Symfony/Doctrine - Twig_Error_Runtime: Catchable Fatal Error: Object of class Doctrine\ORM\PersistentCollection could not be converted to string

Question

I have this entity in my symfony project:

/**
 * Batiments
 *
 * @ORM\Table(name="batiments")
 * @ORM\Entity
 * @ORM\Entity(repositoryClass="MySpace\DatabaseBundle\Repository\BatimentsRepository")
 */
class Batiments
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer", nullable=false)
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

/**
     * @var string
     *
     * @ORM\Column(name="nom", type="string", length=150, nullable=true)
     */
    private $nom;

    /**
     * @ORM\ManyToOne(targetEntity="MySpace\DatabaseBundle\Entity\Ensembles")
     * @ORM\JoinColumn(nullable=false)
     */
    private $ensembles;

    /**
 * @ORM\ManyToMany(targetEntity="MySpace\DatabaseBundle\Entity\Typesactivite")
 * @ORM\JoinTable(name="batiments_typesactivite",
 *      joinColumns={@ORM\JoinColumn(name="batiments_id", referencedColumnName="id", nullable=false)},
 *      inverseJoinColumns={@ORM\JoinColumn(name="typesactivite_id", referencedColumnName="id", nullable=false)}
 *      )
 */
private $typesactivite;

//getters and setters

As you can see, I have a relation ManyToOne for the $ensembles and a ManyToMany relation for $typesactivite.

I have this SQL request:

SELECT b.referenceBatiment, b.nom, e.nom, p.nom, b.surfaceChauffee, ta.type
FROM `batiments` b, `ensembles` e, `parcsimmobilier` p, `typesactivite` ta, `batiments_typesactivite` bta
WHERE b.ensembles_id = e.id
AND e.parcsimmobilier_id = p.id
AND b.id = bta.batiments_id
AND ta.id = bta.typesactivite_id
GROUP BY p.nom, e.nom, b.nom, ta.type

On PhpMyAdmin the SQL request works very well, and so I have to import my SQl request in my Symfony Project (DQL with Doctrine).

I try this in my controller.php:

$query=$em->createQuery('SELECT b
                         FROM MySpaceDatabaseBundle:Ensembles e,  MySpaceDatabaseBundle:Typesactivite ta, MySpaceDatabaseBundle:Parcsimmobilier p, MySpaceDatabaseBundle:Batiments b
                         WHERE b.ensembles = e.id
                         AND b.typesactivite = ta.id');

It seems to work but just for the ManyToOne relation. I display the result in a <table> tag in html.twig like this:

<table id="dataTablesBatiments" class="table table-bordered table-hover" cellspacing="0" width="100%">
                <thead>
                  <tr>
                    <th>Référence</th>
                    <th>Parc</th>
                    <th>Nom</th>
                    <th>Ensemble</th>
                    <th>Type d'activité</th>
                    <th>Surface</th>
                    <th></th>
                  </tr>
                </thead>
                <tbody>
                  {% for batiments in batiment %}
                    <tr>
                      <td>{{ batiments.referencebatiment }}</td>
                      <td>{{ batiments.ensembles.parcsimmobilier }}</td>
                      <td>{{ batiments.nom }}</td>
                      <td>{{ batiments.ensembles }}</td>
                      <td>{{ batiments.typesactivite }}</td>
                      <td>{{ batiments.surfacechauffee }}</td>
                      <td><a href=""><button class="btn btn-warning btn-xs">Modifier</button></a></td>
                    </tr>
                  {% endfor %}
              </tbody>
            </table>

but I have this error:

[Semantical Error] line 0, col 328 near 'typesactivite': Error: Invalid PathExpression. StateFieldPathExpression or SingleValuedAssociationField expected.

---

LAST UPDATE

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With all the suggestion I try to do this according to doctrine reference documentation and Symfonybook. Here's the code in my controller after removing the query request:

$em=$this->getDoctrine()->getManager();
        $batiment = $em->getRepository('MySpaceDatabaseBundle:Batiments')->findAll();

        return $this->render('MySpaceGestionPatrimoinesBundle:Batiments:indexBatiments.html.twig', array('batiment' => $batiment ));
}

But this error occured now:

An exception has been thrown during the rendering of a template ("Catchable Fatal Error: Object of class Doctrine\ORM\PersistentCollection could not be converted to string in C:\wamp\www.........\app\cache\dev\twig\bf\66\146a31a62bf6f2a549d2604fb5be9c4530ab760a10169af08e8a5b72e9ee.php line 127") in MySpaceGestionPatrimoinesBundle:Batiments:indexBatiments.html.twig at line 60.

Like you can see, in my twig, all is right. Someone?

Thank you for the help.

Answer 1

It seems like I found the solution thanks to another developper (thank you again by the way).

Look at here: in fact you have to make a loop in your twig.

For it should be something like this in your code:

<tbody>
       {% for batiments in batiment %}
         <tr>
           <td>{{ batiments.referencebatiment }}</td>
           <td>{{ ... }}</td>
           <!-- your loop here -->
           <td>
             {% for batiments in batiments.typesactivite %}
               {{ batiments.type }}
             {% endfor %}
           </td>
        {% endfor %}
</tbody>

Hope It helps you.