neo4j ogm - 我们可以更新一个RelationshipEntity指向另一个NodeEntity吗？

我正在使用Neo4j-OGM更新a @RelationshipEntity指向另一个节点对象。但是，当我尝试保留更改时，不会保存更改，而只是恢复为原始实体。

例如，这就是我要实现的目标：

from:    (X)--[R]->(M)    (Y)

  to:    (Y)--[R]->(M)    (X)

我在CineastsRelationshipEntityTest集成测试中做了一个例子：

@Test
public void canUpdateRelationshipEntity() {
    Movie movie = new Movie("M", 2020);

    Actor actor = new Actor("X");
    Role relationship = actor.playedIn(movie, "R");

    Actor actor2 = new Actor("Y");
    actor2.setRoles(new HashSet<>());

    assertThat(actor.getRoles()).hasSize(1);
    assertThat(actor2.getRoles()).hasSize(0);

    session.save(actor);
    session.save(actor2);

    session.clear();


    // try to update the relationship:
    relationship.setActor(actor2);
    actor.getRoles().remove(relationship);
    actor2.getRoles().add(relationship);

    assertThat(actor.getRoles()).hasSize(0);
    assertThat(actor2.getRoles()).hasSize(1);

    session.save(actor);
    session.save(actor2);

    session.clear();



    Actor loadedActor = session.load(Actor.class, actor.getUuid());
    Actor loadedActor2 = session.load(Actor.class, actor2.getUuid());

    assertThat(loadedActor.getRoles()).hasSize(0);
    assertThat(loadedActor2.getRoles()).hasSize(1);
}

最后，loadedActor并loadedActor2没有反映更新的关系。