Hibernate Search查询多个实体

时间:2018-11-21 14:17:58

标签: java hibernate lucene hibernate-search

我想对具有特定于实体的限制的多个实体建立一个休眠查询。理想情况下,所有结果都将从同一查询中返回,以便可以根据相关性对它们进行排序。

实体是事件,组和地点(Postable的每个子类)和配置文件。对事件的限制是它们从今天开始或将来开始。对Postables的限制是它们都具有PostableVisibility.PUBLIC的可见性。

Profile类没有可见性字段,只有Event类具有schedule.startDate。此外,“个人档案”和“可发布物品”具有不同的搜索字段(与“名称”相同)。我已经能够分别创建可见性/开始日期限制,但无法同时应用这两个限制并无法从所有课程中获取结果。

以下是有关域模型的详细信息:

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = "postables")
public abstract class Postable{
   /**
   * determines who can see the postable in relation to the creatorId
    */
   @Column(name = "visibility", nullable = false)
   @Enumerated(EnumType.STRING)
   @Field(analyze=Analyze.NO)
   protected PostableVisibility visibility;

   @Column(name = "name", nullable = false)
   @Field
   protected String name;

   @Column(name = "type", nullable = false)
   @Field
   protected String type;

   @Column(name = "description", nullable = false)
   @Field
   protected String description;
}

@Entity
@Table(name = "events")
@Indexed
public class Event extends Postable {
   @IndexedEmbedded
   private Schedule schedule;
}

@Embeddable
public class Schedule {

   @Column(name = "end_date")
   private LocalDate endDate;

   @Column(name = "end_time") 
   private LocalTime endTime;

   @Column(name = "start_date")
   @Field
   private LocalDate startDate;

   @Column(name = "start_time")
   @Field
   private LocalTime startTime;
}

@Entity
@Table(name = "groups")
@Indexed
public class Group extends Postable {

}

@Entity
@Table(name = "places")
@Indexed
public class Place extends Postable {

}

public class Profile {
   @Column(name = "name")
   @Field
   private String name;

   @Column(name = "username")
   @Field(analyze= Analyze.NO)
   private String username;
}

最后,尝试建立查询。我已经尝试过使用查询生成器的不同组合来完成此操作,但是没有运气。在下面的查询中,所有用户查询,可见性限制和当前事件限制都被应用,但我仅获得事件的结果。

public List<Object> searchAll(String userQueryString) {
    int maxResults = 20;
    Session session = this.currentSession();
    FullTextSession fullTextSession = Search.getFullTextSession(session);

    // Query builders:
    QueryBuilder postableQB = fullTextSession.getSearchFactory().buildQueryBuilder().forEntity(Postable.class).get();
    QueryBuilder eventQB = fullTextSession.getSearchFactory().buildQueryBuilder().forEntity(Event.class).get();

    // Filter queries
    Query publicPostableQuery = postableQB.keyword().onField("visibility").matching(PostableVisibility.PUBLIC).createQuery();
    String defaultTimeZone = "America/New_York";
    LocalDate today = LocalDate.now(ZoneId.of(defaultTimeZone));
    Query currentEventQuery = eventQB.range().onField("schedule.startDate").above(today).createQuery();

    // User text query
    Query userQuery = postableQB.simpleQueryString().onField("name").boostedTo(5f) // working
            .andField("type").boostedTo(3f)
            .andField("description")
            .andField("username").boostedTo(5f)
            .matching(userQueryString)
            .createQuery();

    Query combinedQuery = postableQB.bool()
            .must(userQuery)
            .must(publicPostableQuery)
            .must(currentEventQuery)
            .createQuery();

    FullTextQuery fullTextQuery = fullTextSession.createFullTextQuery(combinedQuery, Postable.class, Profile.class);
    fullTextQuery.setFirstResult(0).setMaxResults(maxResults);
    return fullTextQuery.list();
}

1 个答案:

答案 0 :(得分:1)

您当前的查询要求将来所有结果都为startDate,即使它们不是“事件”也是如此。由于非事件没有startDate,因此它们不匹配。

表达您想要的内容的一种更好的方法是,要求所有结果中都没有startDate。这样,没有startDate的文档也将匹配。可见性也是如此,它不包含在配置文件中。

    Query privatePostableQuery = postableQB.bool()
            .should(postableQB.keyword().onField("visibility").matching(PostableVisibility.FOLLOWERS).createQuery())
            .should(postableQB.keyword().onField("visibility").matching(PostableVisibility.INVITE).createQuery())
            .createQuery();
String defaultTimeZone = "America/New_York";
LocalDate today = LocalDate.now(ZoneId.of(defaultTimeZone));
Query pastEventQuery = eventQB.range().onField("schedule.startDate").below(today).excludeLimit().createQuery();

// User text query
Query userQuery = postableQB.simpleQueryString().onField("name").boostedTo(5f) // working
        .andField("type").boostedTo(3f)
        .andField("description")
        .andField("username").boostedTo(5f)
        .matching(userQueryString)
        .createQuery();

Query combinedQuery = postableQB.bool()
        .must(userQuery)
        .must(privatePostableQuery).not()
        .must(pastEventQuery).not()
        .createQuery();