CODEWITHSUNDEEP
neo4jspring-dataspring-data-neo4jneo4j-ogm
rohaldb
rohaldb

Reputation: 588

Neo4j OGM unexpectedly deleting relationship

I have two connected entities

(ProductInstance)-[:INSTANCE_OF]->(Product)

I am now attempting to create a ChangeroomSession, which has a relationship to several ProductInstances:

public class ChangeroomSession {
    //other fields
    @Relationship(type = "INCLUDES", direction = Relationship.Direction.OUTGOING)
    private List<ProductInstance> productInstances;
}

Doing so results in the unexpected deletion of already-persisted relationships between ProductInstances and Products in my graph. For example, assume I have two ProductInstances p1,p2 (light blue) connected to a single Product (dark blue).

enter image description here

Next, I create a new ChangeroomSession and set its product instance list to contain both p1 and p2. After performing this operation, the ChangeroomSession persists with relationships to p1 and p2 successfully, but the relationship between one of the ProductInstances and the Product is unexpectedly deleted.

enter image description here

Here is the code:

List<ProductInstance> productInstances = findProductInstancesByIdIn(...)   
ChangeroomSession changeroomSession = new ChangeroomSession(productInstances);
this.changeroomSessionRepository.save(changeroomSession);

What is even more interesting is that if I set a breakpoint in the code execution, the changeroomSession object I am about to persist shows the missing relationship as being present. More than that, the returned object from the .save operation also shows it. It is only after the persist operation if I query the database again that the relationship is gone

Debugger output Debugger output

This feels like unexpected behaviour - am I missing something? Why is this happening? Thanks!

Upvotes: 1

Views: 151

Answers (0)

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