Handling Automatic Relationship Updates in Neo4j vs JPA

gerrit.meier · January 29, 2025, 1:21pm

I updated the the example and added a intentional failing test there:

github.com/meistermeier/neo4j-issues-examples

discourse-72421/src/test/java/com/meistermeier/discourse72421/Discourse72421ApplicationTests.java

f0a9149dc


      
          
          		var device = foundEntry.get();
          		device.setDeviceManagerRelationship(null);
          		repository.save(device);
          
          		var loadedDevice = repository.findById("dev1").get();
          		assertThat(loadedDevice.getDeviceManagerRelationship()).isNull();
          
          	}
          	@Test
          	void removeRelationshipNotSuccessfully(@Autowired DeviceRepository repository, @Autowired Driver driver) {
          
          		try (var session = driver.session()) {
          			session.run("MATCH (n)-[r]->(m) return n, r, m")
          				.forEachRemaining(record -> System.out.printf("%s %s %s", record.get("n").asNode(), record.get("r").asRelationship(), record.get("m").asNode()));
          		}
          
          		var foundEntry = repository.findById("dev1");
          
          		assertThat(foundEntry).isPresent();

If I got you correctly, you are only changing the target node but not the relationship properties instance, right? You would have to replace also the relationship properties with a new class. Otherwise, SDN would assume that this is still the same relationship, having the same target node.

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Handling Automatic Relationship Updates in Neo4j vs JPA

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