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    <h3>Edit :</h3> <p>I've just made a more complete answer on topic <a href="https://stackoverflow.com/questions/12911686/symfony-validate-form-with-mapped-false-form-fields/13086678#13086678">Symfony validate form with mapped false form fields</a></p> <h3>Original answer</h3> <p>Validating unbound (non mapped) field in a form is not well documented and the fast evolving form and validator components make the few examples obsoletes (for Symfony 2.1.2).</p> <p>For now I succeed in validated non mapped fields with event listener. Here is my simplified code :</p> <pre><code>namespace Dj\TestBundle\Form; use Symfony\Component\Form\AbstractType; use Symfony\Component\Form\FormBuilderInterface; use Symfony\Component\OptionsResolver\OptionsResolverInterface; use Symfony\Component\Form\FormEvents; use Dj\TestBundle\Form\EventListener\NewPostListener; class PostType extends AbstractType { public function buildForm(FormBuilderInterface $builder, array $options) { $builder-&gt;add('lineNumber', 'choice', array( 'label' =&gt; 'How many lines :', 'choices' =&gt; array( 3 =&gt; '3 lines', 6 =&gt; '6 lines' ), // 'data' =&gt; 3, // default value 'expanded' =&gt; true, 'mapped' =&gt; false )) -&gt;add('body', 'textarea', array( 'label' =&gt; 'Your text', 'max_length' =&gt; 120)); // this listener will validate form datas $listener = new NewPostListener; $builder-&gt;addEventListener(FormEvents::POST_BIND, array($listener, 'postBind')); } // ... other methods } </code></pre> <p>And the event listener :</p> <pre><code>namespace Dj\TestBundle\Form\EventListener; use Symfony\Component\Form\FormEvent; use Symfony\Component\Form\FormError; /** * listener used at Post creation time to validate non mapped fields */ class NewPostListener { /** * Validates lineNumber and body length * @param \Symfony\Component\Form\FormEvent $event */ public function postBind(FormEvent $event) { $form = $event-&gt;getForm(); $data = $event-&gt;getData(); if (!isset($data-&gt;lineNumber)) { $msg = 'Please give a correct line number'; $form-&gt;get('lineNumber')-&gt;addError(new FormError($msg)); } // ... other validations } } </code></pre> <p>This is how I validate my non mapped fields until I find out how to do this with validators.</p>
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