Spring Neo4J @Indexed (unique = true) data not working

Question

I am new to Neo4J and I probably have a simple question.

My application has NodeEntity, the property (name) is annotated using @Indexed (unique = true) to achieve uniqueness, as in JPA, using @Column (unique = true).

My problem is that when I save an object with a name that already exists in my chart, it still works fine. But I was expecting some kind of exception here ...?! Here is an overview of the main code:

@NodeEntity public abstract class BaseEntity implements Identifiable { @GraphId private Long entityId; ... } public class Role extends BaseEntity { @Indexed(unique = true) private String name; ... } public interface RoleRepository extends GraphRepository<Role> { Role findByName(String name); } @Service public class RoleServiceImpl extends BaseEntityServiceImpl<Role> implements { private RoleRepository repository; @Override @Transactional public T save(final T entity) { return getRepository().save(entity); } } 

And this is my test:

 @Test public void testNameUniqueIndex() { final List<Role> roles = Lists.newLinkedList(service.findAll()); final String existingName = roles.get(0).getName(); Role newRole = new Role.Builder(existingName).build(); newRole = service.save(newRole); } 

That I expect something to go wrong! How can I ensure the uniqueness of a property without checking it for myself?

PS: I use neo4j 1.8.M07, spring -data-neo4j 2.1.0.BUILD-SNAPSHOT and Spring 3.1.2.RELEASE.

Answer 1

I fell into the same trap ... while you create new entities, you will not see an exception - the last save () action wins the battle.

Unfortunately, a DataIntegrityViolationException will only be raised if an existing object is updated!

A detailed description of this behavior can be found here: http://static.springsource.org/spring-data/data-graph/snapshot-site/reference/html/#d5e1035

Answer 2

If you are using SDN 3.2.0+, use the failOnDuplicate attribute:

 public class Role extends BaseEntity { @Indexed(unique = true, failOnDuplicate = true) private String name; ... }