How to validate subforms of an entity-mapped form in Symfony2?

Question

I've got a form that is mapped to an entity ('data_class' => ...). I've got validators set up (via annotations) on the entity's properties.

The entity has a property (nameTranslations) of doctrine's type array. I created a custom field type composed of multiple fields that is assigned to this field in the form. Each of the subform's fields (of type text) has validators setup (NotBlank) via validation_constraint option.

I tried various validation annotations on the nameTranslations property, including Valid(). I tried settings error_bubbling on almost anything. The subform (field nameTranslations) doesn't get validated at all.

The subform:

class TranslatableTextType extends AbstractType
{
    private $langs;

    /**
    * {@inheritDoc}
    */
    public function __construct($multilang)
    {
        $this->langs = $multilang->getLangs();
    }

    /**
    * {@inheritDoc}
    */
    public function buildForm(FormBuilder $builder, array $options)
    {
        foreach($this->langs as $locale => $lang)
        {
            $builder->add($locale, 'text', array(
                'label' => sprintf("%s [%s]", $options['label'], $lang),
                'error_bubbling' => true,
            ));
        }
    }

    /**
    * {@inheritDoc}
    */
    public function getDefaultOptions(array $options)
    {
        $constraints = [
            'fields' => [],
            'allowExtraFields' => true,
            'allowMissingFields' => true,
        ];

        foreach($this->langs as $locale => $lang)
        {
            $constraints['fields'][$locale] = new NotBlank();
        }

        $collectionConstraint = new Collection($constraints);

        return [
            'validation_constraint' => $collectionConstraint,
            'label' => '',
            'error_bubbling' => true
        ];
    }

    /**
    * {@inheritDoc}
    */
    public function getParent(array $options)
    {
        return 'form';
    }

    /**
    * {@inheritDoc}
    */
    public function getName()
    {
        return 'translatable_text';
    }
}

In the main form:

$builder->add('nameTranslations', 'translatable_text', [
            'label' => 'Name'
        ]);

In the entity:

/**
 * @var array
 *
 * @Assert\Valid
 * @ORM\Column(type="array")
 */
protected $nameTranslations;

Answer 1

I think you should use collection type for that instead of custom one or your custom type should have collection type defined as parent.

You can use All validator like:

/**
 * @Assert\All({
 *     @Assert\NotBlank
 * })
 * @ORM\Column(type="array")
 */
 protected $nameTranslations;

it will check if each of array value is not blank.