Question

我对使用symfony3和学说的代码组织有疑问：我将尽力解释清楚。假设我有一个FootballClub实体：

class FootballClub
{
    // other code
    private $memberships;

    public function addMembership(Membership $membership) : FootballClub
    { 
       $this->memberships[] = $membership;
       return $this;

    }

    public function removeMembership(Membership $membership) : bool
    {
        return $this->memberships->removeElement($membership);
    }
}

该实体与另一个实体，即会员资格，具有多对一关系，代表球员与俱乐部之间的合同。假设每个俱乐部具有只能获取的有限数量的成员资格，该数目表示为设置，例如表示为设置实体中的属性。问题是：从俱乐部删除会员资格并检查是否受到尊重时，我应如何参考该设置？实体不应该有任何依赖关系，那么实现这一点的正确方法是什么？服务？你能提供一个例子吗？感谢您的时间。

Answer 1

您可以创建一个Settings实体，该实体与OneToOne实体具有FootballCluc关系。

定义这样的设置并在FootballClub的构造函数中实例化它

设置实体

/** @Entity */
class Settings
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="integer")
     */
    private $maxMembership;

    // Other configurable properties ... 

    __constructor($maxMembership = 50) 
    {
        $this->maxMembership = $maxMembership;
    }

    public function getMaxMembership()
    {
        return $this->maxMembership;
    }

    public function setMaxMembership($maxMembership)
    {
        $this->maxMembership = $maxMembership;
    }
}

足球实体

class FootballClub
{

    /**
     * One FootballClub has One Settings.
     * @OneToOne(targetEntity="Settings")
     * @JoinColumn(name="settings_id", referencedColumnName="id")
     */
    private $settings;

    // other code
    private $memberships;

    __constructor(Settings $settings = null)
    {
        if (null === $settings) {
            $settings = new Settings();
        }
        $this->settings = $settings;
    }

    public function addMembership(Membership $membership) : FootballClub
    { 
       if ($this->settings->getMaxMembership() <= count($this->memberships)) {
           // throw new Exception("Max number of membership reached"); Strict mode
           // return false  // soft mode
       }
       $this->memberships-> = $membership;
       return $this;

    }

    public function removeMembership(Membership $membership) : bool
    {
        return $this->memberships->removeElement($membership);
    }
}

实体symfony中的参考设置值

1 个答案: