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Question

我有一个数据库，其中的表users具有以下字段： user_id, username, password ，...。 我也有一个具有player_name, player_position ，...和FK user_id的牌桌players 。 图片关系：

我从数据库中生成了实体，但现在我想从像$ user-> getPlayer（）这样的用户那里获取播放器。 教义并没有在“用户”实体中生成玩家，而是仅在“玩家”实体中生成用户。

这就是我现在所拥有的：

    /**
 * @var \VolleyScout\VolleyScoutBundle\Entity\Players
 *
 * @ORM\OneToOne(targetEntity="VolleyScout\VolleyScoutBundle\Entity\Players")
 * @JoinColumn(name="user_id", referencedColumnName="userId")
 */
private $player;

/**
 * Get player
 *
 * @return \VolleyScout\VolleyScoutBundle\Entity\Players
 */

public function getPlayer() {
    return $this->player;
}
/**
 * Set player
 *
 * @param \VolleyScout\VolleyScoutBundle\Entity\Players $player
 * @return Users
 */
public function setPlayer(\VolleyScout\VolleyScoutBundle\Entity\Players $player = null){
    $this->player = $player;

    return $this;
}

但是当我尝试$ user-> getPlayer（）时，我总是得到null。 （并且user_id在玩家表中）

更新：
我的玩家实体：

<?php

namespace VolleyScout\VolleyScoutBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Players
 *
 * @ORM\Table(name="players", indexes={@ORM\Index(name="fk_players_users1_idx", columns={"user_id"}), @ORM\Index(name="fk_players_teams1_idx", columns={"team_id"}), @ORM\Index(name="fk_players_myteam1_idx", columns={"myteam_id"})})
 * @ORM\Entity
 */
class Players
{
    /**
     * @var string
     *
     * @ORM\Column(name="player_name", type="string", length=255, nullable=false)
     */
    private $playerName;

    /**
     * @var string
     *
     * @ORM\Column(name="player_licensenumber", type="string", length=45, nullable=false)
     */
    private $playerLicensenumber;

    /**
     * @var string
     *
     * @ORM\Column(name="player_position", type="string", nullable=false)
     */
    private $playerPosition;

    /**
     * @var integer
     *
     * @ORM\Column(name="player_birthyear", type="integer", nullable=true)
     */
    private $playerBirthyear;

    /**
     * @var integer
     *
     * @ORM\Column(name="player_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $playerId;

    /**
     * @var \VolleyScout\VolleyScoutBundle\Entity\Myteam
     *
     * @ORM\ManyToOne(targetEntity="VolleyScout\VolleyScoutBundle\Entity\Myteam")
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="myteam_id", referencedColumnName="myteam_id")
     * })
     */
    private $myteam;

    /**
     * @var \VolleyScout\VolleyScoutBundle\Entity\Teams
     *
     * @ORM\ManyToOne(targetEntity="VolleyScout\VolleyScoutBundle\Entity\Teams")
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="team_id", referencedColumnName="team_id")
     * })
     */
    private $team;

    /**
     * @var \VolleyScout\VolleyScoutBundle\Entity\Users
     *
     * @ORM\ManyToOne(targetEntity="VolleyScout\VolleyScoutBundle\Entity\Users")
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="user_id", referencedColumnName="user_id")
     * })
     */
    private $user;



    /**
     * Set playerName
     *
     * @param string $playerName
     * @return Players
     */
    public function setPlayerName($playerName)
    {
        $this->playerName = $playerName;

        return $this;
    }

    /**
     * Get playerName
     *
     * @return string 
     */
    public function getPlayerName()
    {
        return $this->playerName;
    }

    /**
     * Set playerLicensenumber
     *
     * @param string $playerLicensenumber
     * @return Players
     */
    public function setPlayerLicensenumber($playerLicensenumber)
    {
        $this->playerLicensenumber = $playerLicensenumber;

        return $this;
    }

    /**
     * Get playerLicensenumber
     *
     * @return string 
     */
    public function getPlayerLicensenumber()
    {
        return $this->playerLicensenumber;
    }

