Finding out what changed via postUpdate listener in Symfony 2.1

Question

I have a postUpdate listener and I\'d like to know what the values were prior to the update and what the values for the DB entry were after the update. Is there a way to do this

Answer 1

Your Entitiy:

/**
 * Order
 *
 * @ORM\Table(name="order")
 * @ORM\Entity()
 * @ORM\EntityListeners(
 *     {"\EventListeners\OrderListener"}
 * )
 */
class Order
{
...

Your listener:

class OrderListener
{
    protected $needsFlush = false;
    protected $fields = false;

    public function preUpdate($entity, LifecycleEventArgs $eventArgs)
    {
        if (!$this->isCorrectObject($entity)) {
            return null;
        }

        return $this->setFields($entity, $eventArgs);
    }


    public function postUpdate($entity, LifecycleEventArgs $eventArgs)
    {
        if (!$this->isCorrectObject($entity)) {
            return null;
        }

        foreach ($this->fields as $field => $detail) {
            echo $field. ' was  ' . $detail[0]
                       . ' and is now ' . $detail[1];

            //this is where you would save something
        }

        $eventArgs->getEntityManager()->flush();

        return true;
    }

    public function setFields($entity, LifecycleEventArgs $eventArgs)
    {
        $this->fields = array_diff_key(
            $eventArgs->getEntityChangeSet(),
            [ 'modified'=>0 ]
        );

        return true;
    }

    public function isCorrectObject($entity)
    {
        return $entity instanceof Order;
    }
}