One-to-Many relation not working - symfony

Question

I appear to be having a problem creating a simple One to Many relationship between my blog and my blog_link_tag join table. I'm almost there however I keep on receiving the following mapping error from Doctrine and I'm wondering if anyone can point out where I'm going wrong?
The association Acme\BlogBundle\Entity\Blog#tags refers to the owning side field Acme\BlogBundle\Entity\BlogLinkTag#blog_id which does not exist.
Below is the table structure I'm using with unnecessary fields removed.
CREATE TABLE `blog` (
`id` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `blog_link_tag` (
`id` int(3) NOT NULL AUTO_INCREMENT,
`blog_id` int(3) NOT NULL,
`tag_id` int(3) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Blog.php
<?php
namespace Acme\BlogBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;
use Symfony\Component\Validator\Constraints as Assert;
/**
* Blog
*
* #ORM\Table(name="blog")
* #ORM\Entity(repositoryClass="Acme\BlogBundle\Entity\BlogRepository")
* #ORM\HasLifecycleCallbacks
*/
class Blog {
/**
* #var integer
*
* #ORM\Column(name="id", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity="BlogLinkTag", mappedBy="blog_id")
*/
protected $tags;
public function __construct() {
$this->tags = new ArrayCollection();
}
/**
* Get id
*
* #return integer
*/
public function getId() {
return $this->id;
}
/**
* Add tags
*
* #param \Acme\BlogBundle\Entity\BlogLinkTag $tags
* #return Blog
*/
public function addTag(\Acme\BlogBundle\Entity\BlogLinkTag $tags) {
$this->tags[] = $tags;
return $this;
}
/**
* Remove tags
*
* #param \Acme\BlogBundle\Entity\BlogLinkTag $tags
*/
public function removeTag(\Acme\BlogBundle\Entity\BlogLinkTag $tags) {
$this->tags->removeElement($tags);
}
/**
* Get tags
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getTags() {
return $this->tags;
}
/**
* Set tags
*
* #param integer $tags
* #return Blog
*/
public function setTags($tags) {
$this->tags = $tags;
return $this;
}
}
BlogLinkTag.php
<?php
namespace Acme\BlogBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* BlogLinkTag
*
* #ORM\Table(name="blog_link_tag")
* #ORM\Entity
*/
class BlogLinkTag
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #var integer
* #ORM\Column(name="blog_id", type="integer", nullable=false)
* #ORM\ManyToOne(targetEntity="Blog", inversedBy="blog")
* #ORM\JoinColumn(name="blog_id", referencedColumnName="blog_id")
*/
private $blogId;
/**
* #var integer
*
* #ORM\Column(name="tag_id", type="integer", nullable=false)
*/
private $tagId;
/**
* Get id
*
* #return integer
*/
public function getId() {
return $this->id;
}
/**
* Set blogId
*
* #param integer $blogId
* #return BlogLinkTag
*/
public function setBlogId($blogId) {
$this->blogId = $blogId;
return $this;
}
/**
* Get blogId
*
* #return integer
*/
public function getBlogId() {
return $this->blogId;
}
/**
* Set tagId
*
* #param integer $tagId
* #return BlogLinkTag
*/
public function setTagId($tagId) {
$this->tagId = $tagId;
return $this;
}
/**
* Get tagId
*
* #return integer
*/
public function getTagId() {
return $this->tagId;
}
}

Answer 1

Take a look at the official documentation about association mapping here.
Try this :
In BlogLinkTag
/**
* #var integer
* #ORM\ManyToOne(targetEntity="Blog", inversedBy="tags") //put the name of the variable in the other entity here
* #ORM\JoinColumn(name="blog_id", referencedColumnName="id") //reference of the column targetted here
*/
private $blog;
In Blog :
/**
* #ORM\OneToMany(targetEntity="BlogLinkTag", mappedBy="blog") //put the name of the variable in the other entity here
*/
protected $tags;