How to returnDTO instead of entity in Spring boot pagination?

Question

My DTO is different from entity. How can I return a DTO instead of entity with pagination while still showing information of all pages?

Controller:

@GetMapping("/{name}")
public Page<Student> getStudent(@PathVariable(value = "name") String name, Pageable pageable){
     Page <Student> page = studentService.getStudent(name, pageable);
     return page;
}

Service:

public Page<Student> getStudent(String name, Pageable pageable){
    Page<Student> students = studentRepository.findAllByName(name, pageable);
    return students;
}

Repository:

@Repository
public interface StudentRepository extends 
    PagingAndSortingRepository<Student, Long> {
    Page<Student> findAllByName(String name, Pageable pageable);
}

DTO:

@Data
public class StudentDTO extends ResourceSupport {
   Long _id;
   String name;
}

Entity:

@Entity
@Data
@NoArgsConstructor(force = true, access = AccessLevel.PUBLIC)
public class Student {

    @Id
    @GeneratedValue
    private Long id;
    private String name;
    private Long grade;
}

You may be interested in some of the support in Spring HATEOAS, particularly `ResourceAssembler`. — chrylis -cautiouslyoptimistic-, Oct 04 '18 at 14:02
Possible duplicate of [How to work with DTO in Spring Data REST projects?](https://stackoverflow.com/questions/45401734/how-to-work-with-dto-in-spring-data-rest-projects) — tmarwen, Oct 04 '18 at 14:18

TomVW · Accepted Answer · 2018-10-04T14:20:36.423

9

The StudentDTO class can have a constructor with a Student parameter.

public StudentDTO(Student student) {
    this._id = student.getId();
    this.name = student.getName();
}

Then you can call map on the Page object.

Page<StudentDTO> dtoPage = page.map(student -> new StudentDTO(student));

edited Oct 04 '18 at 14:20

answered Oct 04 '18 at 14:06

TomVW

1,510
13
26

1

You can use method reference in this case: `Page dtoPage = page.map(StudentDTO::new);` – Benoit Oct 04 '18 at 14:29

score 1 · Answer 2 · answered Oct 04 '18 at 14:11

1

Please look here - this is an approach of how to work with DTO in Spring Data REST projects

answered Oct 04 '18 at 14:11

Anna van den Akker

670
5
8

score 1 · Answer 3 · answered Oct 04 '18 at 14:19

You can do as follows:

 @Query("SELECT new StudentDTO(student.id, student.name) FROM Student student "
            + "WHERE student.name like :name ")
    List<StudentDTO> findAllCustomBy(@Param("name") String name)

and then you create a Constructor inside StudentDto

   public class StudentDto {
        public StudentDto(Long id, String name){
          this.id = id;
          this.name = name;
        }

score 0 · Answer 4 · answered Sep 28 '20 at 14:36

0

Pageable pageable = PageRequest.of(pageNo,PAGE_SIZE_12);
Page<StudentDTO> studentDTO = new PageImpl<>(studentDTO ,pageable,studentDTO.size());

answered Sep 28 '20 at 14:36

Rajesh Bhushan

61
1
1
12

4

Please don't post only code as answer, but also provide an explanation what your code does and how it solves the problem of the question. Answers with an explanation are usually more helpful and of better quality, and are more likely to attract upvotes. – Mark Rotteveel Sep 28 '20 at 14:55

How to returnDTO instead of entity in Spring boot pagination?

4 Answers4