Symfony 2 - Access mapped Object property form twig - symfony

Question

I hava a entity with the following flied:
/**
* #ORM\ManyToOne(targetEntity="Document", inversedBy="posts")
* #ORM\JoinColumn(name="document_id", referencedColumnName="id")
*/
protected $image;
which I get with the following method:
public function indexAction() {
$posts = $this->getDoctrine()
->getRepository('airpaprcms2Bundle:Post')
->findByPageType(1);
if (!$posts) {
throw $this->createNotFoundException('No posts in Database!');
}
return $this->render('airpaprcms2Bundle:Default:index.html.twig', array('posts' => $posts));
}
How can I access a property of the mapped object form within twig? I tried post.image.file (the mapped entity Document has a property file)
{% for post in posts %}
<div>
<h1>
{{ post.title }}
</h1>
<p>{{ post.text }}</p>
<img src="{{ post.image.name }}" alt="{{ post.title }}" />
</div>
{% endfor %}
and get the following error message:
Item "file" for "" does not exist in airpaprcms2Bundle:Default:index.html.twig at line 11
What is the right syntax to access the mapped document property?

Answer 1

You can access the property of your linked entity with the following twig syntax:
{% for post in posts %}
{{ post.entityName.propertyName }}
{% endfor %}
In your case that would be:
{% for post in posts %}
{{ post.image.propertyName }}
{% endfor %}
Be sure to check that all post entities are linked to an image object. If one post entity has no link to an image, you will get a property not found error when trying to render your page.