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Indexes not getting updated (I'm sooo close.)

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dogu

Post subject: Indexes not getting updated (I'm sooo close.)

Posted: Thu Jan 05, 2006 4:23 pm

Newbie

Joined: Thu Jan 05, 2006 4:13 pm
Posts: 4

I feel like I'm sooo close and just doing something dumb.

I've got an Activity that contains a list of Contributions. The Contributions point back to a single activity as their parent. I'm trying to let Hibernate maintain the indexes for me. When I add a list of contributions for the very first time, it works correctly, with the indexes on the contributions being what I expect. contrib1[0], contrib2[1], contrib3[2]

However, if I try to add a new contribution to the list at the beginning, only the contribution I'm adding gets updated. The others don't get reindexed.

It becomes contrib4[0], contrib1[0], contrib2[1], contrib3[2].

I've tried to "copy all elements, clear() the original instance, and addAll()" to no avail. From this article: http://forum.hibernate.org/viewtopic.php?t=945944

I've gotta be close, does anyone see anything I might be missing?

Here's my list of Contribs in my Activity.hbm.xml

Code:

<list name="contribs" 
     lazy="true" 
     cascade="all-delete-orphan">
   <key column="activityID" 
        not-null="true" 
        update="false"/>
   <list-index column="pos" base="0"/>
   <one-to-many class="Contrib"/>
</list>

Here's my activity from the contribution.

Code:

<many-to-one name="activity" class="Activity" column="activityID" not-null="true" insert="false" update="false" />

Here's where I add a new Contribution:

Code:

public void addContrib(Contrib inContrib, int pos)
{
   inContrib.setActivity(this);
   ArrayList newArray = new ArrayList(contribs);
   newArray.add(pos,inContrib);
   contribs.clear();
   contribs.addAll(newArray);
}

Thanks for any help.

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michael

Post subject:

Posted: Fri Jan 06, 2006 8:09 am

Hibernate Team

Joined: Tue Sep 09, 2003 2:10 pm
Posts: 3246
Location: Passau, Germany

Probably this will help: http://www.hibernate.org/193.html

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dogu

Post subject: Found the solution

Posted: Fri Jan 06, 2006 11:36 pm

Newbie

Joined: Thu Jan 05, 2006 4:13 pm
Posts: 4

Yup. I was right. It turned out to be pretty easy.

I had update="false" instead of update="true".

It should be:

Code:

<list name="contribs" 
       lazy="true" 
       cascade="all-delete-orphan">
       <key column="activityID" 
           not-null="true" 
           update="true"/>
   <list-index column="pos"/>
   <one-to-many class="Contrib"/>
</list>

And the code to put the object into the right spot was...

Code:

public void addContrib2(Contrib inContrib, int pos)
throws GSException
{
  if(inContrib == null)
 {
      throw new IllegalArgumentException("Null Contribution cannot be added");
}
      
 if(inContrib.getActivity() != null)
 { 
    inContrib.getActivity().getContribs().remove(inContrib);
 }
       
 if (pos < 0)
 {
    pos = 0;
 }
 else if(pos > contribs.size())
 {
        pos = contribs.size();
 }

 List lowerList = new ArrayList<Contrib>(this.getContribs().subList(0,pos));
 List upperList = new ArrayList<Contrib>(this.getContribs().subList(pos,  getContribs().size()));
      
 contribs.clear();
      
 contribs.addAll(lowerList);
 contribs.add(inContrib);
 contribs.addAll(upperList);
}

I have noticed that, if you do a:

Code:

contribs.add(pos, Contrib);

The object in the position you are writing to will keep its same position. Thus, you'll get contrib1[0], contrib4[0], contrib2[1], contrib3[2] (I just wanted to use the word "thus".)

Some catch words in case people search for them: overwritten, reindexed, overwrite

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