@index on abstract class ?

andlio · **Joined:** Tue Jul 19, 2011 2:16 pm **Posts:** 19

Hello everyone,

I would like indexing all my entities and search results in all of them in one request.
To resolve that, I made all my entities ihnerited from an abstract class. But when I create my query, I have the error HSEARCH000109: [...].domain.AbstractDomainEntity is not an indexed type.

In my indexes directory I have the following folder : "lucene\indexes\[...].domain.AbstractDomainEntity"

Here is my abstract class :

Code:

@Indexed
@SuppressWarnings("serial")
@MappedSuperclass
public abstract class AbstractDomainEntity implements Serializable {

   @Id
   @GeneratedValue
   private Long id;

   //...
}

And here the way I create the query :

Code:

QueryBuilder queryBuilder = fullTextEntityManager.getSearchFactory()
          .buildQueryBuilder().forEntity( AbstractDomainEntity.class ).get();

org.apache.lucene.search.Query luceneQuery = queryBuilder
   .keyword()
   .fuzzy()
      .withThreshold(rechercheFuzzyThreshold)
      .withPrefixLength(rechercheFuzzyPrefixLength)
   .onField(rechercheChamp)
   .matching(critere)
   .createQuery();

// wrap Lucene query in a javax.persistence.Query
javax.persistence.Query persistenceQuery = 
   fullTextEntityManager.createFullTextQuery(luceneQuery, AbstractDomainEntity.class);
      
// execute search
List<Object> result = persistenceQuery.getResultList();

What's wrong ??

sanne.grinovero · **Posted:** Sat Nov 10, 2012 6:15 am

Hi Andilo,
your query is correct as you can search by all types specifying any superclass, but you could also target Object.class or just omit the parameter to target all indexed types.

The problem you're having is that the @Indexed annotation is not inherited, you have to specify it on each domain object. I think we need that to allow subclasses without indexing as you might not want to index all subtypes, but please share your thoughts about this: we can propose changes to the team.

andlio · **Joined:** Tue Jul 19, 2011 2:16 pm **Posts:** 19

Hi sanne,

Thank you very much for your answer.

You said that my query is correct. But I think that my problem is about my queryBuilder :

Code:

QueryBuilder queryBuilder = fullTextEntityManager.getSearchFactory()
         .buildQueryBuilder().forEntity(AbstractDomainEntity.class).get();

I must set the class as parameter to the forEntity() method. Do you have another solution ?

sanne.grinovero · **Posted:** Tue Nov 13, 2012 6:36 am

Why is that a problem?
when using the QueryBuilder you need to target some entity.

andlio · **Joined:** Tue Jul 19, 2011 2:16 pm **Posts:** 19

The problem is that I can't create a queryBuilder to request all indexed entities, or all indexed entities for a given abstract class.
I have the following hierarchie : http://www.gliffy.com/pubdoc/4069422/L.png

I would like requesting for both entities ConcreteSubClass1_1_1 and ConcreteSubClass1_1_2.
I try to create a queryBuilder for the AbstractDomainEntity because it's the root class, but I have an error "AbstractDomainEntity is not an indexed entity".
How could I do ?

sanne.grinovero · **Posted:** Tue Nov 13, 2012 7:04 am

Looks like you need https://hibernate.onjira.com/browse/HSEARCH-703. You could implement that?

An alternative is to work around it by not using the QueryBuilder to create Queries but construct Lucene queries directly.

andlio · **Joined:** Tue Jul 19, 2011 2:16 pm **Posts:** 19

Hi sanne,

Thank you for your answer one more time.

The links describe my needs. It has been created one year ago :(

May be your solution is good. I'm going to search about creating a Lucene query. Do you have some links about it ?

sanne.grinovero · **Posted:** Wed Nov 14, 2012 8:00 am

Quote:

The links describe my needs. It has been created one year ago :(

It's an open source project: many people have ideas and we track them on JIRA, then anyone can implement them so that we get a mutual benefit from it. Usually if someone needs something badly he'll implement it, and we help with that and maintain it in future.
If it's still open after a year it is likely that this wasn't a very important issue.

Quote:

May be your solution is good. I'm going to search about creating a Lucene query. Do you have some links about it ?

checkout our tests, most use the standard Lucene Query API; you need to pick which kind of query you need, for example a single term query:
https://github.com/hibernate/hibernate-search/blob/master/hibernate-search-orm/src/test/java/org/hibernate/search/test/RamDirectoryTest.java#L60