NH 1.2.beta2
I was thinking if will be possibile to use NHibernate ORM layer to fetch a object with collections and many-to-one mappings, and then store the fetched object with a different Id, thus making a "copy and paste" operation.

I've not experimented, would be good to know if this could be a fine idea, eg. let's think about a User object with a Roles Collection: if i want clone the user admin

User u = es.Get<User>("admin);

u.Id = "AdminSecond";

es.SaveOrUpdate(), es.Save() or something different? How NHibernate could change the referenced keys accordingly?

thanks for any reply

Any Idea?
I've evaluated the possibility to Evict() the object, chenge the id in the object tree and SaveOrUpdate() the transient copy

No one has the same behiavour to manage?

what about implementing ICloneable? Then you could simply do something like:

User masterUser = es.Get<User>("admin");
User clonedUser = masterUser.Clone();
se.SaveOrUpdate(clonedUser);

The overridden ICloneable.Clone() method would implement a customized form of a deep copy without copying the ID field.

just off the top of my head...

an easy way to clone a object is to serialize it to a stream and then deserialize it. From our BaseModel:



You just have to ensure that your objects are seializable. In most cases using the [Serializable] attribute on class level will fit.

Regards
Klaus