Many to One Relation in Symfony 2 - symfony

Question

I have a problem related to Doctrine2:
1- I have two tables joining on a many-to-one relation:
Table 1 - Activity
The Schema:
Backend\adminBundle\Entity\Activity:
type: entity
table: activity
indexes:
result_id:
columns:
- result_id
id:
id:
type: integer
nullable: false
unsigned: false
comment: ''
id: true
generator:
strategy: IDENTITY
fields:
......
manyToOne:
result:
targetEntity: Actionresult
cascade: { }
mappedBy: null
inversedBy: null
joinColumns:
result_id:
referencedColumnName: id
orphanRemoval: false
The Entity
<?php
namespace Backend\adminBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
class Activity {
/**
* #var \Backend\adminBundle\Entity\Actionresult
*
* #ORM\ManyToOne(targetEntity="Backend\adminBundle\Entity\Actionresult")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="result_id", referencedColumnName="id")
* })
*/
private $result;
/**
* #var \Backend\adminBundle\Entity\SfGuardUser
*
* #ORM\ManyToOne(targetEntity="Backend\adminBundle\Entity\SfGuardUser")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
* })
*/
/* There are other Properties */
/**
* Set result
*
* #param \Backend\adminBundle\Entity\Actionresult $result
* #return Activity
*/
public function setResult(\Backend\adminBundle\Entity\Actionresult $result = null)
{
$this->result = $result;
return $this;
}
/**
* Get result
*
* #return \Backend\adminBundle\Entity\Actionresult
*/
public function getResult()
{
return $this->result;
}
}
Table 2 - Actionresult Related to Activity Table by Id:
The schema:
Backend\adminBundle\Entity\Actionresult:
type: entity
table: actionresult
id:
id:
type: integer
nullable: false
unsigned: false
comment: ''
id: true
generator:
strategy: IDENTITY
fields:
name:
type: string
nullable: false
length: 255
fixed: false
comment: ''
lifecycleCallbacks: { }
The Entity:
<?php
namespace Backend\adminBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* Actionresult
*
* #ORM\Table(name="actionresult")
* #ORM\Entity
*/
class Actionresult
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255, nullable=false)
*/
private $name;
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* #param string $name
* #return Actionresult
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* #return string
*/
public function getName()
{
return $this->name;
}
}
The Question:
With doctrine i can refer from table Activity to Actionresult with the name result.
How can i refer with doctrine from table Actionresult to Activity??
Thank you in advance.

Answer 1

To be thorough, you should try and stick to one type of entity mapping in Symfony whenever possible. The #ORM* annotations are redundant if you use YAML config, and vice-versa. I'll provide the answer using YAML, and I believe you'll be able to convert to annotations if need be.
# Activity.yml
Activity:
type: entity
...
manyToOne:
result:
targetEntity: ActionResult
inversedBy: activities
# ActionResult.yml
Result:
type: entity
oneToMany:
activities:
targetEntity: Activity
mappedBy: result
# ActionResult.php
class Result {
protected $activities;
public function __construct()
{
$this->activities = new Doctrine\Common\Collections\ArrayCollection();
}
public function getActivities()
{
return $this->activities;
}
public function addActivity(Activity $activity)
{
$activity->setResult($this);
$this->activities->add($activity);
}
public function removeActivity(Activity $activity)
{
$activity->setResult(null);
$this->activities->removeElement($activity);
}
}
# Activity.php
class Activity {
protected $result;
public function getResult()
{
return $this->result;
}
public function setResult(ActionResult $result = null)
{
$this->result = $result;
}
}
Reference:
Bidirectional one to many: http://doctrine-orm.readthedocs.org/en/latest/reference/association-mapping.html#one-to-many-bidirectional