文件上载中的错误消息自定义

Question

Using the guide http://symfony.com/doc/current/cookbook/doctrine/file_uploads.html i'm trying to customize error message, but i've a problem: variable errors is not defined, as we don't validate an entity and we are not calling $this->get('validator')->validate($entity) .

{% block field_errors %}
{% spaceless %}
    {# errors is undefined here #}
{% endspaceless %}
{% endblock field_errors %}

This is the sample code:

public function uploadAction()
{
    $document = new Document();
    $form = $this->createFormBuilder($document)
        ->add('name')
        ->add('file')
        ->getForm()
    ;

    if ($this->getRequest()->getMethod() === 'POST') {
        $form->bindRequest($this->getRequest());
        if ($form->isValid()) {
            $em = $this->getDoctrine()->getEntityManager();

            $em->persist($document);
            $em->flush();

            $this->redirect($this->generateUrl('...'));
        }
    }

    // Variable 'errors' is not assigned
    return array('form' => $form->createView());
}

Answer 1

Not sure I understand. If you are following the example then $document has validation rules on it which will be tested by $form->isValid(). {{ form_errors(form) }} should output any errors.

If it is just a template customization question then you need to test for the existence of errors before trying to process them:

{% block field_errors %}
{% spaceless %}
    {% if errors|length > 0 %}
    <span style="color:red">
        {% for error in errors %}
            {{ error.messageTemplate|trans(error.messageParameters, 'validators') }}<br />
        {% endfor %}
    {% endif %}
{% endspaceless %}
{% endblock field_errors %}