[Deprecated] DMZ 1.5.3 (DataMapper OverZealous Edition)

[eluser]demogar[/eluser]
I think I'm doing something wrong, but I can't get it working.

I want to register a user ONLY when the user submits but it happens inmediatelly I access the page.. and the validation is not working at all.

Controller:

Code:

function create()
    {
        // Loader
        $this->load->helper('form');
        #---
        
        # Header
        $header = array(
                'title'        =>    'Create user',
                'description'    =>    'bla bla'
            );
        $this->load->view('header.html', $header);
        
        # Body
        $this->load->view('user/create.html');
        
        # Footer
        $this->load->view('footer.html');
        
        if ($this->input->post('username') !== FALSE):
            
            #
            $u = new User();
            
            $u->username    = $this->input->post('username');
            $u->name    = $this->input->post('name');
            $u->lastname    = $this->input->post('lastname');
            $u->email    = $this->input->post('emnail');
            $u->password    = $this->input->post('password');
            $u->password2    = $this->input->post('password2');
            $u->user_type    = $this->input->post('user_type');
            
            if ($u->save()) {
                echo 'user registered';
            } else {
                echo '<h3>Error...</h3>';
                echo '<p>' . $user->error_string . '</p>';
            }
        endif;
    }

Model:

Code:

class User extends DataMapper
{

    var $validate = array(
            'username'    => array(
            'label'    => 'Nick',
            'rules'    => array('required', 'trim', 'unique', 'alpha_dash', 'min_length' => 3, 'max_length' => 20)
        ),
            'name'        => array(
                'label'    => 'Name',
                'rules'    => array('required', 'trim')
            ),
            'lastname'    => array(
                'label'    => 'Lastname',
                'rules'    => array('required', 'trim')
            ),
            'email'    => array(
                'label'    => 'E-mail',
                'rules'    => array('required', 'trim', 'valid_mail')
            ),
            'password'    => array(
                'label'    => 'Password',
                'rules'    => array('required', 'md5')
            ),
            'password2'    => array(
                'label'    => 'Password confirmation',
                'rules'    => array('required', 'matches' => 'password')
            ),
            'user_type'    => array(
                'label'    => 'User or admin?',
                'rules'    => array('required')
            )
        );
}

Any help is really appreciated. I'm new with this and I have around 1 hour trying to make it work... I know how to do this using the form_validation library and the AR from CI, but I'm getting some troubles with this with DMZ + its validation.

Thank you in advance