Sonata Admin子管理员从列表中消失

Question

我有管理课程

class LogAdmin extends AbstractAdmin
{

 public function getParentAssociationMapping()
    {
        $em = $this->modelManager->getEntityManager('acme\Bundle\Entity\acme');
        $className =      $em->getClassMetadata(get_class($this->getParent()->getObject($this->getParent()->getRequest()->get('id'))))->getTableName();

        return strtolower( $className );
    }
  protected function configureRoutes(RouteCollection $collection)
    {

        if ($this->isChild()) {
            return;
        }


        // This is the route configuration as a parent
        $collection->clear();

    }

在sonata_admin.yml中

dashboard: 
  groups:
   settings: 
     -mea.log.sonata.admin.log

服务：

  mea.log.sonata.admin.log:
    class: AppBundle\Sonata\Admin\LogAdmin
    arguments: [~, AppBundle\Entity\Log, ~]
    tags:
      - { name: sonata.admin, manager_type: orm, label: "Logs" }
    public: true


envio.admin.packet:
    class: AppBundle\Sonata\Admin\PacketAdmin
    arguments: [~, AppBundle\Entity\Packet, ~]
    tags:
    - { name: sonata.admin, manager_type: orm, label: Packet }
    public: true
    calls:
      - [ addChild, ['@mea.log.sonata.admin.log', 'packet']]
      - [ addChild, ['@mea.postbox.sonata.admin.thread', 'packet']]
      - [ addChild, ['@envio.admin.shipment', 'packet']]

当我发表评论

// $collection->clear();

在奏鸣曲仪表板中，我看到日志

我删除评论时

 $collection->clear();

日志菜单消失。可以将独立面板日志和日志作为子级吗？我需要克隆此管理类吗？