Sonata Admin Custom field with data transformer - symfony

Question

I have a easy form with a data transformer, it works correctly (update, persist and delete) but I get a error on twig.
Impossible to invoke a method ("trans") on a NULL variable ("") in SonataDoctrineORMAdminBundle:CRUD:edit_orm_one_to_many.html.twig at line 30
error is in this line:
{{ nested_field.vars['sonata_admin'].admin.trans(nested_field.vars.label) }}
All fields have value in nested_field.vars['sonata_admin'] less my custom field
My code is this:
$formMapper
->add(
$formMapper->create('articleAmount', 'text')
->addModelTransformer($articleAmountToStringTransformer)
)
...
Entities
/**
* AppShopHasArticles
*
* #ORM\Table(name="app_shop_has_articles")
* #ExclusionPolicy("all")
* #ORM\Entity(repositoryClass="Nvia\ShopAppBundle\Entity\Repository\AppShopHasArticlesRepository")
* #ORM\HasLifecycleCallbacks()
*/
class AppShopHasArticles
{
/**
* #var \Nvia\CommonBundle\Entity\Article
*
* #ORM\ManyToOne(targetEntity="Nvia\ShopAppBundle\Entity\Article", inversedBy="appShopHasArticles")
* #ORM\JoinColumn(name="article_id", referencedColumnName="id", nullable=false)
* #ORM\Id
* #Expose
*/
private $article;
/**
* #var \Nvia\CommonBundle\Entity\Country
*
* #ORM\ManyToOne(targetEntity="Nvia\CommonBundle\Entity\Country")
* #ORM\JoinColumn(name="country_id", referencedColumnName="id", nullable=false)
* #ORM\Id
* #Expose
*/
private $country;
/**
* #var \Nvia\ShopAppBundle\Entity\AppShop
*
* #ORM\ManyToOne(targetEntity="Nvia\ShopAppBundle\Entity\ArticleAmount")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="country_id", referencedColumnName="country_id", nullable=false),
* #ORM\JoinColumn(name="article_id", referencedColumnName="article_id", nullable=false)
* })
* #Expose
*/
private $articleAmount;
...
}
/**
* ArticleAmount
*
* #ORM\Table(name="article_amount")
*/
class ArticleAmount
{
/**
* #var \Nvia\CommonBundle\Entity\Article
*
* #ORM\ManyToOne(targetEntity="Nvia\ShopAppBundle\Entity\Article", inversedBy="articleAmounts")
* #ORM\JoinColumn(name="article_id", referencedColumnName="id", nullable=false)
* #ORM\Id
*/
private $article;
/**
* #var \Nvia\CommonBundle\Entity\Country
*
* #ORM\ManyToOne(targetEntity="Nvia\CommonBundle\Entity\Country")
* #ORM\JoinColumn(name="country_id", referencedColumnName="id", nullable=false)
* #ORM\Id
*/
private $country;
/**
* #var float
*
* #ORM\Column(name="amount", type="float", precision=10, scale=0, nullable=false)
* #Expose
*/
private $amount;
/**
* #var \DateTime
*
* #ORM\Column(name="created_at", type="datetime", nullable=false)
*/
private $createdAt;
}
What am I doing wrong :/ ?

Answer 1

When using the create method of the formMapper sonata will not insert it's own logic.
Instead try something like this
$formMapper
->add('articleAmount', 'text')
->get('articleAmount')
->addModelTransformer($articleAmountToStringTransformer)
Tested on Sonata 2.4