Error trying flush an object in the database with Symfony2 - symfony

Question

I am new in Symfony2 (worked with Symfony 1 for several years) and I am trying to insert some records in a Entity with a relationship to another Entity, here are them:
<?php
namespace Jjj\SomeBundle\Entity;
use Gedmo\Mapping\Annotation as Gedmo;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Translatable\Translatable;
/**
* Jjj\SomeBundle\Entity
*
* #ORM\Table(name="content")
* #ORM\Entity(repositoryClass="Jjj\SomeBundle\Entity\ContentRepository")
*/
class Content implements Translatable
{
/**
*
* #ORM\Column(name="id", type="bigint", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
protected $id;
/**
* #ORM\ManyToOne(targetEntity="Category", inversedBy="contents")
* #ORM\JoinColumn(name="category_id", referencedColumnName="id")
*/
protected $category_id;
/**
* #Gedmo\Translatable
* #ORM\Column(name="title", type="string", length=32, nullable=false)
*/
protected $title;
/**
* #Gedmo\Translatable
* #ORM\Column(name="summary", type="text", nullable=true)
*/
protected $summary;
/**
* #Gedmo\Translatable
* #ORM\Column(name="fulltext", type="text", nullable=true)
*/
protected $fulltext;
/**
*
* #ORM\Column(name="created_at", type="datetime", nullable=true)
*/
protected $created_at;
/**
*
* #ORM\Column(name="updated_at", type="datetime", nullable=true)
*/
protected $updated_at;
/**
* #Gedmo\Slug(fields={"title"})
* #ORM\Column(length=128, unique=true)
*/
private $slug;
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set category_id
*
* #param integer $categoryId
* #return Content
*/
public function setCategoryId($categoryId)
{
$this->category_id = $categoryId;
return $this;
}
/**
* Get category_id
*
* #return integer
*/
public function getCategoryId()
{
return $this->category_id;
}
/**
* Set title
*
* #param string $title
* #return Content
*/
public function setTitle($title)
{
$this->title = $title;
return $this;
}
/**
* Get title
*
* #return string
*/
public function getTitle()
{
return $this->title;
}
/**
* Set slug
*
* #param string $slug
* #return Content
*/
public function setSlug($slug)
{
$this->slug = $slug;
return $this;
}
/**
* Get slug
*
* #return string
*/
public function getSlug()
{
return $this->slug;
}
/**
* Set summary
*
* #param string $summary
* #return Content
*/
public function setSummary($summary)
{
$this->summary = $summary;
return $this;
}
/**
* Get summary
*
* #return string
*/
public function getSummary()
{
return $this->summary;
}
/**
* Set fulltext
*
* #param string $fulltext
* #return Content
*/
public function setFulltext($fulltext)
{
$this->fulltext = $fulltext;
return $this;
}
/**
* Get fulltext
*
* #return string
*/
public function getFulltext()
{
return $this->fulltext;
}
/**
* Set created_at
*
* #param \DateTime $createdAt
* #return Content
*/
public function setCreatedAt($createdAt)
{
$this->created_at = $createdAt;
return $this;
}
/**
* Get created_at
*
* #return \DateTime
*/
public function getCreatedAt()
{
return $this->created_at;
}
/**
* Set updated_at
*
* #param \DateTime $updatedAt
* #return Content
*/
public function setUpdatedAt($updatedAt)
{
$this->updated_at = $updatedAt;
return $this;
}
/**
* Get updated_at
*
* #return \DateTime
*/
public function getUpdatedAt()
{
return $this->updated_at;
}
}
This is the Category Entity:
<?php
namespace Jjj\SomeBundle\Entity;
use Gedmo\Mapping\Annotation as Gedmo;
use Doctrine\ORM\Mapping as ORM;
/**
* Jjj\SomeBundle\Entity
*
* #ORM\Table(name="category")
* #ORM\Entity(repositoryClass="Jjj\SomeBundle\Entity\CategoryRepository")
*/
class Category
{
/**
* #var integer
*
* #ORM\Column(name="id", type="bigint", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
protected $id;
/**
* #var string
*
* #ORM\Column(name="title", type="string", length=32, nullable=false)
*/
protected $title;
/**
* #var string
*
* #ORM\Column(name="description", type="string", length=255, nullable=false)
*/
protected $description;
/**
* #var string
*
* #ORM\Column(name="created_at", type="datetime", nullable=false)
*/
protected $created_at;
/**
* #var string
*
