Java – spring data rest JPA – unable to delay loading of onetomany bidirectional relationship

I have two entities, company and job, with one to many two-way relationship My problem is that I can't be lazy to load the company's list < job > work

For example, when I do this:

Get / API / companies / 1 this is the JSON response:

{
  "id": 1,"name": "foo",...
  "_embedded": {
    "jobs": [
      {...},...
      {...}
    ],"employees": [
      {...},{...}
    ]
  },"_links": {
    "self": {
      "href": "http://localhost:8080/api/companies/1"
    },"jobs": {
      "href": "http://localhost:8080/api/companies/1/jobs"
    },"employees": {
      "href": "http://localhost:8080/api/companies/1/employees"
    }
  }
}

I don't want to have_ Embedded, because I didn't set fetchtype = eagle This is my model:

Company. java

@Entity
public class Company {

    @Column(nullable = false,unique = true)
    private String name;


    @OneToMany(mappedBy = "company",fetch = FetchType.LAZY)
    private List<Job> jobs;

    ...

    public Company() {
    }

    ...

}

Job. java

@Entity
public class Job {

    @Column(nullable = false)
    public String title;

    @Column(length = 10000)
    public String description;

    @ManyToOne(fetch=FetchType.LAZY)
    private Company company;

    ...

    public Job() {
    }

    ...

}

As you can see, the same thing happens to other onetomany relationships (employees) Can I avoid returning to the entire job opening or employee list every time?

Edit: in terms of work, lazy load works normally! I didn't get a reply from the company related to my work I must definitely do / API / jobs / 123 / company to get the company

Edit2: forecast is only applicable to the set In this case, it's not what I need Excerpts work, but I want to avoid them I don't want to explicitly do / API / companies / 1? Projection = myprojection because I won't use multiple I want to change the default behavior, just like the projection in the collection

Editor 3: I tried this

@RestResource(exported = false)
@OneToMany(mappedBy = "company")
private List<Job> jobs;

I got an error. Multiple associated links with the same relationship type were detected! Disambiguation of association

It's really annoying. I just need to get rid of it_ embedded. what?

Solution

You can use entity graph Entity graph is used to override the extraction settings of attribute mapping at run time for example

@Repository
public interface GroupRepository extends CrudRepository<GroupInfo,String> {

  @EntityGraph(attributePaths = { "members" })
  GroupInfo getByGroupName(String name);

}

From the spring data JPA document "4.3.10. Configure fetch - and loadgraphs" https://docs.spring.io/spring-data/jpa/docs/current/reference/html/

In addition;