Reading PersistentCollections in Twig as if they were an Array

Question

I have a bidirectional one-to-many relationship between two classes (Protocol and History). While searching for a specific Protocol, I'm expected to see all History entries associated with that protocol.

While rendering my template, I pass the following:

return $this->render('FunarbeProtocoloAdminBundle:Protocolo:show.html.twig', array(
        'entity'      => $entity,
        'delete_form' => $deleteForm->createView(),
        'history' => $entity->getHistory(),
    )
);

entity->getHistory() returns a PersistentCollection instead of an array, which causes the following to render an error:

{% for hist in history %}
<tr>
    <td>{{ hist.dtOcorrencia|date('d/m/Y H:i') }}</td>
    <td>{{ hist.dtRetorno|date('d/m/Y H:i') }}</td>
</tr>
{% endfor %}

If instead of $entity->getHistory() I pass $em->getRepository('MyBundle:History')->findByProtocol($entity) , it works fine. But I figure the main point of having a bidirectional relationship was to avoid opening repositories and explicitly opening new resultsets.

Am I doing something wrong? How am I supposed to do that?

Answer 1

All I had to do was call the following on my TWIG:

{% for hist in entity.history %}

None of the other answers worked for me. I have to call the property directly in my twig instead of using its getter. Don't know why, but it worked.

Thanks.

Answer 2

Try this:

return $this->render('FunarbeProtocoloAdminBundle:Protocolo:show.html.twig'
    ,array(
          'entity'      => $entity,
         ,'delete_form' => $deleteForm->createView(),
         ,'history'     => $entity->getHistory()->toArray()
                                                ///////////
    )
);

Answer 3

Your code is fine, I always save myself the trouble and get my collections in the twig instead of passing it through my view. You could try this too.

Render code change

return $this->render('FunarbeProtocoloAdminBundle:Protocolo:show.html.twig', array(
        'entity'      => $entity,
        'delete_form' => $deleteForm->createView(),
    )
);

You want to access the history directly in your twig.

Twig

{% for hist in entity.getHistory() %}
    <tr>
        <td>{{ hist.dtOcorrencia|date('d/m/Y H:i') }}</td>
        <td>{{ hist.dtRetorno|date('d/m/Y H:i') }}</td>
    </tr>
{% endfor %}

If your result after the change is the same, try checking hist for an array, it could be nested! Persistent Collections tend to do that...

{% for history in entity.getHistory() %}
    {% for hist in history %}
        <tr>
            <td>{{ hist.dtOcorrencia|date('d/m/Y H:i') }}</td>
            <td>{{ hist.dtRetorno|date('d/m/Y H:i') }}</td>
        </tr>
    {% endfor %}
{% endfor %}