Symfony2学说ManyToMany关系未调和

Question

I'm trying to create a ManyToMany relationship. Here's the code:

Article.php

namespace Heitor\ProjetoBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

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

    /**
     * @var string
     *
     * @ORM\Column(name="title", type="string", length=255)
     */
    protected $title;

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

    /**
     * @ORM\ManyToOne(targetEntity="Author", inversedBy="articles")
     */
    protected $author;

    /*
     * @ORM\ManyToMany(targetEntity="Tag", inversedBy="articles")
     * @ORM\JoinTable(name="articles_tags")
     */
    protected $tags;

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

    /**
     * Set title
     *
     * @param string $title
     * @return Article
     */
    public function setTitle($title)
    {
        $this->title = $title;

        return $this;
    }

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

    /**
     * Set text
     *
     *
     * @param string $text
     * @return Article
     */
    public function setText($text)
    {
        $this->text = $text;

        return $this;
    }

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

    /**
     * Set author
     *
     * @param \Heitor\ProjetoBundle\Entity\Author $author
     * @return Article
     */
    public function setAuthor(\Heitor\ProjetoBundle\Entity\Author $author = null)
    {
        $this->author = $author;

        return $this;
    }

    /**
     * Get author
     *
     * @return \Heitor\ProjetoBundle\Entity\Author 
     */
    public function getAuthor()
    {
        return $this->author;
    }
}

Tag.php

namespace Heitor\ProjetoBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

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

    /**
     * @var string
     *
     * @ORM\Column(name="description", type="string", length=255)
     */
    protected $description;

    /**
     * @ORM\ManyToMany(targetEntity="Article", mappedBy="tags")
     */
    protected $articles;

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->articles = new \Doctrine\Common\Collections\ArrayCollection();
    }

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

    /**
     * Set description
     *
     * @param string $description
     * @return Tag
     */
    public function setDescription($description)
    {
        $this->description = $description;

        return $this;
    }

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

    /**
     * Add articles
     *
     * @param \Heitor\ProjetoBundle\Entity\Article $articles
     * @return Tag
     */
    public function addArticle(\Heitor\ProjetoBundle\Entity\Article $articles)
    {
        $this->articles[] = $articles;

        return $this;
    }

    /**
     * Remove articles
     *
     * @param \Heitor\ProjetoBundle\Entity\Article $articles
     */
    public function removeArticle(\Heitor\ProjetoBundle\Entity\Article $articles)
    {
        $this->articles->removeElement($articles);
    }

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

The methods on each class were auto-generated via the command doctrine:generate:entites , I just did the attributes and mappings beforehand.

Then when I try to create the tables with doctrine:schema:update --dump-sql it doesn't try to create the articles_tags relationship:

CREATE TABLE Tag (id INT AUTO_INCREMENT NOT NULL, description VARCHAR(255) NOT NULL, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB;
CREATE TABLE Author (id INT AUTO_INCREMENT NOT NULL, name VARCHAR(255) NOT NULL, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB;
CREATE TABLE Article (id INT AUTO_INCREMENT NOT NULL, author_id INT DEFAULT NULL, title VARCHAR(255) NOT NULL, text LONGTEXT NOT NULL, INDEX IDX_CD8737FAF675F31B (author_id), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB;
ALTER TABLE Article ADD CONSTRAINT FK_CD8737FAF675F31B FOREIGN KEY (author_id) REFERENCES Author (id);

Why doesn't it try to create the addTag & etc. methods on Article.php? And why it doesn't try to create the ManyToMany joinTable?

Answer 1

Have you tried adding join columns? Maybe it helps.

/**
 * @ORM\ManyToMany(targetEntity="Tag", inversedBy="articles")
 * @ORM\JoinTable(name="articles_tags",
 *      joinColumns={@JoinColumn(name="tag_id", referencedColumnName="id")},
 *      inverseJoinColumns={@JoinColumn(name="article_id", referencedColumnName="id")}
 *      )
 */
 protected $tags;

Also, it seems you have added the tags later and forgot to call the generate entities again because I can't find getters and setters for tags in your code. Try to run the doctrine:generate:entites again.

Lastly, have you checked that your database doesn't already have that table present? (This shouldn't be possible, but it doesn't hurt to check if you don't have any other ideas.)