如何在ColdFusion ORM中深层克隆持久实体？ [英] How do you deep clone a persistent entity in ColdFusion ORM?

问题描述

我有一个用作模板的持久实体：

I have a persistent entity that I'm using as a template:

Company
    Locations
        Departments
            Employees

换句话说， code>包含许多位置，其中包含许多 Departments ，其中包含许多员工。我有一个公司设置为模板，应该在创建新公司时复制。但是，此模板在数据库中是持久的。我尝试使用下面的代码深层克隆它：

In other words, a Company contains many Locations, which contains many Departments, which contains many Employees. I have one Company set up as a template that should be copied when a new company is created. However, this template is persistent in the database. I tried using the following code to deep clone it:

var template = EntityLoadByPK("Company", 13);
var company =  Duplicate(template);
EntitySave(company);

但我收到一个错误说，实体没有附加到会话。所以我试图在保存前分配0到所有的ID：

But I receive an error says that the entity is not attached to the session. So then I tried to assign 0 to all the IDs before saving:

company.setId(0);
for (location in company.getLocations())
{
    location.setId(0);
    // more nested for loops
}

但是我收到类似的错误。最后，我试图做一个直接的1：1属性的副本：

But I receive a similar error. Finally, I tried to do a direct 1:1 copy of the properties:

var newCompany = EntityNew("Company");
newCompany.setName(company.getName());
newCompany.setCEO(company.getCEO());
// etc...

但是这样会使对象变得越来越麻烦图表。是否有更容易的方法深层克隆一个持久化实体，以便你得到一个全新的瞬态实体，包括其所有的子集合？

But this gets more and more cumbersome the deeper the object graph goes. Is there an easier way of deep cloning a persistent entity so that you get a brand new transient entity, including all of its child collections?

推荐答案

上次我遇到同样的情况，我只是在根CFC中写了一个类似克隆的方法。无法调用 clone btw，因为它是保留我相信。

last time I encountered the same situation, I just wrote a clone-like method in the root CFC. Cannot call it clone btw, 'cause it's reserved I believe.

这篇关于如何在ColdFusion ORM中深层克隆持久实体？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！