带LeftJoin的SpringData可分页投影与JPA2.1

Question

我有一个2.1.4版本的项目，带有spring boot数据。

该项目具有以下关系实体：ApplicationEntity ApplicationTranslateEntity LanguageEntity它在数据库中有一个区域设置关系表（ManyToMany）,该表中有一个用于不同语言的文本的额外表（ApplicationTranslateEntity）。

    @Getter
    @Setter
    public class ApplicationEntity {

    @Id
    private Long id;

    private String urlImage;
    private String urlStoreiOS;
    private String urlStoreAndroid;

    @OneToMany(mappedBy = "application")
    Set<ApplicationTranslationEntity> applicationTranslationEntities;

}

@Getter
@Setter
public class ApplicationTranslationEntity {
    @EmbeddedId
    ApplicationTranslationKey id;

    @ManyToOne
    @MapsId("application_id")
    @JoinColumn(name = "application_id")
    ApplicationEntity application;

    @ManyToOne
    @MapsId("language_id")
    @JoinColumn(name = "language_id")
    LanguageEntity language;

    @Column(length = 100)
    private String name;

    @Column(length = 1000)
    private String description;

}

public interface ApplicationProjection {

    Long  getId();
    String getName();
    String getDescription();
    String getUrlImage();
    String getUrlStoreiOS();
    String getUrlStoreAndroid();
}

 @Query("select  a.id as id, a.urlImage as urlImage, at.name as name, at.description as description  from ApplicationEntity a left join a.applicationTranslationEntities at on at.language.key = :language")
Page<ApplicationProjection> findAllByLanguage(Pageable pageable, Language language);

 @GetMapping()
Page<ApplicationDto> all(Pageable pageable, @RequestHeader(value= headerAcceptEncoding, required = false) Language language){
    return applicationService.findAll(pageable,language);
}

org.hibernate.QueryException：无法解析属性：名称:******Entity.ApplicationEntity[选择a.id作为id，a.urlImage作为urlStoreiOS，a.urlStoreAndroid作为urlStoreAndroid，a.name作为名称，a.description作为描述从********.Entity.ApplicationEntity左联接a.applicationtranslationEntitya.at.language.key=：语言顺序由a.id asc,a.name asc]；嵌套异常为java.lang.IllegalArgumentException：org.hibernate.QueryException：无法解析属性：名称:********.Entity.ApplicationEntity[选择a.id作为id，a.urlImage作为urlStoreiOS，a.urlStoreAndroid作为urlStoreAndroid，a.name作为名称，a.description作为描述从**********.Entity.ApplicationEntity左联接a.applicationtranslationEntity.at.language.key=：语言顺序由a.id asc,a.name asc]

Answer 1

您正在使用name的分页属性，而它应该是applicationtranslationentities.name（属性路径）或a.name（根据连接路径）。