Question

Grails provides an isDirty method that can be called on domain objects. How would one modify the Grails domain model system, such that one could simply call a method, to find out if any domain objects are dirty.

I’m struggling with some “unsaved transient instance” errors that I haven’t been able to nail down, and it’d be great to know what’s dirty. Is there an elegant way to do this with groovy?

Answer 1

Add this to BootStrap.groovy:

import org.hibernate.Session

Session.metaClass.isDirty = { ->
   delegate.persistenceContext.entitiesByKey.values().any { it.isDirty() }
}

This adds an isDirty() method to Hibernate sessions that checks that top-level instances or instances in collections are dirty and you can use it with withSession, e.g.

boolean dirty = SomeDomainClass.withSession { session -> session.isDirty() }

or if you have access to the sessionFactory bean (e.g. from a def sessionFactory dependency injection)

boolean dirty = sessionFactory.currentSession.isDirty()