使用枚举字段的 Hibernate Search/Lucene 范围查询没有 return 任何结果

Question

使用具有以下枚举字段的 Hibernate Search 时：

public class UserSkill {
    @Enumerated
    @Field
    private UserSkillLevel level; // <- this is the field we're using on the ranged query
}

public class User { // <- this is the root class
    @IndexedEmbedded
    private Set<UserSkill> skills = new HashSet<>();
}

这是枚举：

public enum UserSkillLevel {
    JUNIOR,
    CONFIRMED,
    ADVANCED,
    EXPERT
}

尝试进行范围查询时：

var fullTextEntityManager = Search.getFullTextEntityManager(entityManager);

var queryBuilder = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity(User.class).get();

var bq = new BooleanQuery.Builder();

var q = queryBuilder.range().onField("skills.level").above(UserSkillLevel.ADVANCED).createQuery();
bq.add(q, BooleanClause.Occur.MUST);

return fullTextEntityManager.createFullTextQuery(bq.build(), User.class).getResultList();

问题是没有返回任何结果，即使用户具有高级或专家技能。

Answer 1

枚举默认是字符串索引，所以你要求的范围实际上是"every skill level whose name is alphabetically after the word 'ADVANCED'".

因此我希望它能匹配 所有东西；也许您在更改映射后忘记重新索引数据？

无论如何......如果你想将你的枚举索引为它们的序号，实现一个自定义桥：

public class EnumAsIntegerBridge implements MetadataProvidingFieldBridge {
    @Override
    public void configureFieldMetadata(String name, FieldMetadataBuilder builder) {
        builder.field( name, FieldType.INTEGER );
    }

    @Override
    public void set(String name, Object value, Document document, LuceneOptions luceneOptions) {
        Enum<?> enum = (Enum<?>) value;

        if ( enum != null ) {
            luceneOptions.addNumericFieldToDocument( name, enum.ordinal(), document );
        }
    }
}

然后在您的映射中使用它：

public class UserSkill {
    @Enumerated
    @Field(bridge = @FieldBridge(impl = EnumAsIntegerBridge.class))
    private UserSkillLevel level;
}

public class User {
    @IndexedEmbedded
    private Set<UserSkill> skills = new HashSet<>();
}

并将序号而不是枚举传递给查询：

var q = queryBuilder.range().onField("skills.level").above(UserSkillLevel.ADVANCED.ordinal()).createQuery();

使用枚举字段的 Hibernate Search/Lucene 范围查询没有 return 任何结果

Hibernate Search/Lucene range query with enum field doesn't return any results

java

lucene

enums

hibernate

hibernate-search