How to Track Entity Changes in Doctrine 2?

Tracking Entity Changes in Doctrine 2

Doctrine 2 provides a way to track the changed fields of an entity using the EntityManager and UnitOfWork.

Suppose you have an entity $e and modify its fields:

$e->setFoo('a');
$e->setBar('b');

To retrieve an array of changed fields:

1. Obtain the UnitOfWork:

   $uow = $em->getUnitOfWork();

2. Compute Changes:

   $uow->computeChangeSets();

3. Get Entity Changes:

   $changeset = $uow->getEntityChangeSet($e);

The $changeset will contain all modified attribute-value pairs:

[
    'foo' => ['old' => 'oldFoo', 'new' => 'a'],
    'bar' => ['old' => 'oldBar', 'new' => 'b'],
]

Note for PreUpdate Listeners:

If attempting to retrieve updated fields within a preUpdate listener, skip the change set computation as it has already occurred. Simply call getEntityChangeSet to retrieve the changes.

Warning:

Using this method outside of Doctrine event listeners can disrupt its operation.

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