原因：org.springframework.data.mapping.PropertyReferenceException：没有找到类型 Project 的属性 languageId

Question

我有两个实体类，如下所示。使用 JPARepository 如何找到ProjectByProjectIdAndLanguageId。

@Entity
public class ProjectDetails {

    @Id
    private int projectId;
    private String projectDescription;
    private int languageId;


}


@Entity
public class Project {

    @Id
    private int projectId;
    private String projectName;
    private LocalDate projectStartDate;
    private LocalDate projectEndDate;
    private String projectStatus;

    @OneToOne
    private ProjectDetails projectDetails;


}


@Repository
public interface ProjectRepository extends JpaRepository<Project, Integer> {

    public List<Project> findProjectByProjectIdAndLanguageId(int projectId , int languageId);

}

我在启动 Spring Boot 应用程序时遇到错误。

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property languageId found for type Project!

Answer 1

如果您想过滤不在聚合根目录上的属性，您必须提供完整路径。 以下应该可以工作。

public List<Project> findProjectByProjectIdAndProjectDetailsLanguageId(int projectId , int languageId);