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Lock Protection =============== Lock protection will prevent data corruption when multiple users edit an object at the same time. Example ------- 1) Alice starts to edit the object 2) Bob starts to edit the object 3) Alice submits the form 4) Bob submits the form In this case, a message will tell Bob that someone else has edited the object, and that he must reload the page and apply the changes again. Enable Lock Protection ---------------------- By default, lock protection is disabled. You can enable it in your ``sonata_admin`` configuration: .. configuration-block:: .. code-block:: yaml # config/packages/sonata_admin.yaml sonata_admin: options: lock_protection: true You must also configure each entity that you want to support by adding a field called ``$version`` on which the Doctrine ``Version`` feature is activated. Using Annotations:: // src/Entity/Car.php namespace App\Entity\Car; use Doctrine\ORM\Mapping as ORM; class Car { // ... /** * @ORM\Column(type="integer") * @ORM\Version */ protected $version; // ... } Using XML: .. code-block:: xml For more information about this visit the `Doctrine docs `_ .. note:: If the object model manager does not support object locking, the lock protection will not be triggered for the object. Currently, only the ``SonataDoctrineORMAdminBundle`` supports it.

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