How to Retrieve Changed Entity Fields in Doctrine 2?

Retrieving Changed Entity Fields with Doctrine 2

When modifying an entity's state using setters, it is often useful to know which fields have been altered. Doctrine 2 provides a mechanism to retrieve this information.

To obtain the list of changed fields, follow these steps:

1. Get the Unit of Work

Start by retrieving the Unit of Work (UoW) associated with the Entity Manager:

$uow = $em->getUnitOfWork();

2. Compute Change Sets

Trigger the computation of change sets for the managed entities:

$uow->computeChangeSets();

3. Retrieve Entity Change Set

Use the UoW's getEntityChangeSet method to retrieve the specific changes made to the desired entity:

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

Note for PreUpdate Listeners:

If accessing changed fields within a preUpdate listener, do not recompute change sets as they have already been computed. Simply retrieve the change set directly.

Warning:

This solution is intended for use within Doctrine event listeners only and should not be employed outside this context. Doing so may disrupt Doctrine's normal behavior.

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