Get maximum id inside Doctrine entity - symfony

Question

I need to get maximum ID of a table inside of symfony 2.7 entity. But instead of having the id I'm getting this issue.
Notice: Undefined property: AppBundle\Entity\BlogPost::$container
This is my BlogPost entity,
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\HttpFoundation\File\UploadedFile;
/**
* BlogPost
*
* #ORM\Table()
* #ORM\Entity
*/
class BlogPost {
const SERVER_PATH_TO_IMAGE_FOLDER = '/uploads';
/**
* #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)
*/
private $title;
/**
* #var string
*
* #ORM\Column(name="body", type="text")
*/
private $body;
/**
* #var string
*
* #ORM\Column(name="filename", type="text")
*/
private $filename;
/**
* Set filename
*
* #param string $filename
* #return BlogPost
*/
public function setFilename($filename) {
$this->filename = $filename;
return $this;
}
public function setUploader(UploadedFile $file) {
$em = $this->container->get('doctrine.orm.entity_manager');
$highest_id = $em->createQueryBuilder()
->select('MAX(b.id)')
->from('AppBundle:BlogPost', 'b')
->getQuery()
->getSingleScalarResult();
var_dump($highest_id);
exit();// exit for check value
$url = 'uploads/events';
$file_name = 'fsdf.' . $file->guessExtension();
$file->move($url, $file_name);
}
/**
* Get filename
*
* #return string
*/
public function getFilename() {
return $this->filename;
}
/**
* #var boolean
*
* #ORM\Column(name="draft", type="boolean")
*/
private $draft;
/**
* Get id
*
* #return integer
*/
public function getId() {
return $this->id;
}
/**
* Set title
*
* #param string $title
* #return BlogPost
*/
public function setTitle($title) {
$this->title = $title;
return $this;
}
/**
* Get title
*
* #return string
*/
public function getTitle() {
return $this->title;
}
/**
* Set body
*
* #param string $body
* #return BlogPost
*/
public function setBody($body) {
$this->body = $body;
return $this;
}
/**
* Get body
*
* #return string
*/
public function getBody() {
return $this->body;
}
/**
* Set draft
*
* #param boolean $draft
* #return BlogPost
*/
public function setDraft($draft) {
$this->draft = $draft;
return $this;
}
/**
* Get draft
*
* #return boolean
*/
public function getDraft() {
return $this->draft;
}
/**
* #ORM\ManyToOne(targetEntity="Category", inversedBy="blogPosts")
*/
private $category;
public function setCategory(Category $category) {
$this->category = $category;
}
public function getCategory() {
return $this->category;
}
/**
* Unmapped property to handle file uploads
*/
public $file;
/**
* Sets file.
*
* #param UploadedFile $file
*/
public function setFile(UploadedFile $file = null) {
$this->file = $file;
}
/**
* Get file.
*
* #return UploadedFile
*/
public function getFile() {
return $this->file;
}
/**
* Manages the copying of the file to the relevant place on the server
*/
public function upload() {
// the file property can be empty if the field is not required
if (null === $this->getFile()) {
return;
}
// we use the original file name here but you should
// sanitize it at least to avoid any security issues
// move takes the target directory and target filename as params
$this->getFile()->move(
self::SERVER_PATH_TO_IMAGE_FOLDER, $this->getFile()->getClientOriginalName()
);
// set the path property to the filename where you've saved the file
$this->filename = $this->getFile()->getClientOriginalName();
// clean up the file property as you won't need it anymore
$this->setFile(null);
}
/**
* Lifecycle callback to upload the file to the server
*/
public function lifecycleFileUpload() {
$this->upload();
}
/**
* Updates the hash value to force the preUpdate and postUpdate events to fire
*/
public function refreshUpdated() {
// $this->setUpdated(new \DateTime());
}
// ... the rest of your class lives under here, including the generated fields
// such as filename and updated
}
This is the part I'm trying to get max id,
public function setUploader(UploadedFile $file) {
$em = $this->container->get('doctrine.orm.entity_manager');
$highest_id = $em->createQueryBuilder()
->select('MAX(b.id)')
->from('AppBundle:BlogPost', 'b')
->getQuery()
->getSingleScalarResult();
var_dump($highest_id);
exit();// exit for check value
$url = 'uploads/events';
$file_name = 'fsdf.' . $file->guessExtension();
$file->move($url, $file_name);
}
With the help of comments and few research I figured out the issue is in 'entity_manager' part. Is there a way to call doctrine queries inside Entity?

Answer 1

If I were you, i would do something like that :
Controller:
$blogPost= new BlogPost () ;
$em = $this->getDoctrine()->getManager();
//..your code
// I assume you want to do that after a form post
$blogPost = $form->getData();
$id = $em->getRepository('AppBundle:BlogPost')->getMaxId();
$blogPost->setUploader($id);
//...
Repository:
public function getMaxId()
{
$qb = $this->createQueryBuilder('u');
$qb->select('u, MAX(id) as idMax');
return $qb->getQuery()->getSingleResult();
}
Entity:
public function setUploader(UploadedFile $file, $id)
{
var_dump($id);
$url = 'uploads/events';
$file_name = 'fsdf.'.$id.$file->guessExtension();
$file->move($url, $file_name);
}
It should work

Answer 2

I would suggest to hold the EntityManager as a class variable inside your Entity and either instantiate it via the constructor or via a setter-method which you call before you use the setUploader function.
This should be the cleanest and best readable solution.

Answer 3

Form another thread I found this and it's working for me.
global $kernel;
if ( 'AppCache' == get_class($kernel) )
{
$kernel = $kernel->getKernel();
}
$em = $kernel->getContainer()->get( 'doctrine.orm.entity_manager');
I can't use it in controller cause I have an admin class instead of controller on this. Since lot of people suggesting this using entity_manager inside entity is not good practice I'm using the code inside admin class instead of entity.
This is the original thread..
How to use entityManager inside Entity?

Answer 4

Try this in your Controller:
$blogPost= new BlogPost () ;
$em = $this->getDoctrine()->getManager();
$blogPost = $form->getData();
$maxId = $em->getRepository('AppBundle:BlogPost')->createQueryBuilder('b')
->where("MAX(b.id) as maxId")
->getQuery()
->getSingleResult();