Symfony2/Doctrine2一对多相同对象两次

我当前的客户实体有一个卸载区和一个加载区，它们都是客户区实体

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;
}

这不起作用，因为客户端只能映射1个关联。

---

如何正确映射关系？

要创建实体关系，在连接表时需要使用键。您的客户机类应该定义了一个

id

键，您需要初始化集合，如下所示：

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();
    }

    // ....
}

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;

    // ....
}

然后，您的ClientArea类应该如下所示：

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();
    }

    // ....
}

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;

    // ....
}

现在，应该正确映射这两个实体。 要了解有关条令中关联映射的更多信息，请阅读本文：

希望这有帮助