title: Phalcon Framework: Can't save not required strings in database
body: <p>I'm using the Phalcon framework for PHP, and I would like to save my form into the database, all is working how is supposed to, but I can't save empty strings in some (not required) fields.</p>
  
  <p>How can I save not required field? Every time I save not required fields without input, I get an error like "lastname field is required.".</p>
  
  <p>Anyone?</p>
  
  <p>Sorry, my English is not good, I'm learning...</p>
  
  <hr>
  
  <p>My controller code is:</p>
  
  <pre><code>$this-&gt;view-&gt;disable();
  $usuario = new Usuarios();
  
      $usuario-&gt;usuario = $this-&gt;request-&gt;getPost("usuario");
      $usuario-&gt;email = $this-&gt;request-&gt;getPost("email");
      $usuario-&gt;senha = $this-&gt;request-&gt;getPost("senha");
      $usuario-&gt;nome = $this-&gt;request-&gt;getPost("nome");
      $usuario-&gt;sobrenome = $this-&gt;request-&gt;getPost("sobrenome");
      $usuario-&gt;icone = $this-&gt;request-&gt;getPost("icone");
      $usuario-&gt;fixo = $this-&gt;request-&gt;getPost("fixo");
      $usuario-&gt;celular = $this-&gt;request-&gt;getPost("celular");
      $usuario-&gt;tipo = $this-&gt;request-&gt;getPost("tipo");
  
      $usuario-&gt;save();
  </code></pre>
  
  <p>And I have basic validations in my model...</p>