Hi,

I have a field that in certain cases is persisted with null value. I don't know how I can create a query for the case that this field is null.

I have two classes, Group and Person in a many to many relationship.
I don't know how to create a search for the case of person without Group

A simplified domain model is:

Person
@Field(index=Index.TOKENIZED, store=Store.NO)
private String name;
@ManyToMany
@IndexedEmbedded
private Set<Grupo> groups = new HashSet<Grupo>();

Groups
@Field(index = Index.TOKENIZED, store = Store.YES)
private Long id;
@ContainedIn
@ManyToMany
private Set<Person> persons = new HashSet<Person>();

For the search of Person who have a group I've just included a clause for the group Id in the lucene query.
My problem is persons without a group.

Thanks

hello,
there's no concept of null in Lucene, you'll have to make sure a marker keyword is indexed and searched on exact matches of you keyword.
You can create a fake group or add an appropriate fieldBridge.

Hello,
Thank you!
I've implemented a fake boolean field to store this information.