用 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

查看文档以获取一些示例。