* #ORM\Column(name="updated_at", type="datetime", nullable=false)
*/
protected $updated_at;
/**
* #Gedmo\Slug(fields={"title"})
* #ORM\Column(length=128, unique=true)
*/
private $slug;
/**
* #ORM\OneToMany(targetEntity="Content", mappedBy="category")
*/
protected $contents;
public function __construct()
{
$this->contents = new ArrayCollection();
}
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set title
*
* #param string $title
* #return Category
*/
public function setTitle($title)
{
$this->title = $title;
return $this;
}
/**
* Get title
*
* #return string
*/
public function getTitle()
{
return $this->title;
}
/**
* Set description
*
* #param string $description
* #return Category
*/
public function setDescription($description)
{
$this->description = $description;
return $this;
}
/**
* Get description
*
* #return string
*/
public function getDescription()
{
return $this->description;
}
/**
* Set created_at
*
* #param \DateTime $createdAt
* #return Category
*/
public function setCreatedAt($createdAt)
{
$this->created_at = $createdAt;
return $this;
}
/**
* Get created_at
*
* #return \DateTime
*/
public function getCreatedAt()
{
return $this->created_at;
}
/**
* Set updated_at
*
* #param \DateTime $updatedAt
* #return Category
*/
public function setUpdatedAt($updatedAt)
{
$this->updated_at = $updatedAt;
return $this;
}
/**
* Get updated_at
*
* #return \DateTime
*/
public function getUpdatedAt()
{
return $this->updated_at;
}
/**
* Set slug
*
* #param string $slug
* #return Category
*/
public function setSlug($slug)
{
$this->slug = $slug;
return $this;
}
/**
* Get slug
*
* #return string
*/
public function getSlug()
{
return $this->slug;
}
/**
* Add contents
*
* #param \Jaguar\AloBundle\Entity\Content $contents
* #return Category
*/
public function addContent(\Jaguar\AloBundle\Entity\Content $contents)
{
$this->contents[] = $contents;
return $this;
}
/**
* Remove contents
*
* #param \Jjj\SomeBundle\Entity\Content $contents
*/
public function removeContent(\Jjj\SomeBundle\Entity\Content $contents)
{
$this->contents->removeElement($contents);
}
/**
* Get contents
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getContents()
{
return $this->contents;
}
}
In the controller that is running, I wrote this:
$content = new Content();
$content->setTitle('Content Example');
$content->setSummary('Content Example');
$content->setFulltext('My first content...');
$content->setCategoryId(2);
$em = $this->getDoctrine()->getEntityManager();
$em->persist($content);
$em->flush();
The error says:
ContextErrorException: Warning: spl_object_hash() expects parameter 1 to be object, integer given in D:\xampp\htdocs\projects\alopatria\vendor\doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php line 1367
I was googling for a while but no luck found.
Any help, please?
Thanks!

Answer 1

You’re doing the mapping in Content.php in the wrong way.
If you’re setting a ManyToOne relation with the Category Entity, you should have a $category and not a $category_id attribute. You should deal with objects, and not integers.
Therefore, your Content Entity should look like this:
<?php
// Jjj\SomeBundle\Entity\Content.php
/**
* #ORM\ManyToOne(targetEntity="Category", inversedBy="contents")
* #ORM\JoinColumn(name="category_id", referencedColumnName="id")
*/
protected $category;
/**
* Set category
*
* #param \Jjj\SomeBundle\Entity\Category $category
* #return Content
*/
public function setCategory($category)
{
$this->category = $category;
return $this;
}
/**
* Get category
*
* #return category
*/
public function getCategory()
{
return $this->category;
}
And your controller like this:
<?php
$category = new Category();
//… $category->setTitle() and so on…
$content = new Content();
$content->setTitle('Content Example');
$content->setSummary('Content Example');
$content->setFulltext('My first content...');
$content->setCategory($category);
$em = $this->getDoctrine()->getEntityManager();
$em->persist($category);
$em->persist($content);
$em->flush();
You will then be able to access the id of a Category Entity (already fetched from database) with:
$categoryId = $category->getId();