(Quick Reference) ## getPersistentValue ### Purpose Retrieve the original value of a field for a domain class instance. ### Examples
    def b = Book.get(1)
    someMethodThatMightModifyTheInstance(b)

    if (b.isDirty('name')) {
        def currentName = b.name
        def originalName = b.getPersistentValue('name')
        if (currentName != originalName) {
            ...
        }
    }
### Description This method is useful mostly for audit logging or other work done in a beforeUpdate event callback. Hibernate caches the original state of all loaded instances for dirty checking during a flush and this method exposes that data so you can compare it with the current state. | Quick Reference (hide)