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我正在設置一個博客，並希望主頁顯示最新的博客條目，包括指向單個條目的鏈接。 我收到了列表中顯示的所有條目的鏈接，但我無法準確指出如何顯示單個條目。此外，我現在只要點擊鏈接，就會收到「找不到對象」異常。 這裏的控制器函數來顯示一個條目，其內容：Symfony 3找不到對象錯誤
<?php
// src/BlogBundle/Controller/BlogController.php
namespace BlogBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Security;
use BlogBundle\Entity\Blog;
use BlogBundle\Entity\User;
use BlogBundle\Form\BlogType;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Request;
class BlogController extends Controller
{
/**
* @Route("/blog", name="bloglist", requirements={"page": "\d+"})
*/
public function listAction()
{
$entry = $this->getDoctrine()->getRepository('BlogBundle:Blog')->findBy(array(), array('date' => 'DESC'));
dump($entry);
return $this->render('BlogBundle:blog:blog.html.twig', [
'bloglist' => $entry
]);
}
/**
* @Route("/blog/new", name="create")
*/
public function createAction(Request $request) {
$entry = new Blog();
$entry->setDate(new \DateTime('now'));
$entry->setAuthor($this->getUser());
$form = $this->createForm(BlogType::class, $entry);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$entry = $form->getData();
$em = $this->getDoctrine()->getManager();
$em->persist($entry);
$em->flush();
return $this->render('BlogBundle:blog:createsubmit.html.twig', array(
'entry' => $entry,
'form' => $form->createView(),
'success' => true
));
}
return $this->render('BlogBundle:blog:new.html.twig', array(
'quote' => 'New blog entry created!',
'form' => $form->createView(),
));
}
/**
* @Route("/blog/singleentry/{id}", name="singleentry", requirements={"id" = "\d+"}, defaults={"id" = 0})
*/
public function listSingleEntryAction(Request $request, Blog $blog)
{
$em = $this->getDoctrine()->getRepository('BlogBundle:Blog')->find($blog);
$form = $this->createForm(BlogType::class, $entry);
$form->handleRequest($request);
$em->persist($entry);
$em->flush();
return $this->render('BlogBundle:singleentry:edit.html.twig', array(
'entry' =>$entry,
'form' => $form->createView()
));
}
/**
* @Route("/blog/edit/{id}", name="entryedit", requirements={"id" = "\d+"}, defaults={"id" = 0})
*
*/
public function editAction(Request $request, Blog $blog) {
$em = $this->getDoctrine()->getManager();
$entry = $em->getRepository('BlogBundle:Blog')->find($blog);
if ($this->get('security.authorization_checker')->isGranted('ROLE_ADMIN') || $entry->getAuthor() == $this->getUser()->getUsername()) {
$form = $this->createForm(BlogType::class, $entry);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$em->persist($entry);
$em->flush();
return $this->render('BlogBundle:blog:editsubmit.html.twig', array(
'entry' => $entry,
'form' => $form->createView(),
'success' => true
));
}
return $this->render('BlogBundle:blog:edit.html.twig', array(
'form' => $form->createView(),
));
}
else {
echo '<div class="alert alert-danger alert-dismissable">
<span aria-hidden="true" data-dismiss="alert" class="close">×</span>
<h4>
<i class="fa fa-exclamation-circle "></i>
Only the author of an entry is allowed to edit it!</h4></div>';
return $this->listAction();
}
}
/**
* @Route("/blog/delete/{id}", name="entrydelete", requirements={"id" = "\d+"}, defaults={"id" = 0})
*
*/
public function deleteAction(Request $request, Blog $blog) {
$em = $this->getDoctrine()->getManager();
$entry = $em->getRepository('BlogBundle:Blog')->find($blog);
if ($this->get('security.authorization_checker')->isGranted('ROLE_ADMIN') || $entry->getAuthor() == $this->getUser()->getUsername()) {
$em->remove($entry);
$em->flush();
return $this->render('BlogBundle:blog:deletesubmit.html.twig');
}
else {
return $this->render('BlogBundle:blog:error.html.twig');
}
}
public function configureOptions(OptionsResolver $resolver) {
$resolver->setDefaults([
'data_class' => 'BlogBundle\Entity\Blog'
]);
}
}
?>
我的主頁：
<?php
namespace BlogBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
class DefaultController extends Controller {
/**
* @Route("/", name="welcome")
*/
public function indexAction() {
$entry = $this->getDoctrine()->getRepository('BlogBundle:Blog')->findBy(array(), array('date' => 'DESC'),5);
dump($entry);
return $this->render('BlogBundle:Default:index.html.twig', [
'Welcome' => 'Welcome!',
'avatar_url' => 'http://www.lufthansa.com/mediapool/jpg/45/media_789050645.jpg',
'blog' => $this->redirectToRoute('singleentry'),
'bloglist' => $entry
]);
}
}
?>
而這些都是樹枝模板，我嘗試呈現
singleentry.html。小枝：
{% extends '::base.html.twig' %}
{% block body %}
<div class="container">
<div class="col-md-11">
<h1 class="page-header">{{ blog. title }}</h1>
<div class="table">
<p><span class="fa fa-clock-o"></span> Posted on {{ blog.date|date('d.M Y H:i A') }} </p>
<p><span class="fa fa-user-circle"></span> Posted by {{ blog.author }} </p>
<p>{{ blog.text }}</p>
<!-- <a class="btn btn-primary" href="#">Read More <span class="glyphicon glyphicon-chevron-right"></span></a> -->
<button type="button" class="btn btn btn-info">
<a href="{{ path('entryedit', {'id':blog.id}) }}" style="color: #FEFEFE">Edit entry</a>
</button>
<button type="button" class="btn btn btn-warning">
<a href="{{ path('entrydelete', {'id':blog.id}) }}" style="color: #FEFEFE">Delete entry</a>
</button>
<hr>
</div>
</div>
</div>
{% endblock %}
我的主頁上的博客條目列表：
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title text-center">My latest blog entries</h3>
</div>
<table class="table">
{% for blog in bloglist %}
<tr>
<td><a href="{{ path('singleentry') }}">{{ blog.title }}</a></td>
<td width="85%" style="max-width: 0;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;">
{{ blog.text }}
</td>
</tr>
{% endfor %}
</table>
</div>
編輯版本listSingleEntryAction的 - >對象顯示爲NULL
public function listSingleEntryAction(Request $request, $id)
{
$em = $this->getDoctrine()->getManager();
$entry = $em->getRepository('BlogBundle:Blog')->find($id);
if($entry == null)
{
$message='Entry does not exist';
return $this->render('BlogBundle:blog:error.html.twig');
}
return $this->render('BlogBundle:blog:singleentry.html.twig', Array(
'entry' => $entry,
'success' => true,
));
}
我試過了，但它沒有改變一件事，不幸的是！實際上，我的編輯和刪除操作正在工作：/ – sonja
我現在改變了它，但每次嘗試選擇對象時都說對象不存在。 – sonja
另一個問題是find方法會返回一個實體。您將它分配給em變量，然後使用條目。我認爲你應該改變進入 – Vladislav