Question

目前我正在完成计算机科学学位，我正在学习英语。

我有一个问题是从Symfony3中的会话对象中获取名为Waiter的实体。

    $em = $this->getDoctrine()->getManager();
    $session = $this->get('Session'); 
    $waiter = $em->merge($session->get('waiter'));
    return $this->render('default/waitermngr.html.twig',array('admin'=>$waiter));

此代码返回错误EntityManager＃merge（）期望参数1为实体对象，给定NULL。

但$ session对象不为null，因为return new Response ((string)print_r($session));返回：

Symfony \ Component \ HttpFoundation \ Session \ Session Object（[storage：protected] =＆gt; Symfony \ Component \ HttpFoundation \ Session \ Storage \ NativeSessionStorage Object（[bags：protected] =＆gt; Array（[attributes] =＆gt; ; Symfony \ Component \ HttpFoundation \ Session \ Attribute \ AttributeBag Object（[name：Symfony \ Component \ HttpFoundation \ Session \ Attribute \ AttributeBag：private] =＆gt; attributes [storageKey：Symfony \ Component \ HttpFoundation \ Session \ Attribute \ AttributeBag： private] =＆gt; _sf2_attributes [attributes：protected] =＆gt;数组（[admin] =＆gt; AppBundle \ Entity \ Waiter对象（[idwaiter：protected] =＆gt; 21 [loginwaiter：protected] =＆gt;管理员[passwdwaiter： protected] =＆gt; 81dc9bdb52d04dc20036dbd8313ed055）））[flashes] =＆gt; Symfony \ Component \ HttpFoundation \ Session \ Flash \ FlashBag Object（[name：Symfony \ Component \ HttpFoundation \ Session \ Flash \ FlashBag：private] =＆gt;闪烁[闪烁：Symfony \ Component \ HttpFoundation \ Session \ Flash \ FlashBag：private] =＆gt; Array（）[storageKey：Symfony \ Component \ Ht tpFoundation \ Session \ Flash \ FlashBag：private] =＆gt; _sf2_flashes））[已启动：受保护] =＆gt; 1 [关闭：受保护] =＆gt; [saveHandler：protected] =＆gt; Symfony \ Component \ HttpFoundation \ Session \ Storage \ Proxy \ SessionHandlerProxy Object（[handler：protected] =＆gt; Symfony \ Component \ HttpFoundation \ Session \ Storage \ Handler \ NativeFileSessionHandler Object（）[wrapper：protected] =＆gt; 1 [saveHandlerName ：protected] =＆gt; files）[metadataBag：protected] =＆gt; Symfony \ Component \ HttpFoundation \ Session \ Storage \ MetadataBag Object（[name：Symfony \ Component \ HttpFoundation \ Session \ Storage \ MetadataBag：private] =＆gt; __metadata [storageKey：Symfony \ Component \ HttpFoundation \ Session \ Storage \ MetadataBag：private ] =＆gt; _sf2_meta [meta：protected] =＆gt;数组（[u] =＆gt; 1470214147 [c] =＆gt; 1470208976 [l] =＆gt; 0）[lastUsed：Symfony \ Component \ HttpFoundation \ Session \ Storage \ MetadataBag：private] =＆gt; 1470213715 [updateThreshold：Symfony \ Component \ HttpFoundation \ Session \ Storage \ MetadataBag：private] =＆gt; 0））[flashName：Symfony \ Component \ HttpFoundation \ Session \ Session：private] =＆gt;闪烁[attributeName：Symfony \ Component \ HttpFoundation \ Session \ Session：private] =＆gt;属性）1`

提前致谢！

Answer 1

非常感谢ShiraNai7，密钥存储名为'admin'而不是'服务员'

$session->set('admin',$waiter);

现在我得到了

$session->get('admin')

EntityManager＃merge（）期望参数1是实体对象，给定NULL。

1 个答案: