VoteGroup包含关系VOTED_ON and VOTED_FOR给实体Criterion and Decision和清单Vote
@NodeEntity
public class VoteGroup extends BaseEntity {
private static final String VOTED_ON = "VOTED_ON";
private final static String VOTED_FOR = "VOTED_FOR";
private final static String CONTAINS = "CONTAINS";
@GraphId
private Long id;
@RelatedTo(type = VOTED_FOR, direction = Direction.OUTGOING)
private Decision decision;
@RelatedTo(type = VOTED_ON, direction = Direction.OUTGOING)
private Criterion criterion;
@RelatedTo(type = CONTAINS, direction = Direction.OUTGOING)
private Set<Vote> votes = new HashSet<>();
private double avgVotesWeight;
private long totalVotesCount;
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
VoteGroup voteGroup = (VoteGroup) o;
if (id == null)
return super.equals(o);
return id.equals(voteGroup.id);
}
@Override
public int hashCode() {
return id != null ? id.hashCode() : super.hashCode();
}
.....
}
Vote实体看起来像：
@NodeEntity
public class Vote extends BaseEntity {
private final static String CONTAINS = "CONTAINS";
private final static String CREATED_BY = "CREATED_BY";
@GraphId
private Long id;
@RelatedTo(type = CONTAINS, direction = Direction.INCOMING)
private VoteGroup group;
@RelatedTo(type = CREATED_BY, direction = Direction.OUTGOING)
private User author;
private double weight;
....
}
public class BaseEntity {
private Date createDate;
private Date updateDate;
public BaseEntity() {
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
public Date getUpdateDate() {
return updateDate;
}
public void setUpdateDate(Date updateDate) {
this.updateDate = updateDate;
}
}
还。我使用基于 BaseEntity 的 Neo4j 钩子：
@Configuration
@EnableNeo4jRepositories(basePackages = "com.example")
@EnableTransactionManagement
public class Neo4jConfig extends Neo4jConfiguration implements BeanFactoryAware {
...
/**
* Hook into the application lifecycle and register listeners that perform
* behaviour across types of entities during this life cycle
*
*/
@Bean
protected ApplicationListener<BeforeSaveEvent<BaseEntity>> beforeSaveEventApplicationListener() {
return new ApplicationListener<BeforeSaveEvent<BaseEntity>>() {
@Override
public void onApplicationEvent(BeforeSaveEvent<BaseEntity> event) {
BaseEntity entity = event.getEntity();
if (entity.getCreateDate() == null) {
entity.setCreateDate(new Date());
} else {
entity.setUpdateDate(new Date());
}
}
};
}
