Doctrine 2 - 实体通过密钥持有者表收集了另一个实体

Question

I want to implement this type of relationship:

Class SimpleUser must have a "languages" class property which should contain list of all SimpleLanguage-s that are binded to the current user in the UserLanguages table.

Please look at the classes:

public class SimpleUser {

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

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=50)
     */
    private $name;

    // what do I type here? I want to have SimpleLanguage[] here
    private $languages;
}

---

 public class SimpleLanguage {

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

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=50)
     */
    private $name;
}

---

 public class UserLanguages {

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


/**
 * @var integer
 * @ORM\Column(name="user_id", type="integer")
 */
private $userId;

/**
 * @var integer
 * @ORM\Column(name="language_id", type="integer")
 */
private $languageId;

/**
 * @var SimpleUser
 *
 * @ManyToOne(targetEntity="SimpleUser")
 * @JoinColumn(name="userId", referencedColumnName="id")
 */
private $user;

/**
 * @var SimpleLanguage
 *
 * @ManyToOne(targetEntity="SimpleLanguage")
 * @JoinColumn(name="languageId", referencedColumnName="id")
 */
private $language;
}

Answer 1

You are looking for a uni-directional one-to-many relationship with a join-table which is described in doctrine with the @ManyToMany annotation. This can lead to confusion.

You don't even need the glueing UserLanguages class at all ... doctrine will take care of the table for you.

<kbd>SimpleUser</kbd>

/**
 * @ORM\ManyToMany(targetEntity="SimpleLanguage", inversedBy="user")
 * @ORM\JoinTable(name="UserLanguages",
 *      joinColumns={@ORM\JoinColumn(name="user_id", referencedColumnName="id")},
 *      inverseJoinColumns={@ORM\JoinColumn(name="language_id", referencedColumnName="id", unique=true)}
 * )
 */
 protected $languages;

<kbd>SimpleLanguage</kbd>

/**
 * @ORM\ManyToMany(targetEntity="SimpleUser", mappedBy="languages")
 */
 protected $user;

now doctrine will create the UserLanguages table for you and keep the id's ( user_id , language_id ) in there.

Read more on association mappings with a join-table here.