Relationship advice

mcbi4kh2 · **Joined:** Thu Jun 12, 2008 10:48 am **Posts:** 24

When I do this:

Code:

...

Set<Child> mySet = new HashSet<Child>();
mySet.add(lots of stuff);
parent.setChildSet(mySet);
aSession.save(parent);

I get the error org.hibernate.TransientObjectException:.

I want to save Parent AND the child set when I call .save();, and set parent_fk in each child to equals the parent PK.

Code:

public class Parent
{
  private  Set<Child> childSet = new HashSeT<Child>();

  public getChildSet()
  {
    return childSet;  
  }

}

Code:

public class Child
{
  private Long parent_fk;
  //Knows snothing of parent.
}

Code:

Parent Mapping

  <set name="childSet">
     <key column="parent_FK" />
     <one-to-many class="Parent" />
  </set>

Code:

Child Mapping

    <property name="parent_FK"  not-null="true" insert="true" type="java.lang.Long">
      <column name="PARENT_FK"/>
    </property>

mcbi4kh2 · **Joined:** Thu Jun 12, 2008 10:48 am **Posts:** 24

anyone?

mmerder · **Posted:** Tue Mar 03, 2009 11:29 am

Why do you need private Long parent_fk; in your child? If you really need it you have to set it as insert=false and update=false in your childmapping as this column is updated by the parent-child association.

You also need to add cascade to your one-to-many, so that childs get saved with the parent.