@PreUpdate not invoked when updating a @ManyToMany collection

[Oded Peer]

Hi,

I have a base class:
@MappedSuperclass
public abstract class BaseConfigurationModel extends Model {
@Temporal(value=TemporalType.TIMESTAMP)
public Date lastChangeDate;

@PrePersist
@PreUpdate
public void updateLastChangeDate() {
lastChangeDate = new Date();
dirty = true;
}
}

and an entity:
@Entity
public class Post extends BaseConfigurationModel
{
public String name;

@ManyToMany
public Set<Comments> comments = new HashSet<Comments>();
}

I am using the CRUD module to create and update Posts.
When I update the "name" field the updateLastChangeDate() is invoked,
but when I add or remove elements from the "comments" set the
updateLastChangeDate() is not invoked.
I understand why this happens (http://stackoverflow.com/questions/
1786343/preupdate-not-firing-when-adding-to-a-collection) but I wanted
to know if you have any recommendations as to how this can be done
with Play.
Should I use Hibernate interceptors? Is there a generic JPA solution?

Thanks

[Guillaume Bort]

You could just override the save() method in your object:

public BaseConfigurationModel save() {
// ... udpate your object here
return super.save();
}

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