Removing proxy part of grails domain object?

Question

I want to get at an actual instance of a domain object. That is, I need to serialize the object, and I'm trying to use the domain object on two sides of an httpinvoker chain. Is there a way to get a fully-loaded domain object that doesn't have any grails wiring, so that I can serialize it?

Answer 1

We do GrailsHibernateUtil.unwrapIfProxy(obj). It won't get rid of Grails injected methods and such - only of Hibernate/GORM proxy, but it should be sufficient.

edit:

1. Sorry for asking, but did you declare your domain class as implements Serializable?
2. It might be something you add/inject into your class, like in Grails non-bug 6379.
3. This piece of code (got it here) worked for me in grails console on a small domain class:

.

import org.codehaus.groovy.grails.orm.hibernate.cfg.GrailsHibernateUtil
import com.somegroup.domain.*

def loc = SomeDomainClass.get(1)
loc = GrailsHibernateUtil.unwrapIfProxy(loc)

ByteArrayOutputStream bos = new ByteArrayOutputStream()
ObjectOutput out = new ObjectOutputStream(bos)

out.writeObject(loc)
byte[] yourBytes = bos.toByteArray()

Answer 2

According to the second comment in the answer here explicitly unwrapping a proxy classes using GrailsHibernateUtil.unwrapIfProxy requires another database call. I have been using HibernateProxyHelper.getClassWithoutInitializingProxy to achieve the same result, and I'm pretty sure this does not make any extra database calls.