SDN not creating UUID when saving

[mrksph]

Hi,

Spring Boot 2.4.2, SDN 6.0.3

Im trying to save a Node which has an Outgoing Relationship with UUID as its ID.

@RelationshipProperties
@Getter
@Setter
public class TestRelationship {

@Id
@GeneratedValue(generatorClass = UUIDStringGenerator.class)
private UUID uuid:

@TargetNode
private Node child;

}

Node parent = new Node();
Node child = new Node();

TestRelationship testRel = new TestRelationship();
testRel.setChild(child);
parent.setRel(testRel);
repository.save(parent);

This results in the relationship not saving the UUID.

[michael-simons]

This is expected behavior. @RelationshipProperties classes are no entities and don't carry externally generated IDs (such as UUIDs). The only supported generated ID value on them is

@Id @GeneratedValue
private Long id;

which corresponds to the id assigned via Neo4j (the database). Quoting the docs (since 6.0.4)

You should define a property for the generated, internal ID so that SDN can determine during save which relationships can be safely overwritten without losing properties. A generated id property is optional in SDN 6.0.4 and upwards and will be required in SDN 6.1 for @RelationshipProperties.

https://docs.spring.io/spring-data/neo4j/docs/6.0.7/reference/html/#mapping.annotations.relationship.properties