Join tables with Doctrine2 - zend-framework

Question

I'm trying to do a join between 2 tables, but I get this error:
Message: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
This is the code:
Page model
public function __construct()
{
$this->pages_meta = new \Doctrine\Common\Collections\ArrayCollection();
}
/**
* #var integer $id
* #Id #Column(type="integer")
* #GeneratedValue
*/
private $id;
/**
* #var integer $layout
* #Column(type="string")
*/
private $layout;
/**
* #var string $name
* #Column(type="string")
*/
private $name;
/**
* #var string $title
* #Column(type="string")
*/
private $title;
/**
* #var string $slug
* #Column(type="string")
*/
private $slug;
/**
* #var string $options
* #Column(type="integer")
*/
private $content_id;
/**
* #var integer $user_id
* #Column(type="integer")
*/
private $user_id;
/**
* #var string $created_at
* #Column(type="datetime")
*/
private $created_at;
/**
* #var string $language
* #Column(type="string")
*/
private $language;
/**
* #OneToMany(targetEntity="Default_Model_PageMeta", mappedBy="page_id")
* #JoinColumn(name="id", referencedColumnName="page_id")
*/
private $meta;
... (getters and setters)
PageMeta Model
/**
* #var integer $id
* #Id #Column(type="integer")
* #GeneratedValue
*/
private $id;
/**
* #var integer $page_id
* #Column(type="integer")
*/
private $page_id;
/**
* #var integer $key
* #Column(type="string")
*/
private $key;
/**
* #var integer $value
* #Column(type="string")
*/
private $value;
... (getters and setters)
The join Syntax
$doctrine = Zend_Registry::get('doctrine');
$request = Zend_Controller_Front::getInstance()->getRequest();
$qb = $doctrine->_em->createQueryBuilder()
->select('p, m')
->from('Default_Model_Page', 'p')
->join('p.meta', 'm');
$query = $qb->getQuery();
$page = $query->getResult();
Zend_Debug::dump($page); die;
Any idea what I'm doing wrong?
Thanks in advance!

Answer 1

It doesn't look like you have told Doctrine how to associate a Page model with a PageMeta model. I can guess that the foreign key in the table for PageMeta is page_id, but that doesn't appear anywhere in your annotations.
In the PageMeta model, try:
/**
* The page
*
* #var Default_Model_Page
* #OneToOne(targetEntity="Default_Model_Page")
* #JoinColumn(name="page_id", referencedColumnName="id")
*/
private $page;
Then in your query, you should be able to do:
$qb = $doctrine->_em->createQueryBuilder()
->select('p, m')
->from('Default_Model_PageMeta', 'm')
->join('m.page', 'p');
Not tested, but something like this should work.

Answer 2

Don't map the db columns you need for a relation as both #Column and #ManyToOne (or OneToOne), but always choose one. For most relations you'll want the association mappings (#ManyToOne, etc) and need to drop the #Column.
Doctrine will behave very erratic if you use both.
/**
* #Entity
*/
class Page
{
/**
* #OneToMany(targetEntity="PageMeta", mappedBy="page")
*/
private $meta;
public function __construct() {
$this->meta = new \Doctrine\Common\Collections\ArrayCollection();
}
}
/**
* #Entity
*/
class PageMeta
{
// Remove the property $page_id
/**
* #ManyToOne(targetEntity="Page", inversedBy="meta")
* #JoinColumn(name="page_id", referencedColumnName="id")
*/
private $page;
}
You can find more info on assiciations here.