Spring Data Neo4j not populating RelationshipEntity

Question

我正在创建实体和指向它们之间的RelationshipEntity。我将RelationshipEntity放置在一个实体中，然后保存该实体。这也会自动保存RelationshipEntity。

我知道关系已经保存，因为我可以分别检索实体和RelationshipEntity。但是，当我检索开始或结束实体时，它的关系集是空的。

我试过强迫渴望得到，但没有快乐
有人看到我在这里做错了什么吗？

我的实体。。。

@NodeEntity
public class Thing {
public Thing() {
    super();
}
@GraphId
private Long nodeId;
private Long uuid; // unique across domains
@Fetch
@RelatedToVia(type="some default type", direction = Direction.BOTH)
Set<ThingRelationship> relationships = new HashSet<ThingRelationship>();
@Fetch
private Set<Property<?>> properties;
public ThingRelationship relatedTo(Thing thing, String relationshipType){
    ThingRelationship thingRelationship = new ThingRelationship(this, thing, relationshipType);
    relationships.add(thingRelationship);
    return thingRelationship;
}
public Set<ThingRelationship> getRelationships() {
    return relationships;
}
...
}

我的关系实体。。。

@RelationshipEntity
public class ThingRelationship {
public ThingRelationship() {
    super();
}
//incremental neo4j set ID
@GraphId Long nodeId;
//Start and end nodes
@StartNode Thing startThing;
@EndNode Thing endThing;
//Relationship Type
@org.springframework.data.neo4j.annotation.RelationshipType
String relationship;
public ThingRelationship(Thing startThing, Thing endThing, String relationship) {
    super();
    this.startThing = startThing;
    this.endThing = endThing;
    this.relationship = relationship;
}

最后是我的测试。。。。（最终断言失败）

    @Test 
@Rollback(false)
public void testAddRelationship(){

    Thing thingA = new Thing();
    template.save(thingA);
    Thing retrievedThingA = template.findOne(thingA.getNodeId(), Thing.class);  //returns a thing OK
    assertNotNull(retrievedThingA);
    Thing thingB = new Thing();
    template.save(thingB);
    Thing retrievedThingB = template.findOne(thingB.getNodeId(), Thing.class);  //returns a thing OK
    assertNotNull(retrievedThingB);
    //Relationship
    ThingRelationship thingRelationship = thingB.relatedTo(thingA, "REALLY_REALLY_LIKES");
    template.save(thingRelationship);
    ThingRelationship thingRelationshipRetrieved = template.findOne(thingRelationship.getNodeId(), ThingRelationship.class);
    assertEquals(thingB.getNodeId(), thingRelationshipRetrieved.getStartThing().getNodeId());
    assertEquals(thingA.getNodeId(), thingRelationshipRetrieved.getEndThing().getNodeId());
    Thing retrievedThingFinal = template.findOne(thingB.getNodeId(), Thing.class);
    template.fetch(retrievedThingFinal.relationships);
    assertEquals(1, retrievedThingFinal.getRelationships().size());  //FAILS HERE
}

最后一个断言失败，返回"预期为1，但实际为0"：(由于我正在急切地获取，返回的实体是否应该不存在RelationshipEntity？

Answer 1

问题在于下面的

@RelatedToVia(type="some default type", direction = Direction.BOTH)
Set<ThingRelationship> relationships = new HashSet<ThingRelationship>();

将其更改为以下有效。

@RelatedToVia(type="REALLY_REALLY_LIKES", direction = Direction.BOTH)
Set<ThingRelationship> relationships = new HashSet<ThingRelationship>();

如果你使用动态关系，不知道为什么它不起作用。