NHibernate的删除对象将被重新保存通过级联 [英] NHibernate Deleted object would be re-saved by cascade

问题描述

在我的解决方案我有关联的业务对象的一个​​分支。所以，当我尝试保存根对象处理后，我得到消息的异常已删除对象通过级联将被重新保存。什么是指删除对象后，其仍处于收藏，其他协会等存在。请问有人知道怎么去删除的对象引用的列表。
它很难找到没有调试器支持引用。

In my solution I have a branch of business objects with associations. So when I try save a root object after processing I get an exception with message "Deleted object would be re-saved by cascade". What means that after deleting of an object its still exists in collections, other association and so on. Does somebody knows how to get a list of references to the deleted object. Its very difficult to find references without debugger support.

推荐答案

最常见的情况的（我的经验） 的是有有一些配对/中对象的集合两根对象。

The most common scenario (my experience) is having two root objects having collections of some pairing/middle object.

public class Employee 
{
    public virtual IList<Occupation> Occupations { get; set; }
}
public class Company
{
    public virtual IList<Occupation> Occupations { get; set; }
}

现在，我们有职业像这样

public class Occupation
{
    public virtual Employee Employee { get; set; }
    public virtual Company  Company  { get; set; }
}

那么，会发生什么：

So, what could happen:

1. 我们删除职业从 employee.Occupations 集合。


2. 在此交易，工作单位，我们也tuch，因此加载在 公司


3. 公司被启动。其职业的收集得到加载。因此，参考去掉职业保持有


4. NHibernate的说：通过级联将被重新保存已删除的对象

1. we remove an Occupation from employee.Occupations collection.
2. During that transaction, unit of work, we also tuch and therefore load the Company
3. Company gets initiated. Its collection of Occupations get loaded. So the reference to removed Occupation is kept there
4. NHibernate says: Deleted object would be re-saved by cascade

解决方案（S）：

• 确保该公司不会装载（保持为代理）


• 或删除（）的职业也从 company.Occupations


• 请不要对公司方使用这样的映射：

• be sure that the Company is never loaded (stays as proxy)
• or Remove() the Occupation also from company.Occupations
• do not use mapping like this on Company side:

的（做的不可以使用级联）的

(do not use the cascade)

<bag name="Occupations" lazy="true" inverse="true" batch-size="25" 
     cascade="all-delete-orphan">
     // this above setting on Company side is making issues...
  <key column="Company_ID" />
  <one-to-many class="Occupation" />
</bag>

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