database - NHibernate : delete error -

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model: have model in 1 installation can contain multiple "computer systems".

database: table installations has 2 columns name , description. table computersystems has 3 columsn name, description , installationid.

mappings:

i have following mapping installation:

<?xml version="1.0" encoding="utf-8"?>  <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="myprogram.core" namespace="myprogram">    <class name="installation" table="installations" lazy="true">      <id name="id" column="id" type="int">       <generator class="native" />     </id>      <property name="name" column="name" type="string" not-null="true" />     <property name="description" column="description" type="string" />       <bag name="computersystems" inverse="true" lazy="true" cascade="all-delete-orphan">       <key column="installationid" />       <one-to-many class="computersystem" />     </bag>    </class>  </hibernate-mapping>

i have following mapping computersystem:

<?xml version="1.0" encoding="utf-8"?> 

<id name="id" column="id" type="int">   <generator class="native" /> </id>  <property name="name" column="name" type="string" not-null="true" /> <property name="description" column="description" type="string" />  <many-to-one name="installation" column="installationid" cascade="save-update" not-null="true" />

classes:

the installation class is:

public class installation  {      public virtual string description { get; set; }     public virtual string name { get; set; }        public virtual ilist<computersystem> computersystems     {                  {             if (_computersystemitems== null)             {                 lock (this)                 {                     if (_computersystemitems== null)                         _computersystemitems= new list<computersystem>();                 }             }             return _computersystemitems;         }          set         {             _computersystemitems= value;          }     }      protected ilist<computersystem> _computersystemitems;         public installation()     {         description = "";         name= "";     }       }

the computersystem class is:

public class computersystem { public virtual string name { get; set; } public virtual string description { get; set; } public virtual installation installation { get; set; }

}

the issue error when trying delete installation contains computersystem. error is: "deleted object re-saved cascade (remove deleted object associations)". can ?

regards, seb

i think caused cascade="save-update" in mapping file computersystem. if don't need cascade in direction (child parent) may able remove it.

alternatively, try clearing installation object's computersystems list before deleting instalation.


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