NHibernate 删除的对象将通过级联重新保存 [英] NHibernate Deleted object would be re-saved by cascade

问题描述

在我的解决方案中，我有一个带有关联的业务对象分支.因此，当我尝试在处理后保存根对象时，我收到一条异常消息已删除的对象将通过级联重新保存".这意味着删除一个对象后，它仍然存在于集合、其他关联等中.有人知道如何获取对已删除对象的引用列表.如果没有调试器支持，很难找到引用.

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

最常见的场景(我的经验)是有两个根对象具有一些配对/中间对象的集合.

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，我们有这样的Occupation

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

那么，会发生什么:

1. 我们从 employee.Occupations 集合中删除了 Occupation.
2. 在该交易中，工作单元，我们也触摸并因此加载Company
3. 公司成立.它的职业集合被加载.所以对移除的职业的引用保留在那里
4. NHibernate 说:删除的对象将通过级联重新保存

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:

• 确保公司永远不会被加载(作为代理)
• 或 Remove() 职业也来自 company.Occupations
• 不要在公司端使用这样的映射:

(不要不要使用级联)

<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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