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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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