Hibernate optimist locking code snippet #13

snippet.groovy

// Use any domain class
MyDomain.withTransaction { txn ->
    // Load objects
    def object = MyDomain.get(params.id)

    if (object.type == 'whatever') {
        // Discover we do need to make changes to the main object
        // Just discard what we had, we haven't changed it
        // and get the new locked version
        object = MyDomain.lock(params.id)
    
        // Again, the decisions we made about changing it may be
        // dependent on values we just refreshed from the DB
        // So check it again
        if (object.type == 'whatever') {
            // Make some changes
            object.property1 = 'hello'  
        }   
    }
}