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(Quick Reference)

attach

Purpose

Associates a "detached" domain instance with the current Hibernate session

Examples

def b = Book.get(1)
b.title = "Blah"
b.save(flush:true)

b.discard()

...
if (!b.isAttached()) {
    b.attach()
}

Description

Hibernate manages persistent instances in a persistence Session. A new Session is created per request and is closed at the end of the request. If an object is retrieved from the Session and placed into a web scope such as the HttpSession it will be "detached" from the Hibernate Session once the Session is closed and discarded. You can use the attach() method to re-attach an existing persistent instance to the persistence Session of the current request.