SpringData cascade update

Question

This is the first entity:

    @Entity
@Table(name = "photographers")
public class Photographer {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @NotNull
    @Column(name = "first_name")
    private String firstName;

    @NotNull
    @Size(min = 2, max = 50)
    @Column(name = "last_name")
    private String lastName;

    @Pattern(regexp = "^\\+[0-9]{1,3}/[0-9]{8,10}$")
    private String phone;

    @NotNull
    @OneToOne(optional = false)
    @JoinColumn(name = "primary_camera_id", referencedColumnName = "id")
    private BasicCamera primaryCamera;

    @NotNull
    @OneToOne(optional = false)
    @JoinColumn(name = "secondary_camera_id", referencedColumnName = "id")
    private BasicCamera secondaryCamera;

    @OneToMany(mappedBy = "owner")
    private Set<Lens> lenses;

    @OneToMany(mappedBy = "owner")
    private Set<Accessory> accessories;

and this is the other(lenses) :

@Entity
@Table(name = "lenses")
public class Lens {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    private String make;

    @Column(name = "focal_length")
    private Integer focalLength;

    @Column(name = "max_aperture", precision = 1)
    private Double maxAperture;

    @Column(name = "compatible_with")
    private String compatibleWith;

    @ManyToOne
    @JoinColumn(name = "owner_id", referencedColumnName = "id")
    private Photographer owner;

Firstly i have lenses without owners. Then i want to create a photographer with everything and set its lenses to exiting ones i do this with this code:

 for (Lens lens : lensSet) {
            lens.setOwner(photographer);
        }

        photographer.setPrimaryCamera(primaryCamera);
        photographer.setSecondaryCamera(secondaryCamera);
        photographer.setLenses(lensSet);

and when i save the photographer i want the lenses owner to be set to the created one. I tried cascad.MERGE on the OneToMany realation in the photographer entity but did't work and in the database all lenses owners are still nulls

there are no errors the entity is persisted in the database but the lenses are not updated When i tried cascade.All on OneToMany side this error occurred: detached entity passed to persist: exmaprep.model.Entity.Lens — Ivan Kirchev, Aug 12 '17 at 17:09
You have two independent entities (so called [aggregate root](https://stackoverflow.com/q/1958621)) - Photographer and Len. So you need to have repositories for both. First you save your lens, then add them to the photographer, then save the photographer. — Cepr0, Aug 12 '17 at 17:13

score 0 · Answer 1 · answered Aug 12 '17 at 17:22

I figured it out : i need to save the lenses AFTER i save the photographer:

for (Lens lens : lensSet) {
            lens.setOwner(photographer);
        }

        photographer.setPrimaryCamera(primaryCamera);
        photographer.setSecondaryCamera(secondaryCamera);
        photographer.setLenses(lensSet);


        this.photographerRepository.save(photographer);
        this.lensRepository.save(lensSet);

SpringData cascade update

1 Answers1