[英]Hibernate Search/Lucene range query with enum field doesn't return any results
使用 Hibernate 时搜索以下枚举字段:
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();
问题是即使用户具有高级或专家技能,也不会返回任何结果。
默认情况下,枚举是作为字符串的索引,因此您要求的范围实际上是“名称按字母顺序排列在单词 'ADVANCED' 之后的每个技能级别” 。
因此,我希望这可以匹配所有内容; 也许您在更改映射后忘记重新索引数据?
无论如何......如果您想将您的枚举索引为它们的序数,请实现一个自定义桥:
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<>();
}
并将序数而不是枚举传递给查询:
var q = queryBuilder.range().onField("skills.level").above(UserSkillLevel.ADVANCED.ordinal()).createQuery();
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