copy child collection to another object
- by Bogdan
Hi everyone,
I have a one-to-many relationship between Part and Params (a "Part" has many "Params).
I'm trying to do something naive like this:
Part sourcePart = em.find(Part.class, partIdSource);
Part destPart = em.find(Part.class, partIdDest);
Collection<Param> paramListSource = sourcePart.getParamList();
destPart.setParamList(paramListSource);
Basically I want to copy all the parameters from sourcePart to destPart. Hopefully the persistence provider will automatically set the right foreign keys in the Param table/entity.
The above code will obviously not work.
Is there any easy way of doing this, or do I have to do create a new collection, then add each Param (creating new Param, setting attributes, etc) ?
