title: symfony2 - form validation fails: form is always valid
body: <p>I have these validation rules:</p>
  
  <pre><code>Cgboard\SignupBundle\Entity\SignupData
    properties:
      email:
        - NotBlank:~
        - MinLength:3       // not validating neither this nor the rest
      nickname:
        - NotBlank:~
      password:
        - NotBlank:~
      password_repeat:
        - NotBlank:~
  </code></pre>
  
  <p>My entity </p>
  
  <pre><code>&lt;?php
  namespace Cgboard\SignupBundle\Entity;
  
  
  class SignupData {
      public $email;
      public $nickname;
      public $password;
      public $password_repeat;
  } 
  </code></pre>
  
  <p>And my controller:</p>
  
  <pre><code>&lt;?php
  namespace Cgboard\SignupBundle\Controller\Frontend;
  
  use     Symfony\Component\HttpFoundation\Request;
  use     Symfony\Bundle\FrameworkBundle\Controller\Controller;
  
  class SignupController extends Controller
  {
          ...
  
          if($request-&gt;getMethod() === 'POST') {
              $form-&gt;bind($request);
              if($form-&gt;isValid()) {
                  $this-&gt;save($SignupData);
              } 
          }
  
           .....   
  }
  </code></pre>
  
  <p>Currently <code>$form-&gt;isValid()</code> always returns <code>true</code>.</p>