我有一个简单的关系(帐户) - [IdentifiedBy] - >(身份),像这样SpringData Neo4j的节点属性
@RelatedTo(type = "IDENTIFIED_BY", direction = Direction.OUTGOING)
private Set<Identity> identities = new HashSet<Identity>();
定义。当我加载账户并访问其身份,所有身份被加载,但除ID之外的所有属性均为空。但是,如果我使用@Fetch注解属性,那么身份将正确加载,并具有所有属性。这是由设计还是我错过了什么?
@NodeEntity
public class Account {
@GraphId Long nodeId;
@RelatedTo(type = "IDENTIFIED_BY", direction = Direction.OUTGOING)
//@Fetch
private Set<Identity> identities = new HashSet<Identity>();
public Set<Identity> getIdentities() {
return identities;
}
public void setIdentities(Set<Identity> identities) {
this.identities = identities;
}
}
@NodeEntity
public class Identity {
@GraphId Long nodeId;
private String identifier;
public String getIdentifier() {
return identifier;
}
public void setIdentifier(String identifier) {
this.identifier = identifier;
}
}
public interface AccountRepository extends GraphRepository<Account> { }
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"/test-context.xml"})
@Transactional
public class AccountTests {
@Autowired
protected AccountRepository accountRepository;
@Test
public void accountMustLoadItsIdentities() {
Account acct = accountRepository.save(new Account());
Identity id = new Identity();
id.setIdentifier("merlin");
acct.getIdentities().add(id);
accountRepository.save(acct);
acct = accountRepository.findOne(acct.nodeId);
id = acct.getIdentities().iterator().next();
assertEquals("merlin", id.getIdentifier());
}
}
单元测试失败的最后一个断言,但成功,如果帐户@Fetch未注释。
这是由设计。如果你想要热切地提取关系,你需要注解。如果您不想使用注释,请查看文档中的高级映射模式。 – tstorms