Doctrine/Symfony - I have some errors. Something wrong with my relations - php

Question

I always get an exception with my entities. I tried to play with them. I checked on google which relation is the most appropriate for my entities... But I couldn't find the best configuration.
I'm making a website where you can create some albums.
A user can have multiple albums.So I have an entity Album and I have inside a user property :
/**
* Album
*
* #ORM\Table(name="album")
* #ORM\Entity(repositoryClass="Moodress\Bundle\AlbumBundle\Entity\AlbumRepository")
*/
class Album
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
** #ORM\ManyToOne(targetEntity="Moodress\Bundle\UserBundle\Entity\User")
** #ORM\JoinColumn(nullable=false)
*/
private $user;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* #var \DateTime
*
* #ORM\Column(name="creationDate", type="datetime")
*/
private $creationDate;
/**
* #var \DateTime
*
* #ORM\Column(name="modificationDate", type="datetime")
*/
private $modificationDate;
/**
* #ORM\OneToMany(targetEntity="Moodress\Bundle\AlbumBundle\Entity\Picture", cascade={"persist"}, mappedBy="album")
*/
private $pictures;
/**
* Constructor
*/
public function __construct()
{
$this->creationDate = new \Datetime();
$this->modificationDate = new \Datetime();
}
// Get and set
}
However, When a user subscribe on the website, I create a default album called Upload that I want to keep in the user class.
This is what I tried to do :
/**
* User
*
* #ORM\Entity
* #ORM\Table(name="user")
*/
class User extends BaseUser
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\OneToOne(targetEntity="Moodress\Bundle\AlbumBundle\Entity\Album", cascade={"persist"})
*/
protected $albumUpload;
// Get and set
}
I have this error :
Undefined index: album in /Users/Sandro/sites/moodress-website/Symfony/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/BasicEntityPersister.php line 1608. This error appears directly when I serialize any entity that has a user object...

Answer 1

The error is caused by the association annotation of the $albumUpload property in the User class.
Doctrine assumes that you have a $album property in your Album entity when you use a #ORM\OneToOne(targetEntity="Moodress\Bundle\AlbumBundle\Entity\Album") association in your User entity.
Try
/**
** #ORM\ManyToOne(targetEntity="Moodress\Bundle\UserBundle\Entity\User", inversedBy="albums")
** #ORM\JoinColumn(nullable=false)
*/
private $user;
in your Album entity and
/**
* #ORM\OneToMany(targetEntity="Moodress\Bundle\AlbumBundle\Entity\Album", mappedBy="user", cascade={"persist"})
*/
protected $albums;
in your User entity. In addition please add $this->albums = new ArrayCollection() to User::__construct().
Now if you want to add and keep a default album for users you should implement this somewhere in your business logic. You could figure out a way to identify the default album in your collection of albums and prevent deletion especially for this item.
Hope this helps.

Answer 2

My error:
'Undefined index: album'
results from this annotation in the Album class.
/**
* #ORM\OneToMany(
* targetEntity="Moodress\Bundle\AlbumBundle\Entity\Picture",
* cascade={"persist"},
* mappedBy="album"
* )
*/
I have set mappedBy to album but there is no $album property in my Picture class.
I did add this to my Picture class and clear my cache.
/**
* #ORM\ManyToOne(
* targetEntity="Moodress\Bundle\AlbumBundle\Entity\Album",
* inversedBy="pictures"
* )
*/
protected $album;
It solved my problem