[DDC-1397] Accesing a OneToMany relation with Child Classes and OneToOne relations. Created: 29/Sep/11  Updated: 15/Oct/11  Resolved: 15/Oct/11

Status: Resolved
Project: Doctrine 2 - ORM
Component/s: ORM
Affects Version/s: 2.1, 2.1.1, 2.1.2
Fix Version/s: 2.1.2
Security Level: All

Type: Bug Priority: Major
Reporter: Gabriel Brunacci Assignee: Benjamin Eberlei
Resolution: Invalid Votes: 0
Labels: None
Environment:

Ubuntu 10.10 64bit
PHP 5.3.3
MySQL 5.1.49
Doctrine 2.1.2



 Description   

I am facing a small issue on Doctrine 2 that causes OneToOne relation needed to be part of the parent class. The error occurs when doing $content->getVersions() but not when doing $em->find("Model\Lantern\Content\Version", $id). The error message is:

Warning: Undefined index: summary in ORM/UnitOfWork.php:2012
Fatal error: Call to a member function setValue() on a non-object in ORM/UnitOfWork.php on line 2013

Error replication:

Simply by having a look at the model we can see what's causing the Bug, will avoid class annotations to make it simpler:

class Content{
    /**
    * @OneToMany(targetEntity="Version", mappedBy="content")
    */
    private $versions;
...
}

class Version{
    /**
     * @ManyToOne(targetEntity="Content", inversedBy="versions")
     * @JoinColumn(name="content_id", referencedColumnName="content_id")
     */
    private $content;
...
}

class Article extends Version{
    /** @OneToOne(targetEntity="Model\Lantern\Content\Fieldset\Summary", mappedBy="version", cascade={"persist", "delete"}) */
    private $summary;  
...
}

class Summary{
    /**
     * @OneToOne(targetEntity="Model\Lantern\Content\Version", inversedBy="summary")
     * @JoinColumn(name="version_id", referencedColumnName="version_id")
     */
    private $version;    
...
}

As you can see, Article::$summary targets Summary::$version, but Summary::$version targets Version::$summary. This in OOP is valid as Version is contained inside Article, so doing a downcasting will get Article::summary.

The reason I believe why using $em->find works is that $em->find already knows which child class is before doing map, and relations works fine.
On the other hand, when doing $content->getVersions(), Content::$versions targets Version, and looks like Doctrine does not resolve which child class it before mapping OneToOne relationshipg.

This bug doesn't occur with OneToMany or ManyToMany relationships.



 Comments   
Comment by Gabriel Brunacci [ 29/Sep/11 ]

A side but useful note: when I move @OneToOne relation to the parent class Version, The error doesn't happen.

Comment by Guilherme Blanco [ 04/Oct/11 ]

Should be the Summary::$version pointing to Article::$summary.

Your mapping is wrong conceptually in OOP, because you're referring a non-existing property of Version ($summary is only part of Article).
Please fix the issue and check out if the error still persist.

Comment by Benjamin Eberlei [ 15/Oct/11 ]

The mapping is wrong as guilherme said,

class Summary{
    /**
     * @OneToOne(targetEntity="Model\Lantern\Content\Article", inversedBy="summary")
     * @JoinColumn(name="version_id", referencedColumnName="version_id")
     */
    private $version;    
...
}
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