abstract annotation for doctrine

Your abstract base class has to be anotated as Mapped Superclasses and include theHasLifecycleCallbacks-Annotation.
/**
 * @ORM\MappedSuperclass
 * @ORM\HasLifecycleCallbacks
 */
abstract class AbstractBase
{
    [...]

    /**
     * @ORM\PreUpdate
     */
    public function setUpdatedAt()
    {
        $this->updatedAt = new \DateTime();
    }
}

/**
 * @ORM\Entity(repositoryClass="Entity\Repository\UserRepository")
 * @ORM\Table(name="users")
 */
class User extends AbstractBase
{
    // some fields, relations and setters/getters defined here, these all work as expected.
}

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