Symfony2/Doctrine2 One-To-Many same object twice - doctrine

Question

My current Client-Entity has an unloading and a loading Area, which are both ClientArea-Entities.
namespace ACME\DemoBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Sorien\DataGridBundle\Grid\Mapping as GRID;
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\Common\Collections\ArrayCollection;
/**
* ACME\DemoBundle\Entity\Client
*
* #ORM\Table()
* #ORM\Entity(repositoryClass="ACME\DemoBundle\Entity\ClientRepository")
*/
class Client
{
/**
* #ORM\OneToMany(targetEntity="ClientArea",mappedBy="client", cascade={"persist", "remove"})
*/
public $unloading_areas;
/**
* #ORM\OneToMany(targetEntity="ClientArea",mappedBy="client", cascade={"persist", "remove"})
*/
public $loading_areas;
}
class ClientArea
{
/**
* #ORM\ManyToOne(targetEntity="Client")
*/
public $client;
}
This does not work because client can only map 1 association.
How can i map the relation properly?

Answer 1

To create entity relations you need to have keys to use when joining tables. Your Client class should have an id key defined and you need to initialize collections, like this:
class Client
{
//....
/**
* #var integer $id
*
* #ORM\Column(name="id", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity="ClientArea", mappedBy="client", cascade={"persist", "remove"})
*/
public $unloading_areas;
/**
* #ORM\OneToMany(targetEntity="ClientArea", mappedBy="client", cascade={"persist", "remove"})
*/
public $loading_areas;
public function __construct() {
// Initialize collections
$this->unloading_areas = new \Doctrine\Common\Collections\ArrayCollection();
$this->loading_areas = new \Doctrine\Common\Collections\ArrayCollection();
}
// ....
}
Your ClientArea class should then look something like this:
class ClientArea
{
// ....
/**
* #ORM\Column(name="client_id", type="int", nullable=false)
*/
private $clientId;
/**
* #ORM\ManyToOne(targetEntity="Client")
* #JoinColumn(name="client_id", referencedColumnName="id")
*/
public $client;
// ....
}
Now, those two entities should be mapped correctly.
To learn more about association mappings in Doctrine, read article here: http://docs.doctrine-project.org/projects/doctrine-orm/en/2.0.x/reference/association-mapping.html
Hope this helps.