加載Symfony2裝置時調用非成員函數的錯誤

Question

我正在用Symfony2實現經典的Blog應用程序，而「app/console doctrine：fixtures：load」會返回一個錯誤。我BlogFixtures.php文件是這樣的：

<?php 
namespace MGF\Bundles\WebBundle\DataFixtures\ORM; 

use Doctrine\Common\DataFixtures\AbstractFixture; 
use Doctrine\Common\DataFixtures\FixtureInterface; 
use Doctrine\Common\Persistence\ObjectManager; 
use MGF\Bundles\WebBundle\Entity\Blog; 
use MGF\Bundles\CRMBundle\Util\Util; 

class BlogFixtures extends AbstractFixture implements FixtureInterface 
{ 
    public function load(ObjectManager $em) 
    { 
     $blog1 = new Blog(); 

     $title = 'First post'; 
     $blog1->setTitle($title); 

     $slug1 = Util::getSlug($title); 
     $blog1->setSlug($slug1); 

     $blog1->setImage('beach.jpg'); 
     $blog1->setTags('symfony2, php, paradise, symblog'); 
     $blog1->setCreated(new \DateTime('now')); 
     $blog1->setUpdated($blog1->getCreated()); 

     $em->persist($blog1); 

     $author1 = $em->getRepository('MGFBCBundle:User')->findOneByUser('sarah'); 
     $author1->addBlog($blog1); 

     $em->persist($author1); 
     $em->flush(); 
    } 
} 

和錯誤：

app/console doctrine:fixtures:load 
Careful, database will be purged. Do you want to continue Y/N ?Y 
    > purging database 
    > loading MGF\Bundles\WebBundle\DataFixtures\ORM\BlogFixtures 
PHP Fatal error: Call to a member function addBlog() on a non-object in /var/www/METRO/src/MGF/Bundles/WebBundle/DataFixtures/ORM/BlogFixtures.php on line 33 

Fatal error: Call to a member function addBlog() on a non-object in /var/www/METRO/src/MGF/Bundles/WebBundle/DataFixtures/ORM/BlogFixtures.php on line 33 

我沒有看到我走到哪裏錯了。任何提示？

在此先感謝。

Answer 1

問題是，即使用戶'sarah'存在於固定裝置的數據庫中，當試圖再次加載燈具時，數據庫被清除。所以，我需要從燈具創建時引用我的用戶，並通過其引用檢索它們，因爲這裏說明：

http://symfony.com/doc/master/bundles/DoctrineFixturesBundle/index.html#sharing-objects-between-fixtures

賽程加載再次合作。