Spring-Data-Neo4j：无法使用 neo4jtempalte createRelationshipBetween)() 方法创建实体之间的关系

Question

我正在使用 spring-data-neo4j 创建两个节点之间的关系，但关系不会持续存在。服务器没有抛出异常。当我获取节点时，其中有一个空值。我正在使用 Neo4jTemplate createRelationshipBetween() 方法。以下是我的代码：

关系实体：

@RelationshipEntity(type=RelationshipTypes.FRIEND)
public class FriendsRelationship extends BaseEntity{

@StartNode
@Getter @Setter
private Person person;
@EndNode
@Getter @Setter
private Person friend;
@Getter @Setter
private String friendsType;
}


public class CreateEntitiesRelationship {

@Autowired
private Neo4jTemplate neo4jTemplate;

-------------------------------

public FriendsRelationship createRelationshipBetweenPersons(Person person, Person friend, 
        Class<FriendsRelationship> relationshipEntity, String friendshipType) {
    FriendsRelationship relationship = neo4jTemplate.createRelationshipBetween(person, friend, relationshipEntity, RelationshipTypes.FRIEND, false);
    neo4jTemplate.save(relationship);
    return relationship;
}
}

实际问题是什么，我无法弄清楚。如果 Neo4j，我是新手。

Answer 1

试试这个代码：

 {
    Person _person = neo4jTemplate.save(person); 
    Person _friend = neo4jTemplate.save(friend);
    FriendsRelationship relationship = neo4jTemplate.createRelationshipBetween(_person, _friend, relationshipEntity, RelationshipTypes.FRIEND, false);
    neo4jTemplate.save(relationship);//optional. saved by default
    return relationship;
}