Spring数据mongoDB：使用Example Executor和Pageable通过子对象ID查找所有对象

问题描述

我在查询存储库时遇到问题，该存储库只能通过子对象ID，示例和Pageable进行查找。

StudentController.java

@RestController
@RequestMapping("/students")
public class StudentController {
    @Autowired
    private StudentService studentService;
    
    @RequestMapping(method = RequestMethod.GET)
    public Page<Student> getStudentsPage(
            @PageableDefault(page = 0,size = 10) @SortDefault.sortDefaults({
                    @SortDefault(sort = "id",direction = Direction.DESC) }) Pageable pageable,Student student) {
        return studentService.getStudentPage(student,pageable);
    } 
}

StudentService.java

@Service
public class StudentService {
    private static final Logger logger = LoggerFactory.getLogger(StudentService.class);    
    @Autowired
    private UserService userService;
    
    @Autowired
    private StudentRepository studentRepository;
    
    public Page<Student> getStudentsPage(Student student,Pageable pageable) {
        logger.debug("Getting Students : {},{}",student,pageable);
        //gets organization Id of the student from the session
        String organizationId = userService.getUserMe().getorganization().getId(); 
        Page<Student> studentPage = studentRepository.findAllByOrganizationId(organizationId,Example.of(student),pageable);
        
        logger.debug("Students: {}",studentPage.getContent());
        return studentPage;
    }
}

StudentRepository.java

@Repository
public interface StudentRepository extends MongoRepository<Student,String> {    
    Page<Student> findAllByOrganizationId(String organizationId,Example<Student> example,Pageable pageable);
    
}

Student.java

@Document(collection = "students")
public class Student {
    @Id
    private String       id;
    private String       firstName;
    private String       lastName;
    @DBRef(db = "organizations")
    private Organization organization;
    
    public String getId() {
        return id;
    }
    
    public void setId(String id) {
        this.id = id;
    }
    
    public String getFirstName() {
        return firstName;
    }
    
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    
    public String getLastName() {
        return lastName;
    }
    
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    
    public Organization getorganization() {
        return organization;
    }
    
    public void setorganization(Organization organization) {
        this.organization = organization;
    }
    
    @Override
    public String toString() {
        return "Student [id=" + id + ",firstName=" + firstName + ",lastName=" + lastName + ",organization="
               + organization + "]";
    }
    
}

Organization.java

@Document(collection = "organizations")
public class Organization {
    @Id
    private String id;
    private String name;
    
    public String getId() {
        return id;
    }
    
    public void setId(String id) {
        this.id = id;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    @Override
    public String toString() {
        return "Organization [id=" + id + ",name=" + name + "]";
    }
    
}

GET API请求： http：// localhost：8080 / students？page = 0＆size = 10＆sort = id，desc＆lastName = xyz

存储库方法 页面findAllByOrganizationId（字符串OrganizationId，示例示例，Pageable pageable）; 应该返回所有具有匹配的OrganizationId和lastName = xyz的记录，但是它将返回与组织ID匹配的记录以及所有学生，而与lastName无关。

代码有问题吗？

谢谢！

解决方法

最终找到答案。 findBy和Example Executor不能一起使用。

如下所示，通过示例执行器设置子对象过滤器和查询。

public Page<Student> getStudentsPage(Student student,Pageable pageable) {
        logger.debug("Getting Students : {},{}",student,pageable);
        //gets organization Id of the student from the session
        String organizationId = userService.getUserMe().getOrganization().getId(); 
        student.setOrganization(new Organization(organizationId));
        Page<Student> studentPage = studentRepository.findAll(Example.of(student),pageable);
        
        logger.debug("Students: {}",studentPage.getContent());
        return studentPage;
    }    

这按预期工作！

谢谢！