如何定义这种多对多的教义关联?

时间:2011-10-11 06:41:41

标签: php mysql doctrine-orm

我有两个实体 - 用户&挑战。用户可以参与许多挑战,挑战可以有许多参与者(用户)。我开始通过在Users类上创建“多对多”关系来解决此问题:

/**
     * @ORM\ManytoMany(targetEntity="Challenge")
     * @ORM\JoinTable(name="users_challenges",joinColumns={@ORM\JoinColumn(name="user_id",referencedColumnName="id")},
     * inverseJoinColumns={@ORM\JoinColumn(name="challenge_id",referencedColumnName="id")})
     *
     */

    protected $challenges;

然而,我意识到我需要针对用户/挑战组合存储距离属性(用户在挑战中走了多远)。 Doctrine2文档声明:

“为什么多对多关联不太常见?因为经常要将其他属性与关联关联起来,在这种情况下,您会引入关联类。因此,直接的多对多关联会消失并被替换通过3个参与课程之间的一对多/多对一关联。“

所以我的问题是用户,挑战和用户挑战之间的这些关联应该是什么?

更新

有关实体代码的链接,请参阅第一个答案的评论。我有一个控制器方法,它总是创建一个新的UsersChallenges记录,而不是更新现有的记录(这是我想要的)

public function updateUserDistanceAction()
    {

      $request = $this->getRequest();
      $distance = $request->get('distance');
      $challenge_id = $request->get('challenge_id');


      if($request->isXmlHttpRequest()) {

        $em = $this->getDoctrine()->getEntityManager();
        $user = $this->get('security.context')->getToken()->getUser();
        $existingChallenges = $user->getChallenges();


        $challengeToUpdate = $em->getRepository('GymloopCoreBundle:Challenge')
                                ->find( (int) $challenge_id);

        if(!$challengeToUpdate) {

          throw $this->createNotFoundException('No challenge found');
        }

//does the challengeToUpdate exist in existingChallenges? If yes, update UsersChallenges with the distance
//if not, create a new USersChallenges object, set distance and flush

        if ( !$existingChallenges->isEmpty() && $existingChallenges->contains($challengeToUpdate)) {

          $userChallenge = $em->getRepository('GymloopCoreBundle:UsersChallenges')
                              ->findOneByChallengeId($challengeToUpdate->getId());

          $userChallenge->setDistance( $userChallenge->getDistance() + (int) $distance );
          $em->flush();

        } else {

          $newUserChallenge = new UsersChallenges();
          $newUserChallenge->setDistance($distance);
          $newUserChallenge->setChallenge($challengeToUpdate);
          $newUserChallenge->setUser($user);
          $user->addUsersChallenges($newUserChallenge);
          $em->persist($user);
          $em->persist($newUserChallenge);
          $em->flush();

        }

        //if success
        return new Response('success');

       //else

      }

    }

3 个答案:

答案 0 :(得分:8)

用户(一对多) - > UsersChallenges

UsersChallenges(多对一) - >用户

UsersChallenges(多对一) - >挑战

挑战(一对多) - > UsersChallenges

答案 1 :(得分:1)

我相信你需要在$em->persist($userChallenge);之前$em->flush();

$userChallenge->setDistance( $userChallenge->getDistance() + (int) $distance );
$em->persist($userChallenge);
$em->flush();

但是我不确定它是否能解决你的问题。

您可以在isEmpty

中发布containsexistingChallenges功能吗?

答案 2 :(得分:0)

此代码有效。一个问题是我正在测试UserChallenge集合是否包含一个显然会失败的Challenge对象。

工作代码:

if ( !$existingChallenges->isEmpty() ) {

          foreach($existingChallenges as $ec) {

           $existingChallengeIdArray[] = $ec->getId();
          }
        }

        if( in_array($challenge_id, $existingChallengeIdArray) ) {


          $userChallenge = $em->getRepository('GymloopCoreBundle:UsersChallenges')
                              ->findOneByChallenge($challengeToUpdate->getId());

          $userChallenge->setDistance( $userChallenge->getDistance() + (int) $distance );

          $em->flush();

        } else {

          $newUserChallenge = new UsersChallenges();
          $newUserChallenge->setDistance($distance);
          $newUserChallenge->setChallenge($challengeToUpdate);
          $newUserChallenge->setUser($user);
          $user->addUsersChallenges($newUserChallenge);
          $em->persist($newUserChallenge);
          $em->flush();

        }