cypher query to get all entities for which a specific field null

[Eugen Paraschiv]

Hi,
I'm trying to write a Cypher query to get all entities that have a specific field null;
entity is
Polygon{
    private Owner owner;
}
and the query should be:
getAllPolygonsWithNullOwner
Any help on this is appreciated.
Thanks.
Eugen.

[Peter Neubauer]

Eugen,
what are you using? Spring?

Cheers,

/peter neubauer

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If you can sketch, you can use a graph database - @neo4j

[Eugen Paraschiv]

Yes I am.
Exactly:
<neo4j.version>1.6.2</neo4j.version>
<neo4j-spatial.version>0.8</neo4j-spatial.version>
 <spring-data-neo4j.version>2.1.0.M1</spring-data-neo4j.version>
Eugen.

[Michael Hunger]

PolygonRepository extends GraphRepository<Polygon>{

  Iterable<Polygon> findByOwnerIsNull(); // willl work with primitive properties, but I'm not sure about references

  // this will work if I didn't put in a typo :)

  @Query("start n=__type__(className='com.examplePolygon') where not(n-[:OWNER]->()) return n"

  Iterable<Polygon> findByOwnerIsNull(); // willl work with primitive properties, but I'm not sure about references