我有一个简单的关系(帐户) - [IdentifiedBy] - >(身份),定义如下
@RelatedTo(type = "IDENTIFIED_BY", direction = Direction.OUTGOING)
private Set<Identity> identities = new HashSet<Identity>();
当我加载帐户并访问其身份时,会加载所有身份,但除ID以外的所有属性都为空 . 但是,如果我使用@Fetch注释该属性,那么将使用所有属性正确加载标识 . 这是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());
}
}
单元测试在最后一个断言上失败,但如果取消注释帐户上的@Fetch,则成功 .
2 回答
而不是使用
你应该做以下的事情:
不使用@Fetch关键字不会自动启用延迟加载 . 要延迟加载属性,请使用上面绘制的Neo4jTemplate .
这是设计的
http://static.springsource.org/spring-data/data-graph/snapshot-site/reference/html/#reference:simple-mapping