Question

I have an table Article that is in relationship with Steps (OneToMany) and Steps with Article ManyToOne.

I get Articles with:

$articles = $this->getDoctrine()
            ->getRepository("IftodiDesignBundle:Article")
            ->findAll();

And with foreach I want to show all Articles and Steps:

foreach($articles as $article)
    {
        $steps = $this->getDoctrine()
                ->getRepository("IftodiDesignBundle:Steps")
                ->createQueryBuilder('s')
                ->where('s.article = \''.$article.'\'')
                ->getQuery()
                ->execute();

        echo "<b>".$article->getTitle()."</b><br />";
        echo $article->getText()."<br />";
    }

I don’t know how to get data from table Steps usign the table Article and method getSteps() that is generated with Doctrine.

Please help me.

---

Thanks for the answer.

In table Article I have:

 /**
 * @ORM\OneToMany(targetEntity="Steps", mappedBy="Steps",cascade={"persist"})
 * @ORM\JoinColumn(name="id", referencedColumnName="id_article")
 */
protected $steps;

In table Steps:

/**
 * @ORM\ManyToOne(targetEntity="Article", inversedBy="steps")
 * 
 */
protected $article;

When I do:

 $articles = $this->getDoctrine()
            ->getRepository("IftodiDesignBundle:Article")
            ->findAll();

If I do:

foreach($articles as $article)
    {
        $steps = $article->getSteps();

I recieve error:

 Notice: Undefined index: Steps in /var/www/design/vendor/doctrine/lib/Doctrine/ORM/Persisters/BasicEntityPersister.php line 1280

---

If I do that:

    $articles = $this->getDoctrine()
            ->getRepository("IftodiDesignBundle:Article")
            ->findAll();
    foreach($articles as $article)
    {
        //Queries to DB
         $steps = $this->getDoctrine()
            ->getRepository("IftodiDesignBundle:Steps")
            ->findBy(array(
                "article"    => $article->getId()
            ));
         $media = $this->getDoctrine()
                 ->getRepository("IftodiDesignBundle:Media")
                 ->findBy(array(
                     "step" => $steps[0]->getId()
                 ));

I can obtain data that I need, but here are more interrogation to DB.

Answer 1

Delete @ORM\JoinColumn(name="id", referencedColumnName="id_article") from your annotation – doctrine will map your association into MySQL with sensible defaults.

Once you have deleted, regenerate your SQL: doctrine:schema:update --force

Furthermore if you are looping over your articles to get your steps, you are better off writing a custom method in your repository otherwise each time you call ->getSteps() Doctrine will make an SQL call (imagine looping over 100 articles – you would end up making 101 calls to the database!)

To avoid this you can put a method like so in your repository

public function all()
{
    $queryBuilder = $this->getEntityManager()->createQueryBuilder();

    $queryBuilder
        ->select('Article', 'Steps')
        ->from('IftodiDesignBundle:Article')
        ->leftJoin('Article.steps', 'Steps')
    ;

    // consider using ->getArrayResult() to use less memory
    return $queryBuilder->getQuery()->getResult(); 
}

I put together a few more best practices in a blog post