    /**
     * Set playerPosition
     *
     * @param string $playerPosition
     * @return Players
     */
    public function setPlayerPosition($playerPosition)
    {
        $this->playerPosition = $playerPosition;

        return $this;
    }

    /**
     * Get playerPosition
     *
     * @return string 
     */
    public function getPlayerPosition()
    {
        return $this->playerPosition;
    }

    /**
     * Set playerBirthyear
     *
     * @param integer $playerBirthyear
     * @return Players
     */
    public function setPlayerBirthyear($playerBirthyear)
    {
        $this->playerBirthyear = $playerBirthyear;

        return $this;
    }

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

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

    /**
     * Set myteam
     *
     * @param \VolleyScout\VolleyScoutBundle\Entity\Myteam $myteam
     * @return Players
     */
    public function setMyteam(\VolleyScout\VolleyScoutBundle\Entity\Myteam $myteam = null)
    {
        $this->myteam = $myteam;

        return $this;
    }

    /**
     * Get myteam
     *
     * @return \VolleyScout\VolleyScoutBundle\Entity\Myteam 
     */
    public function getMyteam()
    {
        return $this->myteam;
    }

    /**
     * Set team
     *
     * @param \VolleyScout\VolleyScoutBundle\Entity\Teams $team
     * @return Players
     */
    public function setTeam(\VolleyScout\VolleyScoutBundle\Entity\Teams $team = null)
    {
        $this->team = $team;

        return $this;
    }

    /**
     * Get team
     *
     * @return \VolleyScout\VolleyScoutBundle\Entity\Teams 
     */
    public function getTeam()
    {
        return $this->team;
    }

    /**
     * Set user
     *
     * @param \VolleyScout\VolleyScoutBundle\Entity\Users $user
     * @return Players
     */
    public function setUser(\VolleyScout\VolleyScoutBundle\Entity\Users $user = null)
    {
        $this->user = $user;

        return $this;
    }

    /**
     * Get user
     *
     * @return \VolleyScout\VolleyScoutBundle\Entity\Users 
     */
    public function getUser()
    {
        return $this->user;
    }
}

更新2 ：在我的用户实体类中，我现在有：

 /**
 * @var \VolleyScout\VolleyScoutBundle\Entity\Players
 *
 * @ORM\OneToMany(targetEntity="VolleyScout\VolleyScoutBundle\Entity\Players")
 * @ORM\JoinColumns({
 *   @ORM\JoinColumn(name="user_id", referencedColumnName="user_id")
 * })
 */
private $player;

但这仍然行不通..

Answer 1

您的注释设置不正确（特别是JoinColumn）。 有趣的是您没有收到错误，但是无论如何...替换为：

/**
 * @var \VolleyScout\VolleyScoutBundle\Entity\Players
 *
 * @ORM\OneToOne(targetEntity="VolleyScout\VolleyScoutBundle\Entity\Players")
 * @JoinColumn(name="user_id", referencedColumnName="userId")
 */
private $player;

有了这个：

/**
 * @var \VolleyScout\VolleyScoutBundle\Entity\Players
 *
 * @ORM\OneToOne(targetEntity="VolleyScout\VolleyScoutBundle\Entity\Players")
 * @ORM\JoinColumn(name="user_id", referencedColumnName="user_id")
 */
private $player;

请注意，您的referencedColumnName应该是数据库中显示的名称，而不是Doxtrine实体。 首先修复这些错误，它应该可以解决问题。

UPDATE

您需要manyToOne关系，这是一个非常不同的设置。

/**
 * @var \VolleyScout\VolleyScoutBundle\Entity\Players
 *
 * @ORM\OneToMany(targetEntity="Players", mappedBy="user_id")
 */
private $players;

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

由于$players现在可以具有许多值，因此应将其设置为ArrayCollection 。 为了便于阅读，我还使变量$players代替了$player 。

你真的应该熟悉Symfony的文档，这是在描述非常清楚一个很简单的问题， Symfony的文档