Is there a default field for Hibernate Search index?

tuxzilla · **Joined:** Mon May 07, 2007 8:37 pm **Posts:** 15

I used to use Compass to integrate Lucene and Hibernate. In compass you can specify whether a field is included in a default "all" field. For example, if I have a property named "title", I can index the the property into a "title" field as well as the default "all" field, unless I declare excluded-from-all="true". When I search for "+(some_title_word)", or " +title:some_title_word", the entity with "some_title_word" in the title will return. How do I achieve the same effect in Hibernate Search? Right now in my test, it seems that I have to use "title:" prefix to search for words in titles.

Thanks.

emmanuel · **Posted:** Wed May 23, 2007 9:06 pm

I never understood the need for a "all" field
you can achieve it by using MultiFieldQueryParser, plus MultiFieldQueryParser has the benefit of supporting per field boosting which I found very useful in most multi field usecases.

Here is an example (first part of it)

Code:

private static String[] productFields = {"title",
         "description", "actors.name", "categories.name"};

   private Query searchQuery(String searchQuery)
   {
      //lucene part
      Map<String,Float> boostPerField = new HashMap<String,Float>(4);
      boostPerField.put( "title", (float) 4);
      boostPerField.put( "description", (float) 2);
      boostPerField.put( "actors.name", (float) 2);
      boostPerField.put( "categories.name", (float) .5);

      QueryParser parser = new MultiFieldQueryParser(productFields, new StandardAnalyzer(), boostPerField);

      org.apache.lucene.search.Query luceneQuery;
      try
      {
         luceneQuery = parser.parse(searchQuery);
      }
      catch (ParseException e)
      {
         //do something here
         throw new RuntimeException("Unable to parse query: " + searchQuery, e);
      }

      //Hibernate Search
      FullTextSession ftSession =
            org.hibernate.search.Search.createFullTextSession(
                  (Session) em.getDelegate() );
      return ftSession.createFullTextQuery(luceneQuery, Product.class);

tuxzilla · **Joined:** Mon May 07, 2007 8:37 pm **Posts:** 15

Thanks for the example. I don't think the "all" field is obviously better. I just wonder whether there is a straight forward migration from Compass. Luckily MultiFieldQueryParser is easy to do.

I do have a further question. If you assign boost factors to the search terms, how are those related to the boost factors assigned to fields during indexing? Do you really just need to do one of the two?