Doctrine OneToOne 身份通过刷新时的外国实体异常

Please see code below – it works, but not the way I want. The php comments show what I want to achieve.

Test.php:

/**
 * It works, both saving and loading.
 * BUT, it requires that I create and save UserProfile 
 * in a separate step than saving User step.
 */

// create and save User
$user = new User();
$objectManager->persist($user);
$objectManager->flush();

// create and save UserProfile (this should be unnecessary)
$user->createProfile()
$objectManager->flush();

User.php:

use DoctrineORMMapping as ORM;

/**
 * @ORMEntity(repositoryClass="AppBundleEntityUserRepository")
 * @ORMTable(name="users")
 */
class User
{
    /**
     * @var int
     *
     * @ORMColumn(name="uid", type="integer")
     * @ORMId
     * @ORMGeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * It's NULL at first, I create it later (after saving User).
     * 
     * @var UserProfile|null
     *
     * @ORMOneToOne(targetEntity="UserProfile", mappedBy="user", cascade="persist")
     */
    private $profile = null;

    public function __construct()
    {
        // I want to create UserProfile inside User's constructor,
        // so that it is always present (never NULL):
        //$this->profile = new UserProfile($this);

        // but this would give me error:
        //
        // DoctrineORMORMInvalidArgumentException: 
        // The given entity of type 'AppBundleEntityUserProfile' 
        // (AppBundleEntityUserProfile@0000000058af220a0000000079dc875a)
        // has no identity/no id values set. It cannot be added to the identity map.
    }

    public function createProfile()
    {
        $this->profile = new UserProfile($this);
    }   
}

UserProfile.php:

use DoctrineORMMapping as ORM;

/**
 * @ORMEntity
 * @ORMTable(name="profiles")
 */
class UserProfile
{
    /**
     * – UserProfile's "uid" column points to User's "uid" column
     * – it is PK (primary key)
     * - it is FK (foreign key) as well
     * – "owning side"
     *
     * @var User
     *
     * @ORMId
     * @ORMOneToOne(targetEntity="User", inversedBy="profile")
     * @ORMJoinColumn(name="uid", referencedColumnName="uid", nullable=false)
    */
    private $user;

    public function __construct(User $user)
    {
        $this->user = $user;
    }    
}

测试应用:https://github.com/MacDada/DoctrineOneToOneTest

推荐答案

请记住，实际对象需要由E​​ntityManager保存.仅将类作为对另一个类的引用不会使 entityManager 意识到这两个类都存在.

<?php
$user = new User();
$myFirstComment = new Comment();
$user->addComment($myFirstComment);

$em->persist($user);
$em->persist($myFirstComment);
$em->flush();

$user = new User();
$profile = $user->getProfile();
$objectManager->persist($user);
$objectManager->persist($profile);
$objectManager->flush();