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http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-115?pag...
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Hardy Ferentschik commented on HSEARCH-115:
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As far as I can see there should be no problem to add a 'default' parameter to the
Field annotation. We could then pick up this annotation in BridgeFactory.guessType( ) and
pass it to the build in bridge (provided no custom bridge is provided). Since so many
buildin bridges extend the NumberBridge you pretty much only have to change this bridge
together with the StringBridge.
So technically it should be straight forward, but before I would go ahead I have a few
questions.
The buildin bridges are all implementing TwoWayStringBridge. How would you resolve
ambiguities? If I for example use the string 'null' as default for a null object
(as suggested in the example), but one of my objects also contains 'null' as a
value, how do I map the string 'null' for stringToObject()? I guess since the
default anntotation would be sepcified you would map the string 'null' always to
null. This would mean that it is up to the user to ensure that her data does not contain
any ambiguities.
Given the potential problems wouldn't it be better to not add this feature to the
build in bridges? As said user can always use/implement a custom bridge. Or we introduce
additional custom bridges which don't implement TwoWayStringBridge?
Add a default value for indexing null value
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Key: HSEARCH-115
URL:
http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-115
Project: Hibernate Search
Issue Type: Improvement
Components: mapping
Reporter: Julien Brulin
Assignee: Hardy Ferentschik
Fix For: 3.0.1, 3.1.0
Hi,
Null elements are not indexed by lucene then it's not easy to use a nullable property
in lucene query.
I have a TagTranslation entity in my model with a nullable property language. In this
case null is used as default language for tag translation.
Each translation may have many variations like synonyms.
Because I can specified a default value for null value in the @Field annotation like this
@Field(index=Index.UN_TOKENIZED, store=Store.NO, default='null'), i can't
search a cat tag with a default translation like this : +value:cat* +lang:null
<pre></code>
@Entity()
@Table(name="indexing_tag_trans")
@org.hibernate.annotations.Cache(usage=org.hibernate.annotations.CacheConcurrencyStrategy.READ_WRITE)
@Indexed
public class TagTranslation implements java.io.Serializable {
private static final long serialVersionUID = -1065316566731456110L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@DocumentId
private Integer id;
@Field(index=Index.UN_TOKENIZED, store=Store.NO)
private String language;
@Field(index=Index.TOKENIZED, store=Store.YES)
private String value;
@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY)
@org.hibernate.annotations.Fetch(org.hibernate.annotations.FetchMode.SUBSELECT)
@JoinColumn(name="translation_id")
@IndexedEmbedded
private List<TagVariation> variations = new LinkedList<TagVariation>();
public TagTranslation() { }
...
</code>
</pre>
What do you think about that ?
Ps: sorry for english write, i am a french guy.
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