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Message from discussion ManyToMany with extra field, limit results
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Jasper N. Brouwer  
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 More options Nov 7 2012, 11:25 am
From: "Jasper N. Brouwer" <jas...@nerdsweide.nl>
Date: Wed, 7 Nov 2012 17:25:21 +0100
Local: Wed, Nov 7 2012 11:25 am
Subject: Re: [doctrine-user] ManyToMany with extra field, limit results
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When joining 2 (or more) entities, you cannot limit on root-entities only. You will have to do this in 2 steps:

In your case I suspect you want to reduce the number of queries needed to get the results (I don't see a WHERE statement). You could do it this way:

$q = $em->createQuery( 'SELECT a.id FROM Articulo a ORDER BY a.fecha DESC' );
$q->setMaxResult( 10 );

$ids = $q->getArrayResult();

$q = $em->createQuery( 'SELECT a, au, u FROM Articulo a LEFT JOIN a.autores au JOIN au.usuario u WHERE a.id IN :ids ORDER BY a.fecha DESC' );
$q->setParameter( 'ids', $ids );

$result = $q->getResult();

PS: If you are doing this for pagination, take a look at http://docs.doctrine-project.org/en/latest/tutorials/pagination.html

--
Jasper N. Brouwer

On 07-11-2012, at 17:04, Guga <gustavobu...@gmail.com> wrote:

> Hi

> Is there someone what can help me? I have a ManyToMany relationship with extra fields, my schema is this one (I'm using Symfony2):

> Articulo -> articles
> ArticuloAutor -> Intermediate table, with extra fields
> Usuario -> users

> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Articulo:
> --------------------------------------------------------------------------- -----------------------
> /**
>  * @ORM\OneToMany(targetEntity="Gse\AppBundle\Entity\ArticuloAutor", mappedBy="articulo")
>  * @ORM\OrderBy({"orden" = "ASC"})
>  */
>  protected $autores;

>  public function __construct()
>  {
>      $this->autores = new ArrayCollection();
>             ....
>    }
> --------------------------------------------------------------------------- -----------------------

> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> ArticuloAutor:
> --------------------------------------------------------------------------- -----------------------
>     /**
>      * @ORM\Id
>      * @ORM\ManyToOne(targetEntity="Gse\AppBundle\Entity\Articulo", inversedBy="autores")
>      */
>     protected $articulo;

>     /**
>      * @ORM\Id
>      * @ORM\ManyToOne(targetEntity="Gse\AppBundle\Entity\Usuario")
>      */
>     protected $usuario;

>     // extras...

>     /**
>      * @var integer $orden
>      *
>      * @ORM\Column(type="integer", nullable=true)
>      */
>     private $orden;
> --------------------------------------------------------------------------- -------------------------

> If in my respository ArticuloRepository I do:

> $articulos =
>             $this->createQueryBuilder('a')
>             ->addSelect(array('u', 'au'))
>             ->leftJoin('a.autores', 'au')
>             ->innerJoin('au.usuario', 'u')
>             ->orderBy('a.fecha', 'DESC')
>             ->getQuery()
>             ->getResult();

> All is Perfect!! But, if I set a ->setMaxResult(10) (LIMIT 10), it return me 2 articles, with 5 authors each one, because, is applying the limit to all the registers, and not only to articles, any help?

> Thanks a lot, and sorry my english!


 
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