Question

我当前的Client-Entity有一个卸载区和一个加载区，它们都是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
{
enter code here/**
 * @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。我如何正确映射关系？

Answer 1

要创建实体关系，您需要在连接表时使用密钥。您的客户端类应定义id密钥，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();
    }

    // ....
}

您的ClientArea类应该如下所示：

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Doctrine中关联映射的更多信息，请阅读此处的文章：http://docs.doctrine-project.org/projects/doctrine-orm/en/2.0.x/reference/association-mapping.html

希望这有帮助。

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