Symfony2的ContainerAware未能得到元素

Question

我試圖使用的EntityManager從我的自定義類內的實體獲取數據，但我得到這個錯誤

Error: Call to a member function get() on a non-object on line 28

我不知道爲什麼$this->container有沒有子元素，我延長ContainerAware ...

這是我的代碼

<?php 
namespace WhiteBear\UsersBundle\Security; 
use Symfony\Component\Security\Core\Role\RoleInterface; 
use Symfony\Component\Security\Core\User\UserInterface; 
use Symfony\Component\DependencyInjection\ContainerAware; 
use WhiteBear\CustomerPortalBundle\Entity\VtigerContactdetails; 
use WhiteBear\CustomerPortalBundle\Entity\VtigerContactscf; 
class UserDependentRole extends ContainerAware implements RoleInterface 
{ 
    private $user; 

    public function __construct(UserInterface $user) 
    { 
     $this->user = $user; 
    } 

    public function getRole() 
    { 
     $rol = $this->getEntityManager()->getRepository('WhiteBearCustomerPortalBundle:VtigerContactscf') 
     ->findBy(array(
       'contactid' => $this->user->getId() 
     )); 
     $role = $rol['groups'] == '1' ? "AGENT" : "USER"; 
     return 'ROLE_' . strtoupper($role); 
    } 

    public function getEntityManager() { 
     return $this->container->get('doctrine')->getEntityManager(); 
    } 
} 

編輯還與嘗試只能通過services.yml注入doctrine2

<?php 
namespace WhiteBear\UsersBundle\Security; 
use Symfony\Component\Security\Core\Role\RoleInterface; 
use Symfony\Component\Security\Core\User\UserInterface; 

use Doctrine\ORM\EntityManager; 

use WhiteBear\CustomerPortalBundle\Entity\VtigerContactdetails; 
use WhiteBear\CustomerPortalBundle\Entity\VtigerContactscf; 
class UserDependentRole implements RoleInterface 
{ 
    private $user; 
    private $em; 

    public function __construct(UserInterface $user, EntityManager $em) 
    { 
     $this->user = $user; 
     $this->em = $em; 
    } 

    public function getRole() 
    { 
     $rol = $this->em->getRepository('WhiteBearCustomerPortalBundle:VtigerContactscf') 
     ->findBy(array(
       'contactid' => $this->user->getId() 
     )); 
     $role = $rol['groups'] == '1' ? "AGENT" : "USER"; 
     return 'ROLE_' . strtoupper($role); 
    } 
} 

services.yml

services: 
    white_bear.userdepend: 
     class: WhiteBear\CustomerPortal\Security\UserDependentRole 
     arguments: [@doctrine.orm.entity_manager] 

但正如我打電話從實體這個班，我得到這個錯誤

Catchable Fatal Error: Argument 2 passed to WhiteBear\UsersBundle\Security\UserDependentRole::__construct() must be an instance of Doctrine\ORM\EntityManager, none given

這因爲從我的實體我這樣做，因爲我不知道如何讓EntityManager解析成構造函數...

/** 
* @inheritDoc 
*/ 
public function getRoles() { 
    return array(new UserDependentRole($this)); 
} 

Answer 1

您必須通過setter provided by the ContainerAware class注入容器。

這裏您可以管理這種通過DIC注射的方式，

your_service_id: 
    class: Path_to_your_service_class 
    calls: 
     - [setContainer, ['@service_container']] 

但

當你只是針對實體管理器，你不需要使你的類容器感知。只有當您的服務依賴於一組其他服務（這裏不是這種情況）時，才應該注入容器。

那麼請考慮僅注入doctrine.orm.entity_manager服務。 Check this relevant Example.