Sonata Project: Can't access media that referenced to SonataPage - doctrine

Question

I have a Page entity, that has many-to-one association to Media entity from Sonata MediaBundle
<?xml version="1.0" encoding="utf-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
<entity
name="Application\Sonata\PageBundle\Entity\Page"
table="page__page"
>
<id name="id" type="integer" column="id">
<generator strategy="AUTO"/>
</id>
<field name="shortContent" type="text" column="short_content" nullable="true" />
<many-to-one field="media" target-entity="Application\Sonata\MediaBundle\Entity\Media">
<join-column name="media_id" />
</many-to-one>
<lifecycle-callbacks>
<lifecycle-callback type="postPersist" method="postPersist"/>
</lifecycle-callbacks>
</entity>
</doctrine-mapping>
When I'm logged as admin - all is right and I can access media in twig with {{ page.getMedia() }}
But, if I open this page in Incognito window, the media of the page will be
null
Any one have any ideas ?

Answer 1

I found a solution for this case.
If we are not logged in as admin we see a snapshot of some page, and when we add a new field into Page entity, snapshot creator didn't know nothing about this field, so we need to extend Sonata\PageBundle\Model\Transformer model
Page.orm.xml
<?xml version="1.0" encoding="utf-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
<entity
name="Application\Sonata\PageBundle\Entity\Page"
table="page__page"
>
<id name="id" type="integer" column="id">
<generator strategy="AUTO"/>
</id>
<field name="shortContent" type="text" column="short_content" nullable="true" />
<many-to-one field="media" target-entity="Application\Sonata\MediaBundle\Entity\Media">
<join-column name="media_id" />
</many-to-one>
<lifecycle-callbacks>
<lifecycle-callback type="postPersist" method="postPersist"/>
</lifecycle-callbacks>
</entity>
</doctrine-mapping>
Snapshot.orm.xml
<?xml version="1.0" encoding="utf-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
xmlns:gedmo="http://gediminasm.org/schemas/orm/doctrine-extensions-mapping"
xsi="http://www.w3.org/2001/XMLSchema-instance"
schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
<entity
name="Application\Sonata\PageBundle\Entity\Snapshot"
table="page__snapshot"
>
<id name="id" type="integer" column="id">
<generator strategy="AUTO"/>
</id>
<many-to-one field="media" target-entity="Application\Sonata\MediaBundle\Entity\Media">
<join-column name="media_id" />
</many-to-one>
<gedmo:loggable log-entry-class="Gedmo\Loggable\Entity\LogEntry"/>
</entity>
</doctrine-mapping>
And page to snapshot transformer class
PageTransformer.php
<?php
namespace Application\Sonata\PageBundle\Entity;
use Sonata\PageBundle\Entity\Transformer;
use Sonata\PageBundle\Model\PageInterface;
use Sonata\PageBundle\Model\SnapshotInterface;
class PageTransformer extends Transformer
{
public function create(PageInterface $page)
{
/** #var Snapshot $snapshot */
$snapshot = parent::create($page);
$content = $snapshot->getContent();
$snapshot->setContent($content);
$snapshot->setMedia($page->getMedia());
return $snapshot;
}
public function load(SnapshotInterface $snapshot)
{
$page = parent::load($snapshot);
$page->setMedia($snapshot->getMedia());
return $page;
}
}
Almost forget!!! We need to say Sonata to use our Transformer class
parameters.yml
parameters:
sonata.page.transformer.class: Application\Sonata\PageBundle\Entity\PageTransformer