加载 Symfony2 灯具时出现错误"Call to a member function on a non-object"

Question

我正在使用Symfony2实现经典博客应用程序，并且"app/console学说:fixtures:load"返回错误。我的BlogFixtures.php文件是这样的:

<?php
namespace MGFBundlesWebBundleDataFixturesORM;
use DoctrineCommonDataFixturesAbstractFixture;
use DoctrineCommonDataFixturesFixtureInterface;
use DoctrineCommonPersistenceObjectManager;
use MGFBundlesWebBundleEntityBlog;
use MGFBundlesCRMBundleUtilUtil;
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();
    }
}

和错误:

app/console doctrine:fixtures:load
Careful, database will be purged. Do you want to continue Y/N ?Y
  > purging database
  > loading MGFBundlesWebBundleDataFixturesORMBlogFixtures
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

我不知道我错在哪里。有提示吗?

Answer 1

问题是，即使用户'sarah'存在于来自fixture的db中，当试图再次加载fixture时，db被清除。因此，我需要在从fixture创建用户时引用它们，并通过它们的引用检索它们，如下所示:

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

设备加载正常