错误：必须管理传递给选择字段的实体

Question

首先：我得到的错误是：必须管理传递给选择字段的实体

我有这些实体： - 用户（属于一个或多个团队） - 团队（有一个或 2 个用户） - 挑战（有 2 个团队）

我想构建一个 ChallengeType 表单，用户可以在其中填写两个团队的两个用户并创建挑战。我想我需要一个嵌入式表单。

我制作了一个 TeamType Form 类：（我希望从中获得一个选择框，其中列出了所有用户）

<?php

namespace Tennisconnect\DashboardBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class TeamType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder->add('players', 'entity', array(
            'class' => 'TennisconnectUserBundle:User',
            'multiple' => true
        ));
    }

    public function getName()
    {
        return 'team';
    }

    public function getDefaultOptions(array $options)
    {
        return array('data_class' => 'Tennisconnect\DashboardBundle\Entity\Team');
    }
}

这是 ChallengeType 表单类：

<?php

namespace Tennisconnect\DashboardBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class ChallengeType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder->add('teams', 'collection', array('type' => new TeamType()));
    }

    public function getName()
    {
        return 'challenge';
    }

    public function getDefaultOptions(array $options)
    {
        return array('data_class' => 'Tennisconnect\DashboardBundle\Entity\Challenge');
    }
}

挑战实体：

namespace Tennisconnect\DashboardBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Tennisconnect\DashboardBundle\Entity\Team;
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\Common\Collections\ArrayCollection;

/**
* @ORM\Entity
* @ORM\Table(name="challenge")
*/
class Challenge
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\ManyToMany(targetEntity="Team", mappedBy="teams")
     */
    protected $teams;

    public function __construct()
    {
        $this->teams = new ArrayCollection();
    }

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Add teams
     *
     * @param Tennisconnect\DashboardBundle\Entity\Team $teams
     */
    public function addTeam(Team $teams)
    {
        $this->teams[] = $teams;
    }

    /**
     * Get teams
     *
     * @return Doctrine\Common\Collections\Collection 
     */
    public function getTeams()
    {
         return $this->teams;
    }
}

团队实体：

namespace Tennisconnect\DashboardBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\Common\Collections\ArrayCollection;
use Tennisconnect\UserBundle\Entity\User;
use Tennisconnect\DashboardBundle\Entity\Challenge;
use Tennisconnect\DashboardBundle\Entity\Match;

/**
* @ORM\Entity
* @ORM\Table(name="team")
*/
class Team
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\ManyToMany(targetEntity="Tennisconnect\UserBundle\Entity\User",     mappedBy="teams")
     */
    protected $players;

     /**
     * @ORM\ManyToMany(targetEntity="challenge", inversedBy="teams", cascade=     {"persist"})
     */
    protected $challenges;

    /**
     * @ORM\ManyToMany(targetEntity="Match", inversedBy="teams")
     */
    protected $matches;

    public function __construct()
    {
        $this->players = new ArrayCollection();
    }

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Add players
     *
     * @param Tennisconnect\UserBundle\Entity\User $players
     */
    public function addUser(User $players)
    {
        $this->players[] = $players;
    }

    /**
     * Get players
     *
     * @return Doctrine\Common\Collections\Collection 
     */
    public function getPlayers()
    {
        return $this->players;
    }

    /**
     * Add matches
     *
     * @param Tennisconnect\DashboardBundle\Entity\Match $matches
     */
    public function addMatch(Match $matches)
    {
        $this->matches[] = $matches;
    }

    /**
     * Get matches
     *
     * @return Doctrine\Common\Collections\Collection 
     */
    public function getMatches()
    {
        return $this->matches;
    }

    /**
     * Add challenges
     *
     * @param Tennisconnect\DashboardBundle\Entity\challenge $challenges
     */
    public function addchallenge(challenge $challenges)
    {
        $this->challenges[] = $challenges;
    }

    /**
     * Get challenges
     *
     * @return Doctrine\Common\Collections\Collection 
     */
    public function getChallenges()
    {
        return $this->challenges;
    }
}

挑战控制器：

class ChallengeController extends Controller
{
    public function newAction()
    {
        $challenge = new Challenge();
        $form = $this->createForm(new ChallengeType(), $challenge);

        return $this->render('TennisconnectDashboardBundle:Challenge:new.html.twig', array('form' => $form->createView()));
    }
}

Answer 1

您已经创建了显示ManyToMany集合的表单；将multiple这些小部件的表单构建器中的选项设置为true（默认为 false，这从根本上与ToMany关系冲突）。

Answer 2

问题已经解决了。我必须将“allow_add”选项添加到 ChallengeType 类中的集合中。

挑战控制器类也需要一些编辑。在将挑战对象传递到表单之前，我向挑战对象添加了 2 支球队。