创建关系的问题

Question

我无法让我的关系与doctrine2合作。

生成架构时出现以下错误消息：

"The table with name 'wasd.user_post' already exists."

我的问题是我不明白哪些关系导致出现此错误消息。

这些是我的实体：

发表：

<?php

use Doctrine\ORM\Mapping as ORM;

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

    /**
     * @ORM\Column(name="text", type="text")
     */
    private $text;

    /**
     * @ORM\Column(name="votes", type="integer")
     */
    private $votes = 0;

    /**
     * @ORM\ManyToOne(targetEntity="User", inversedBy="posts")
     */
    private $owner;

    /**
     * @ORM\ManyToMany(targetEntity="User", inversedBy="upvotedPosts")
     * @ORM\JoinTable(name="post_upvotes")
     */
    private $upvotedBy;

    /**
     * @ORM\ManyToMany(targetEntity="User", inversedBy="downvotedPosts")
     * @ORM\JoinTable(name="post_downvotes")
     */
    private $downvotedBy;

    /**
     * @ORM\OneToMany(targetEntity="Comment", mappedBy="post")
     */
    private $comments;

    /**
     * @ORM\OneToMany(targetEntity="Attachment", mappedBy="post")
     */
    private $attachments;

}

用户：

use FOS\UserBundle\Model\User as BaseUser;
use Doctrine\ORM\Mapping as ORM;

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

    /**
     * @ORM\Column(name="is_summoner_verified", type="boolean")
     */
    private $isSummonerVerified = false;

    /**
     * @ORM\Column(name="summoner_id", type="string", length=255)
     */
    private $summonerId = '';

    /**
     * @ORM\Column(name="summoner_name", type="string", length=255)
     */
    private $summonerName = '';

    /**
     * @ORM\Column(name="display_league", type="boolean")
     */
    private $displayLeague = true;

    /**
     * @ORM\Column(name="display_summoner", type="boolean")
     */
    private $displaySummoner = true;

    /**
     * @ORM\Column(name="league", type="string", length=255)
     */
    private $league = '';

    /**
     * @var $posts
     * @ORM\OneToMany(targetEntity="Post", mappedBy="owner")
     * @ORM\JoinColumn(name="owner_id")
     */
    private $posts;

    /**
     * @ORM\Column(name="summoner_verify_code", type="string", length=8)
     */
    private $summonerVerifyCode = '';

    /**
     * @ORM\ManyToMany(targetEntity="Post", inversedBy="upvotedBy")
     */
    private $upvotedPosts;

    /**
     * @ORM\ManyToMany(targetEntity="Post", inversedBy="downvotedBy")
     */
    private $downvotedPosts;

    /**
     * @ORM\ManyToMany(targetEntity="Comment", inversedBy="upvotedBy")
     */
    private $upvotedComments;

    /**
     * @ORM\ManyToMany(targetEntity="Comment", inversedBy="downvotedBy")
     */
    private $downvotedComments;

    /**
     * @ORM\OneToOne(targetEntity="Stream", mappedBy="user")
     */
    private $stream = null;

    /**
     * @ORM\OneToMany(targetEntity="Comment", mappedBy="user")
     */
    private $comments;

}