Question

I have the following model (playframework):

@Entity
public class Album extends Model{

    public Album(){
        this.creationDate = new Date();
    }

    public Album(String name){
        this.creationDate = new Date();
        this.name = name;
    }

    @Required
    @Column(unique = true)
    public String name;
    @Temporal(javax.persistence.TemporalType.DATE)
    public Date creationDate;
    @OneToMany(cascade=CascadeType.ALL, mappedBy="album")
    @OrderColumn(name="position")
    public List<Image> images = new ArrayList<Image>();    
}

and:

@Entity
public class Image extends Model {

    public Image(String description) {
        this.description= description;
    }
    @Required
    public String description;
    @Required
    @ManyToOne
    @JoinColumn(name="album_id", nullable=false)
    public Album album;
    @Column(name="position")
    public int position;

    public void addAlbum(Album album){
        this.album = album;
        album.images.add(this);
    }
}

In my tests I do the following:

@Test
public void indexColumn(){
    Album album = new Album("newalbum");
    Image image1 = new Image("newimage1");
    Image image2 = new Image("newimage2");
    image1.addAlbum(album);
    image2.addAlbum(album);
    album.save();

}

When I look at the DB, I can see that position is 0 for both images. I think I did exactly that what’s in the hibernate doc Hibernate Documentation, but it is not working. So I am wondering if this is not working in combination with play framework.

Any Ideas?

BR, Rene

Answer 1

I finally found a working solution here:

@Entity
public class Album extends Model{

    public Album(){
        this.creationDate = new Date();
    }

    public Album(String name){
        this.creationDate = new Date();
        this.name = name;
    }

    @Required
    @Column(unique = true)
    public String name;
    @Temporal(javax.persistence.TemporalType.DATE)
    public Date creationDate;
    @OneToMany(cascade=CascadeType.ALL, mappedBy="album")
    @OrderColumn(name="position_index")
    public List<Image> images = new ArrayList<Image>();    
}

and

@Entity
public class Image extends Model {

    public Image(String description) {
        this.description= description;
    }
    @Required
    public String description;
    @Required
    @ManyToOne
    public Album album;

    public void addAlbum(Album album){
        this.album = album;
        album.images.add(this);
    }
}

With that mapping Hibernate creates a new Table: album_image which contains album_id,images_id and position_index, this time updated corresponding to the values in the list.