I'm new in Symfony2. I've a task to create blog. One of the necessary is displaying most popular posts. So I think that the best varient is create listener. It will be call, when visiter will read post. And listener will increment onе of the fild in database(MySQL). I create method in repository, which makes selection by this field. And also create Action, which renders posts by this selection. But when I try to read post, a have error:
FatalErrorException: Error: Call to a member function getId() on a non-object in /var/www/blo/src/Blog/Bundle/BlogBundle/EventListener/PostVisitedListener.php line 20.
Please, help me.
This my Entity (Post):
namespace Blog\Bundle\BlogBundle\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Gedmo\Mapping\Annotation as Gedmo;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
/**
* Post
*
* @ORM\Table(name="post")
* @ORM\Entity(repositoryClass="Blog\Bundle\BlogBundle\Entity\PostRepository")
*/
class Post
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var string
*
* @ORM\Column(name="title", type="string", length=255)
* @Assert\NotBlank
* @Assert\Length(min="13", max="255")
*/
private $title;
/**
* @var string
*
* @ORM\Column(name="author", type="string", length=100)
* @Assert\NotBlank
* @Assert\Length(min="13", max="100")
*/
private $author;
/**
* @var string
*
* @ORM\Column(name="post", type="text")
* @Assert\NotBlank
* @Assert\Length(min="100")
*/
private $post;
/**
* @var string
*
* @ORM\Column(name="image", type="string", length=100)
*/
private $image;
/**
* @Gedmo\Timestampable(on="create")
* @ORM\Column(name="createdAt", type="datetime")
*
*/
private $createdAt;
/**
*
* @ORM\Column(name="tags", type="text")
*/
private $tags;
/**
* @ORM\ManyToOne(targetEntity="Category", inversedBy="posts")
*/
private $category;
/**
* @ORM\OneToMany(targetEntity="Comment", mappedBy="post")
*/
private $comments;
/**
* @var integer
*
* @ORM\Column(name="visitedIncrement", type="integer")
*/
private $visitedIncrement;
public function __construct()
{
$this->comments = new ArrayCollection();
}
/**
* Get id
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set title
*
* @param string $title
* @return Post
*/
public function setTitle($title)
{
$this->title = $title;
return $this;
}
/**
* Get title
*
* @return string
*/
public function getTitle()
{
return $this->title;
}
/**
* Set author
*
* @param string $author
* @return Post
*/
public function setAuthor($author)
{
$this->author = $author;
return $this;
}
/**
* Get author
*
* @return string
*/
public function getAuthor()
{
return $this->author;
}
/**
* Set post
*
* @param string $post
* @return Post
*/
public function setPost($post)
{
$this->post = $post;
return $this;
}
/**
* Get post
*
* @return string
*/
public function getPost()
{
return $this->post;
}
/**
* Set image
*
* @param string $image
* @return Post
*/
public function setImage($image)
{
$this->image = $image;
return $this;
}
/**
* Get image
*
* @return string
*/
public function getImage()
{
return $this->image;
}
/**
* Set tags
*
* @param string $tags
* @return Post
*/
public function setTags($tags)
{
$this->tags = $tags;
return $this;
}
/**
* Get tags
*
* @return string
*/
public function getTags()
{
return $this->tags;
}
/**
* Set category
*
* @param $category
* @return $this
*/
public function setCategory($category)
{
$this->category = $category;
return $this;
}
/**
* Get category
*
* @return integer
*/
public function getCategory()
{
return $this->category;
}
/**
* Set comments
*
* @param string $comments
* @return Post
*/
public function setComments($comments)
{
$this->comments = $comments;
return $this;
}
/**
* Get comments
*
* @return string
*/
public function getComments()
{
return $this->comments;
}
/**
* @param \DateTime $createdAt
*/
public function setCreatedAt($createdAt)
{
$this->createdAt = $createdAt;
return $this;
}
/**
* @return \DateTime
*/
public function getCreatedAt()
{
return $this->createdAt;
}
/**
* @param int $visitedIncrement
*/
public function setVisitedIncrement($visitedIncrement)
{
$this->visitedIncrement = $visitedIncrement;
return $this;
}
/**
* @return int
*/
public function getVisitedIncrement()
{
return $this->visitedIncrement;
}
public function __toString()
{
return $this->getTitle();
}
}
This is my PostRepository
public function visitedIncrement($id)
{
$query = $this->getEntityManager()
->createQuery(
'UPDATE BlogBlogBundle:Post p
SET p.visitedIncrement = p.visitedIncrement + 1
WHERE p.id = :post_id')
->setParameter(':post_id', $id);
$query->execute();
This is my PostVisitedEvent
namespace Blog\Bundle\BlogBundle\Event;
use Blog\Bundle\BlogBundle\Entity\Post; use Symfony\Component\EventDispatcher\Event;
class PostVisitedEvent extends Event { protected $post;
/**
* @param Post $post
*/
public function setPost(Post $post)
{
return $this->post;
}
/**
* @return Post
*/
public function getPost()
{
return $this->post;
}
}
This is my PostVisitedListener
namespace Blog\Bundle\BlogBundle\EventListener;
use Blog\Bundle\BlogBundle\Entity\PostRepository;
use Doctrine\ORM\EntityManager;
use Blog\Bundle\BlogBundle\Event\PostVisitedEvent;
class PostVisitedListener
{
protected $repository;
public function __construct(PostRepository $repository)
{
$this->repository = $repository;
}
public function onPostVisited(PostVisitedEvent $event)
{
$this->repository->visitedIncrement($event->getPost()->getId());
}
This is my Action (it opens post and gives a opportunity to create comment): public function showPostAction($id) { $postRepository = $this->container->get('blog_blog_bundle.post.repository'); $post = $postRepository->find($id);
if (!$post) {
throw $this->createNotFoundException('The post is not found!');
}
$commentRepository = $this->container->get('blog_blog_bundle.comment.repository');
$comments = $commentRepository->findCommentForPost($post->getId());
$event = new PostVisitedEvent();
$event->setPost($post);
$eventDispatcher = $this->get('event_dispatcher');
$eventDispatcher->dispatch('blog_blog_bundle.post_visited', $event);
return $this->render('BlogBlogBundle:Default:showPost.html.twig', array(
'post' => $post,
'comments' => $comments,
));
}
Yuo can see, that I also create services for repositories and listener. There are:
service id="blog_blog_bundle.post.repository" class="Blog\Bundle\BlogBundle\Entity\PostRepository" factory-service="doctrine.orm.entity_manager" factory-method="getRepository"
argument>BlogBlogBundle:Post argument
service
service id="blog_blog_bundle.comment.repository" class="Blog\Bundle\BlogBundle\Entity\CommentRepository" factory-service="doctrine.orm.entity_manager" factory-method="getRepository"
argument BlogBlogBundle:Comment argument
service
service id="blog_blog_bundle.post_visited_listener" class="Blog\Bundle\BlogBundle\EventListener\PostVisitedListener"
argument type="service" id="blog_blog_bundle.post.repository"
tag name="kernel.event_listener" event="blog_blog_bundle.post_visited" method="onPostVisited"
service
Please, help me.
